Middle Power Class-D Speaker Amplifiers Class-D Speaker Amplifier for Digital Input BD5451EFV No.11075EAT17 ●Description BD5451EFV is a Class D Speaker Amplifier designed for Flat-panel TVs in particular for space-saving and low-power consumption, delivers an output power of 15W+15W. This IC employs state-of-the-art Bipolar, CMOS, and DMOS (BCD) process technology that eliminates turn-on resistance in the output power stage and internal loss due to line resistances up to an ultimate level. With this technology, the IC can achieve high efficiency of 90% (15W+15W output with 8Ω load). In addition, the IC is packaged in a compact reverse heat radiation type power package to achieve low power consumption and low heat generation and eliminates necessity of external heat-sink up toｓ a total output power of 30W. This product satisfies both needs for drastic downsizing, low-profile structures and many function, high quality playback of sound system. ●Features 1) This IC has one system of digital audio interface. 2 (I S format, SDATA: 16 / 20 / 24bit, LRCLK: 32kHz / 44.1kHz / 48kHz, BCLK: 64fs(fixed), MCLK: 256fs(fixed)) 2) Low supply current at RESET mode. 3) The decrease in sound quality because of the change of the power supply voltage is prevented with the feedback circuitry of the output. In addition, a low noise and low distortion are achieved. Eliminate large electrolytic-capacitors for high performance of Power Supply Rejection. 4) S/N of the system can be optimized by adjusting the gain setting among 2 steps. (20dB / 26dB) 5) Available for Monaural mode. 6) Within the wide range of the power supply voltage, it is possible to operate in a single power supply. (10～18V) 7) It contributes to miniaturizing, making to the thin type, and the power saving of the system by high efficiency and low heat. 8) Eliminates pop noise generated when the power supply goes on/off, or when the power supply is suddenly shut off. High quality muting performance is realized by using the soft-muting technology. 9) This IC is a highly reliable design to which it has various protection functions. (High temperature protection, under voltage protection, Output short protection, Output DC voltage protection and Clock stop protection, (MCLK, BCLK, LRCLK)) 10) Small package (HTSSOP-B28 package) contributes to reduction of PCB area. ●Applications Flat Panel TVs (LCD, Plasma), Home Audio, Desktop PC, Amusement equipments, Electronic Music equipments, etc. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 1/34 2011.06 - Rev.A Technical Note BD5451EFV ●Absolute maximum ratings (Ta=25℃) Parameter Symbol Ratings Unit Supply voltage VCC 22 V Pin 14, 15, 16, 27, 28 3.3 W ※3 Power dissipation Pd 4.7 W ※4 VIN -0.3 ～ 4.5 V Pin 1 ～ 6, 13 ※1 Terminal voltage 1 VPIN1 -0.3 ～ 7.0 V Pin 8, 11, 12 ※1 Terminal voltage 2 VPIN2 -0.3 ～ 4.5 V Pin 9 ※1 Terminal voltage 3 VPIN3 22 V Pin 17, 18, 20 ～ 23, 25, 26 ※1 Open-drain terminal voltage VERR -0.3 ～ 22 V Pin 10 Operating temperature range Topr -25 ～ +85 ℃ Storage temperature range Tstg -55 ～ +150 ℃ Maximum junction temperature Tjmax +150 ℃ Input voltage Parameter ※1 ※2 ※1 ※1 The voltage that can be applied reference to GND (Pin 7, 19, 24). ※2 Do not, however exceed Pd and Tjmax=150℃. ※3 70mm×70mm×1.6mm, FR4, 2-layer glass epoxy board (Copper on bottom layer : 70mm×70mm) Derating in done at 26.4mW/℃ for operating above Ta=25℃. There are thermal via on the board. ※4 70mm×70mm×1.6mm, FR4, 4-layer glass epoxy board (Copper on bottom layer : 70mm×70mm) Derating in done at 37.6mW/℃ for operating above Ta=25℃. There are thermal via on the board. ●Operating conditions (Ta=25℃) Parameter Symbol Ratings Unit Supply voltage VCC 10 ～ 18 V Minimum load impedance RL 3.6 Parameter Pin 14, 15, 16, 27, 28 ※1 ※2 VCC ≦ 18V ※5 VCC ≦ 16V ※5 Ω 3.2 ※5 Do not, however exceed Pd. ※ No radiation-proof design. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 2/34 2011.06 - Rev.A Technical Note BD5451EFV ●Electrical characteristics (Unless otherwise specified Ta=25℃, Vcc=12V, f=1kHz, RL=8Ω, RSTX=3.3V, MUTEX=3.3V, Gain=20dB, fs=48kHz Output LC filter: L=10µH, C=0.1µF) Limits Parameter Symbol Unit Conditions Min. Typ. Max. Total circuit Circuit current (Reset mode) Circuit current (Mute mode) Circuit current (Sampling mode) Open-drain terminal Low level voltage Pin 14, 15, 16, 27, 28, No load RSTX=0V, MUTEX=0V Pin 14, 15, 16, 27, 28, No load RSTX=3.3V, MUTEX=0V Pin 14, 15, 16, 27, 28, No load RSTX=3.3V, MUTEX=3.3V Pin 10, IO=0.5mA ICC1 - 0.1 0.2 mA ICC２ - 15 25 mA ICC3 - 50 80 mA VERR - - 0.8 V Regulator output voltage 1 VREG_G 4.7 5.0 5.3 V Pin 11 Regulator output voltage 2 VREG_3 3.0 3.3 3.6 V Pin 9 High level input voltage VIH 2.0 - 3.3 V Pin 1 ～ 6, 13 Low level input voltage VIL 0 - 0.9 V Pin 1 ～ 6, 13 Input current (Input pull-down terminal) IIH 50 66 95 μA Maximum output power 1 PO1 - 10 - W Maximum output power 2 PO２ - 15 - W GV20 19 20 21 GV26 25 26 THD - CT Pin 1 ～ 6, 13, VIN = 3.3V Speaker Output THD+n=10% GAIN=20dB VCC=15V, THD+n=10% GAIN =26dB ※6 dB PO=1W, Gain=20dB ※6 27 dB PO=1W, Gain=26dB ※6 0.07 - % PO=1W, BW=20～20kHz ※6 66 80 - dB PO=1W, BW=IHF-A ※6 PSRR - 70 - dB Vropple=1Vrms, f= 1kHz ※6 VNO - 100 200 μ Vrms -∞dBFS, BW=IHF-A ※6 fPWM1 - 256 - kHz fs=32kHz ※6 fPWM2 - 352.8 - kHz fs=44.1kHz ※6 fPWM3 - 384 - kHz fs=48kHz ※6 ※6 Voltage gain Total harmonic distortion Crosstalk PSRR Output noise voltage (Sampling mode) PWM sampling frequency ※6 These items show the typical performance of device and depend on board layout, parts, and power supply. The standard value is in mounting device and parts on surface of ROHM’s board directly. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 3/34 2011.06 - Rev.A Technical Note BD5451EFV ●Electrical characteristic curves (VCC=12V, Ta=25℃, RL=8Ω, Gain=26dB, fin=1kHz, fs=48kHz) Measured by ROHM designed 4 layer board. 80 0.20 RSTX=MUTEX=L RL=8Ω No signal 0.18 0.16 RSTX=H RL=8Ω No signal 70 MUTEX=H 60 0.14 50 ICC [mA] ICC [mA] 0.12 0.10 0.08 40 30 0.06 MUTEX=L 20 0.04 10 0.02 0.00 0 8 10 12 14 VCC [V] 16 18 20 8 RL=8Ω 90 14 VCC [V] 16 18 20 3.5 RL=4Ω RL=6Ω 3 RL=4Ω 80 2.5 70 RL=6Ω 60 ICC [A] EFFICIENCY [%] 12 Fig.2 Current consumption - Power supply voltage Fig.1 Current consumption - Power supply voltage 100 10 50 40 30 2 RL=8Ω 1.5 1 VCC=12V Gain=20dB fin=1KHz 20 10 VCC=12V Gain=20dB fin=1KHz 0.5 0 0 0 2 4 6 8 10 12 OUTPUT POWER [W/CH] 14 16 18 0 20 Fig.3 Efficiency - Output power 5ms/div Speaker output 2 6 8 10 12 OUTPUT POWER [W/CH] 14 16 18 20 Fig.4 Current consumption - Output power 5ms/div VCC=12V RL=8Ω Po=1W fin=500Hz Speaker output 2V/div VCC=12V RL=8Ω Po=1W fin=500Hz 2V/div MUTEX(2pin) MUTEX(2pin) 5V/div 5V/div Fig.5 Wave form when releasing soft-mute www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 4 Fig.6 Wave form when activating soft-mute 4/34 2011.06 - Rev.A Technical Note BD5451EFV ●Electrical characteristics (VCC=12V, Gain=26dB, fin=1kHz, fs=48kHz) Measured by ROHM designed 4 layer board. 25 3 THD+N=10% RL=8Ω 2.5 20 VCC=15V RL=8Ω 15 VCC=18V VCC=12V 2 ICC [A] OUTPUT POWER [W/CH] THD+N=1% 1.5 10 1 0.5 5 0 0 10 20 30 40 50 60 0 8 10 12 14 VCC [V] 16 18 TOTAL OUTPUT POWER [W] 20 Fig.7 Output power – Power supply voltage Fig.8 Current consumption - Output power 30 4 THD+N=10% RL=6Ω 25 THD+N=1% VCC=15V 3 20 VCC=12V 2.5 ICC [A ] OUTPUT POWER [W/CH] VCC=18V RL=6Ω 3.5 15 2 1.5 10 1 0.5 5 0 0 0 8 10 12 14 VCC [V] 16 18 10 20 Fig.9 Output power – Power supply voltage 20 30 40 TOTAL OUTPUT POWER [W] 50 60 Fig.10 Current consumption - Output power 40 5 THD+N=10% RL=4Ω 35 VCC=15V 4 30 THD+N=1% VCC=18V VCC=12V 3.5 25 3 IC C [A ] OUTPUT POWER [W/CH] 4.5 20 2.5 2 15 1.5 10 1 0.5 5 0 0 0 8 10 12 14 VCC [V] 16 18 20 Fig.11 Output power – Power supply voltage 10 20 30 40 TOTAL OUTPUT POWER [W] 50 60 Fig.12 Current consumption - Output power ※Dotted line means internal dissipation is over package power. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 5/34 2011.06 - Rev.A Technical Note BD5451EFV ●Electrical characteristic curves(VCC=12V, Ta=25℃, RL=8Ω, Gain=20dB, fin=1kHz, fs=48kHz) Measured by ROHM designed 4layer board. 30 0 -10 No signal -20 -40 24 VOLTAGE GAIN [dB] 26 -50 NOISE FFT [dBV] Po=1W 28 -30 -60 -70 -80 -90 22 20 18 -100 16 -110 14 -120 12 -130 -140 10 10 100 1k FREQUENCY [Hz] 10k 10 100k 100 1k FREQUENCY [Hz] 10k 100k Fig.14 Voltage gain - Frequency Fig.13 FFT of output noise voltage 100 100 BW=20~20KHz Po=1W BW=20~20KHZ 6KHZ THD+N [%] THD+N [%] 10 10 1KHZ 1 1 0.1 0.1 100HZ 0.01 0.01 0.1 1 10 100 0.01 10 OUTPUT POWER [W/CH] Fig.15 THD+N – Output power 1k FREQUENCY [Hz] 10k 100k Fig.16 THD+N – Frequency 0 0 -10 BW=20~20KHz Po=1W -10 BW=20~20KHZ -20 -20 -30 -30 CROSS-TALK [dB] CROSS-TALK[dB] 100 -40 -50 -60 -70 -40 -50 -60 -70 -80 -80 -90 -90 -100 -100 0.01 0.1 1 OUTPUT POWER [W/CH] 10 100 10 Fig.17 Crosstalk – Output power www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 100 1k FREQUENCY [Hz] 10k 100k Fig.18 Crosstalk – Frequency 6/34 2011.06 - Rev.A Technical Note BD5451EFV ●Electrical characteristic curves(VCC=12V, Ta=25℃, RL=6Ω, Gain=20dB, fin=1kHz, fs=48kHz) Measured by ROHM designed 4layer board 0 -10 30 No signal -20 28 -30 26 VOLTAGE GAIN [dB] -40 NOISE FFT [dBV] -50 -60 -70 -80 -90 -100 24 22 20 18 16 -110 14 -120 12 -130 Po=1W 10 -140 10 100 1k FREQUENCY [Hz] 10k 10 100k 100 1k 100 100 BW=20~20KHz Po=1W BW=20~20KHZ 10 6KHZ 1KHZ 1 THD+N [%] THD+N [%] 100k Fig.20 Voltage gain - Frequency Fig.19 FFT of output noise voltage 10 10k FREQUENCY [Hz] 1 0.1 0.1 100HZ 0.01 0.01 0.1 1 10 100 0.01 10 OUTPUT POWER [W/CH] Fig.21 THD+N – Output power 10k 100k 0 BW=20~20KHZ BW=20~20KHz Po=1W -10 -20 -20 -30 -30 CROSS-TALK [dB] CROSS-TALK [dB] 1k FREQUENCY [Hz] Fig.22 THD+N – Frequency 0 -10 -40 -50 -60 -40 -50 -60 -70 -70 -80 -80 -90 -100 0.01 100 -90 -100 0.1 1 OUTPUT POWER [W/CH] 10 100 10 Fig.23 Crosstalk – Output power www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 100 1k FREQUENCY [Hz] 10k 100k Fig.24 Crosstalk – Frequency 7/34 2011.06 - Rev.A Technical Note BD5451EFV ●Electrical characteristic curves(VCC=12V, Ta=25℃, RL=4Ω, Gain=20dB, fin=1kHz, fs=48kHz) Measured by ROHM designed 4layer board 30 0 -10 28 No signal -20 26 -40 24 VOLTAGE GAIN [dB] -30 NOISE FFT [dBV] -50 -60 -70 -80 -90 Po=1W 22 20 18 -100 16 -110 14 -120 12 -130 -140 10 10 100 1k FREQUENCY [Hz] 10k 10 100k 100 1k FREQUENCY [Hz] 100 100 BW=20~20KHz Po=1W BW=20~20KHZ THD+N [%] 100k Fig.26 Voltage gain - Frequency Fig.25 FFT of output noise voltage 10 10k 10 6KHZ THD+N [%] 1KHZ 1 0.1 1 0.1 100HZ 0.01 0.01 0.1 1 10 0.01 100 10 OUTPUT POWER [W/CH] Fig.27 THD+N – Output power 10k 100k 0 BW=20~20KHZ BW=20~20KHz Po=1W -10 -20 -20 -30 -30 CROSS-TALK [dB] CROSS-TALK [dB] 1k FREQUENCY [Hz] Fig.28 THD+N – Frequency 0 -10 -40 -50 -60 -40 -50 -60 -70 -70 -80 -80 -90 -100 0.01 100 -90 -100 0.1 1 OUTPUT POWER [W/CH] 10 100 10 Fig.29 Crosstalk – Output power www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 100 1k FREQUENCY [Hz] 10k 100k Fig.30 Crosstalk – Frequency 8/34 2011.06 - Rev.A Technical Note BD5451EFV ●Pin configuration and Block diagram RSTX 1 MUTEX 2 SDATA 3 LRCLK 4 BCLK 5 VCCP1 27 VCCP1 Driver FET 1P I2S I/F 6 GNDA 7 GNDA FILP 8 FILP ×8 Over Sampling Digital Filter 21 OUT2N Driver FET 2N REG_G Gain Selector VCCA 14 VCCA www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 20 OUT2N 19 GNDP2 GNDP2 Feedback GNDA GAIN 13 23 OUT1N 22 OUT1N Feedback FILA 24 GNDP1 GNDP1 PWM Modulator REG3 FILA 12 25 OUT1P Feedback ERROR 10 REG_G 11 26 OUT1P Feedback Driver FET 1N MCLK REG3 9 28 VCCP1 Control I/F 18 OUT2P Driver FET 2P Output Short Protection Output DC Voltage Protection Under Voltage Protection Over Voltage Protection Clock Stop Protection High Temperature Protection 9/34 17 OUT2P 16 VCCP2 VCCP2 15 VCCP2 2011.06 - Rev.A Technical Note BD5451EFV ●Pin function explanation (Provided pin voltages are typ. Values) Pin No. Pin name Pin voltage Pin explanation Internal equivalence circuit 14 1 RSTX 0V Reset pin for Digital circuit H: Reset OFF L: Reset ON 17.3k 1 32.7k 7 2 MUTEX 3 4 5 6 SDATA LRCLK BCLK MCLK 12 GAIN 7 GNDA Speaker output mute control pin H: Mute OFF L: Mute ON 0V 14 2, 3, 4 5, 6, 13 Digital audio signal input pin 50K 7 Gain setting terminal L: 20dB H: 26dB 0V GND pin for Analog signal － 14 Bias pin for PWM signal 8 FILP 1.75V~2.55V Please connect the capacitor. 8 7 14 Internal power supply pin for Digital circuit 9 REG3 3.3V Please connect the capacitor. 9 500 K 7 14 Error flag pin 10 ERROR 3.3V Please connect pull-up resister. 500 10 H: While Normal L: While Error 7 14 Internal power supply pin for Gate driver 11 REG_G 5.2V Please connect the capacitor. 11 500 K 7 www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 10/34 2011.06 - Rev.A Technical Note BD5451EFV Pin No. Pin name Pin voltage Pin explanation Internal equivalence circuit 14 50K Bias pin for PWM signal. 12 FILA 2.5V Please connect the capacitor. 12 50K 7 14 VCCA Vcc 15,16 VCCP2 Vcc 17,18 OUT2P Power supply pin for Analog signal Power supply pin for ch2 PWM signal Vcc～0V GNDP2 0V 20,21 OUT2N Vcc～0V 22,23 OUT1N Vcc～0V 24 GNDP1 0V 15,16 Please connect the capacitor. Output pin of ch2 positive PWM Please connect to Output LPF. 19 － GND pin for ch2 PWM signal 17,18 20,21 Output pin of ch2 negative PWM Please connect to Output LPF. 19 Output pin of ch1 negative PWM Please connect to Output LPF. GND pin for ch1 PWM signal Output pin of ch1 posotive PWM 25,26 OUT1P Vcc～0V 27,28 VCCP1 － 25,26 22,23 Please connect to Output LPF. Power supply pin for ch1 PWM signal www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 27,28 24 Please connect the capacitor. 11/34 2011.06 - Rev.A Technical Note BD5451EFV ●Terminal setting (1) Gain pin function GAIN (13pin) Speaker output gain L 20dB H 26dB (2) RSTX pin, MUTEX pin function RSTX (1pin) MUTEX (2pin) L Normalcy Error detecting PWM output (OUT1P, 1N, 2P, 2N) ERROR Output PWM output (OUT1P, 1N, 2P, 2N) ERROR Output L or H HiZ_L (Reset mode) H HiZ_L (Reset mode) H H L HiZ_L (MUTE ON) H HiZ_L (MUTE ON) L H H Normal operation (MUTE OFF) H HiZ_L (MUTE ON) L ※RSTX(1pin)terminal, MUTEX(2pin)terminal are internally pulled down by 50 kΩ(Typ.) ※With RSTX=L data of every register within IC (I2S / I/F part, ×8 over sampling digital filter part, latch circuit when detecting ERROR) becomes unnecessary. ●Input digital audio signal sampling frequency (fs) explanation PWM sampling frequency, Soft-start, Soft-mute time, and the detection time of the DC voltage protection in the speaker depends on sampling frequency (fs) of the digital audio input. Sampling frequency of the digital audio input (fs) PWM sampling frequency (fpwm) Soft-start / Soft-mute time DC voltage protection in the speaker detection time 32kHz 256kHz 32msec. 64msec. 44.1kHz 352.8kHz 23msec. 46msec. 48kHz 384kHz 21.5msec. 43msec. ●For voltage gain (Gain setting) BD5451EFV prescribe voltage gain at speaker output (BTL output) under the definition 0dBV (1Vrms) as full scale input of the digital audio input signal. For example, digital audio input signal = -20dBFS (0.1Vrms), Gain setting = 20dB, Load resistance RL = 8Ω will give speaker output (BTL output) amplitude as Vo=1Vrms. (Output power Po = Vo2/R = 0.125W ) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 12/34 2011.06 - Rev.A Technical Note BD5451EFV ●Format of digital audio input ・MCLK: It is System Clock input signal. It will input LRCLK, BCLK, SDATA that synchronizes with this clock that are 256 times of sampling frequency (256fs). ・LRCLK: It is L/R clock input signal. It corresponds to 32kHz / 44.1kHz / 48kHz with those clock (fs) that are same to the sampling frequency (fs) . The data of a left channel and a right channel for one sample is input to this section. ・BCLK: It is Bit Clock input signal. It is used for the latch of data in every one bit by sampling frequency’s 64 times sampling frequency (64fs). ・SDATA: It is Data input signal. It is amplitude data. The data length is different according to the resolution of the input digital audio data. It corresponds to 16/ 20/ 24 bit. 2 ●I S data format 1/64fs LRCLK Lch Rch BCLK SDATA MSB 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 LSB MSB 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 32 clocks LSB 32 clocks 2 Fig.31 I S Data Format 64fs, 24 bit Data Lch LRCLK Rch BCLK SDATA MSB 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 LSB MSB 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 LSB Fig.32 I2S Data Format 64fs, 20 bit Data Lch LRCLK Rch BCLK SDATA MSB 14 13 12 11 10 9 8 7 6 5 4 3 2 1 LSB MSB 14 13 12 11 10 9 8 7 6 5 4 3 2 1 LSB Fig.33 I2S Data Format 64fs, 16 bit Data The Low section of LRCLK becomes Lch, the High section of LRCLK becomes Rch. After changing LRCLK, second bit becomes MSB. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 13/34 2011.06 - Rev.A Technical Note BD5451EFV ●Audio Interface format and timing Recommended timing and operating conditions (MCLK, BCLK, LRCLK, SDATA) 1// f MCLK MCLK 1 / f LRCLK LRCLK 1/f BCLK BCLK Fig.34 Clock timing LRCLK tHD;LR tSU;LR BCLK tSU ; SD tHD ; SD SDATA Fig.35 Audio Interface timing (1) MCLK tHD ; BC tSU ; BC BCLK Fig.36 Audio Interface timing (2) Parameter Symbol Limit Min. Max. 8.192 12.288 Unit 1 MCLK frequency fMCLK MHz 2 LRCLK frequency fLRCLK 32 48 kHz 3 BCLK frequency fBCLK 2.048 3.072 MHz 4 Setup time, LRCLK※1 tSU;LR 20 － ns 5 Hold time, LRCLK※1 tHD;LR 20 － ns 6 Setup time, SDATA tSU;SD 20 － ns 7 Hold time, SDATA tHD;SD 20 － ns 8 Setup time, BCLK※2 tSU;BC 3 － ns 9 Hold time, BCLK※2 tHD;BC 7 － ns ※1 This regulation is to keep rising edge of LRCK and rising edge of BCLK from overlapping. ※2 This regulation is to keep rising edge of MCLK and rising edge of BCLK from overlapping. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 14/34 2011.06 - Rev.A Technical Note BD5451EFV ●Power supply start-up sequence VCCA (14pin) VCCP1 (15, 16pin) VCCP2 (27, 28pin) ①Power up VCCA, VCCP1, VCCP2 simultaneously. t REG_G (12pin) FILA (11pin) REG3 (9pin) FILP (8pin) REG_G REG_3 FILA FILP t With VCC＞10V, waiting time unnecessary. RSTX (1pin) ②Set RSTX to High after power up. t MCLK (6pin) BCLK (5pin) LRCLK (4pin) SDATA (3pin) ③Degital audio data communication. t With VCC＞10V, there are no problem sending digital audio data at RSTX=L.. MUTEX (2pin) about20msec ④After RSTX=L→H wait more than 20msec to MUTEX=L→H. t Soft-start 21.5msec(fs=48kHz) Speaker output t www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 15/34 2011.06 - Rev.A Technical Note BD5451EFV ●Power supply shut-down sequence ④Power down VCCA, VCCP1, VCCP2, simultaneously. VCCA (14pin) VCCP1 (15, 16pin) VCCP2 (27, 28pin) t REG_G (11pin) FILP (12pin) REG3 (9pin) FILA (8pin) REG_G REG_3 FILA FILP t RSTX (1pin) ③Set RSTX to Low t MCLK BCLK LRCLK SDATA (6pin) (5pin) (4pin) (3pin) ②After stopping speaker output, turn off the transmission of digital audio signal. t With VCC＞10V, there are no problem sending digital audio data even by RSTX=L. MUTEX (2pin) ①Set MUTEX to Low. about 50msec t Speaker output Soft-mute 21.5msec(fs=48kHz) t www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 16/34 2011.06 - Rev.A Technical Note BD5451EFV ●About the protection function PWM Output ERROR Output Detecting current = 10A (TYP.) HiZ_Low (Latch) L (Latch) PWM output Duty=0% or 100% 43msec(fs=48kHz) above fixed HiZ_Low (Latch) L (Latch) Chip temperature to be above 150℃ (TYP.) HiZ_Low Releasing Chip temperature to be below 120℃ (TYP.) condition Normal operation Detecting condition HiZ_Low Protection function Output short protection Detecting & Releasing condition Detecting condition DC voltage protection in Detecting the speaker condition High temperature protection Detecting condition H Power supply voltage to be below 8V (TYP.) Under voltage protection H Releasing Power supply voltage to be above 9V (TYP.) condition Normal operation Detecting condition Power supply voltage to be above 21.5V(TYP.) HiZ_Low Releasing Power supply voltage to be below 20.5V(TYP.) condition Normal operation Over voltage Protection H Detecting condition Clock stop protection No change to MCLK more than 1µsec (TYP.) or no change to BCLK more than 1µsec (TYP.) or no change to LRCLK more than 21µsec (at fs=48kHz.). Releasing Normal input to MCLK, BCLK and LRCLK. condition * * HiZ_Low H Normal operation The ERROR pin is Nch open-drain output. Once an IC is latched, the circuit is not released automatically even after an abnormal status is removed. The following procedures ① or ② is available for recovery. ①After turning MUTEX terminal to Low(holding time to Low = 10msec(Min.)) turn back to High again. ②Restore power supply after dropping to power supply voltage Vcc＜3V(10msec (Min.) holding) which internal power on reset circuit activates. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 17/34 2011.06 - Rev.A Technical Note BD5451EFV 1) Output short protection(Short to the power supply) This IC has the PWM output short protection circuit that stops the PWM output when the PWM output is short-circuited to the power supply due to abnormality. Detecting condition - It will detect when MUTEX pin is set High and the current that flows in the PWM output pin becomes 10A(TYP.) or more. The PWM output instantaneously enters the state of HiZ-Low if detected, and IC does the latch. Releasing method - ①After turning MUTEX terminal to Low(holding time to Low = 10msec(Min.)) turn back to High again. ②Restore power supply after dropping to power supply voltage Vcc＜3V(10msec (Min.) holding) which internal power on reset circuit activates. Short to VCC Release from short to VCC OUT1P (25,26 pin) OUT1N (22,23 pin) OUT2N (20,21 pin) OUT2P (17,18 pin) t Released from latch state . PWM out ：IC latches with HiZ-Low. Over current 10A(TYP .) t ERROR (10pin ) t 1µsec(TYP.) MUTEX(2pin) Latch release t 10msec(Min.) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 18/34 2011.06 - Rev.A Technical Note BD5451EFV 2) Output short protection(Short to GND) This IC has the PWM output short protection circuit that stops the PWM output when the PWM output is short-circuited to GND due to abnormality. Detecting condition - It will detect when MUTEX pin is set High and the current that flows in the PWM output terminal becomes 10A(TYP.) or more. The PWM output instantaneously enters the state of HiZ-Low if detected, and IC does the latch. Releasing method – ①After turning MUTEX terminal to Low(holding time to Low = 10msec(Min.)) turn back to High again. ②Restore power supply after dropping to power supply voltage Vcc＜3V(10msec (Min.) holding) which internal power on reset circuit activates. Release from short to GND Short to GND OUT1P (25,26pin) OUT1N (22,23pin) OUT2P (17,18pin) OUT2N (20,21pin) t PWM out ： IC latches with HiZ-Low. Released from latch state. Over current 10A(TYP.) t ERROR (10pin) t １μsec(TYP.) MUTEX(2pin) Latch release t １0msec(Min.) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 19/34 2011.06 - Rev.A Technical Note BD5451EFV 3) DC voltage protection in the speaker When the DC voltage in the speaker is impressed due to abnormality, this IC has the protection circuit where the speaker is defended from destruction. Detecting condition - It will detect when MUTEX pin is set High or Low and PWM output Duty=0% or 100% , 43msec(fs=48kHz) or above. Once detected, The PWM output instantaneously enters the state of HiZ-Low, and IC does the latch. Releasing method – ①After turning MUTEX terminal to Low(holding time to Low = 10msec(Min.)) turn back to High again. ②Restore power supply after dropping to power supply voltage Vcc＜3V(10msec (Min.) holding) which internal power on reset circuit activates. PWM out locked duty=100% abnormal state. OUT1P (25, 26pin) OUT1N (22, 23pin) OUT2P (17, 18pin) OUT2N (20, 21pin) Abnormal state release. PWM output ： IC latche with HiZ-Low. t Latch release state. Speaker output t Soft-start 21.5msec(fs=48kHz) ERROR (10pin) t MUTEX(2pin) Latch release t １0msec(Min.) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 20/34 2011.06 - Rev.A Technical Note BD5451EFV 4) High temperature protection This IC has the high temperature protection circuit that prevents thermal reckless driving under an abnormal state for the temperature of the chip to exceed Tjmax=150℃. Detecting condition - It will detect when MUTEX pin is set High and the temperature of the chip becomes 150℃(TYP.) or more. Speaker output turn MUTE immediately, when High temperature protection is detected. Releasing condition - It will release when MUTEX pin is set High and the temperature of the chip becomes 120℃ (TYP.) or less. The speaker output is outputted through a soft-start when released. Temperature of IC chip junction(℃) 150℃ 120℃ t OUT1P (25,26pin) OUT1N (22,23pin) OUT2P (17,18pin) OUT2N (20,21pin) HiZ-Low t Soft-start 21.5msec(fs=48KHz) Speaker output t ERROR (10pin) 3.3V t www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 21/34 2011.06 - Rev.A Technical Note BD5451EFV 5) Under voltage protection This IC has the under voltage protection circuit that make speaker output mute once detecting extreme drop of the power supply voltage. Detecting condition – It will detect when MUTEX pin is set High and the power supply voltage becomes lower than 8V.Speaker output turn MUTE immediately, when Under voltage protection is detected. Releasing condition – It will release when MUTEX pin is set High and the power supply voltage becomes more than 9V. The speaker output is outputted through a soft-start when released. VCCA (14pin) VCCP1 (15, 16pin) VCCP2 (27, 28pin) 9V 8V t OUT1P (25,26pin) OUT1N (22,23pin) OUT2P (17,18pin) OUT2N (20,21pin) HiZ-Low t Soft-start 21.5msec(fs=48KHz) Speaker output t ERROR (10pin) 3.3V t www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 22/34 2011.06 - Rev.A Technical Note BD5451EFV 6) Over voltage protection This IC has the under voltage protection circuit that make speaker output mute once detecting extreme drop of the power supply voltage. Detecting condition – It will detect when MUTEX pin is set High and the power supply voltage becomes more than 21.5V.Speaker output turn MUTE immediately, when over voltage protection is detected. Releasing condition – It will release when MUTEX pin is set High and the power supply voltage becomes lower than 20.5V. The speaker output is outputted through a soft-start when released. VCCA (14pin) VCCP1 (15, 16pin) VCCP2 (27, 28pin) 21V 19V t OUT1P (25,26pin) OUT1N (22,23pin) OUT2P (17,18pin) OUT2N (20,21pin) HiZ-Low t Soft-start 21.5msec(fs=48KHz) Speaker output t ERROR (10pin) 3.3V t www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 23/34 2011.06 - Rev.A Technical Note BD5451EFV 7-1) Clock stop protection(MCLK) This IC has the clock stop protection circuit that make the speaker output mute when the MCLK signal of the digital audio input stops. Detecting condition - It will detect when MUTEX pin is set High and the MCLK signal stops for about 1µsec or more. 21.5V. Speaker output turn MUTE immediately, clock stop protection is detected. Releasing condition - It will release when MUTEX pin is set High and the MCLK signal returns to the normal clock operation. The speaker output is outputted through a soft-start when released. Clock stop Clock recover MCLK (6pin) t Protection start with about 1µ clock stop. OUT1P (25,26pin) OUT1N (22,23pin) OUT2N (20,21pin) OUT2P (17,18pin) HiZ - Low t Soft - start 21.5msec (fs=48 kHz ) Speaker output t ERROR (10pin) 3.3V t www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 24/34 2011.06 - Rev.A Technical Note BD5451EFV 7-2) Clock stop protection(BCLK) This IC has the clock stop protection circuit that make the speaker output mute when the BCLK signal of the digital audio input stops. Detecting condition - It will detect when MUTEX pin is set High and the BCLK signal stops for about 1µsec or more. 21.5V.Speaker output turn MUTE immediately, when clock stop protection is detected. Releasing condition - It will release when MUTEX pin is set High and the BCLK signal returns to the normal clock operation. The speaker output is outputted through a soft-start when released. Clock recover Clock stop BCLK (5pin) t Protection start with about 1μ sec clock stop . OUT1P (25,26pin) OUT1N (22,23pin) OUT2N (20,21pin) OUT2P (17,18pin) HiZ - Low t Soft - start 21.5msec ( fs= 48kHz) Speaker output t ERROR(10pin) 3.3V t www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 25/34 2011.06 - Rev.A Technical Note BD5451EFV 7-3) Clock stop protection (LRCLK) This IC has the clock stop protection circuit that make the speaker output mute when the LRCLK signal of the digital audio input stops. Detecting condition - It will detect when MUTEX pin is set High and the LRCLK signal stops for about 21µsec (at fs=48kHz) or more. Speaker output turn MUTE immediately, when clock stop protection is detected. Releasing condition - It will release when MUTEX pin is set High and the LRCLK signal returns to the normal clock operation. The speaker output is outputted through a soft-start when released. Clock stop Clock recover LRCLK (4pin) t Protection start with about 21us (fs=48kHz) clock stop. OUT1P (25,26pin) OUT1N (22,23pin) OUT2P (17,18pin) OUT2N (20,21pin) HiZ-Low t Soft-start 21.5msec(fs=48kHz) Speaker output t ERROR (10pin) 3.3V t www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 26/34 2011.06 - Rev.A Technical Note BD5451EFV ●Application Circuit Example (Stereo BTL Output, RL=8Ω, VCC=10V～16V, Po=～15W) RSTX μ-con 1 MUTEX 2 0 SDATA 0 LRCLK Digital Audio Source 0 BCLK (NOP) 0 MCLK GNDA C8 0.1μF C9 0.1μF R10 100kΩ ERROR 27 Driver FET 1P 4 2 GNDA 8 FILP 9 ×8 Over Sampling Digital Filter 11 C12 0.1μF 12 23 21 Gain Selector 13 14 VCCA VCCA: 10V～16V C20 0.1μF GNDP2 C15 10μF GNDP2 18 Driver FET 2P FILA L20 10μH 19 Feedback REG_G SP 1ch (8Ω) 20 Feedback GNDA C23 0.1μF L23 10μH 22 Driver FET 2N 10 GNDP1 GNDP1 GNDP1 PWM Modulator REG3 C27 10μF 24 Driver FET 1N 7 C26 0.1μF 25 Feedback 6 L26 10μH 26 Feedback IS I/F 5 VCCP1: 10V～16V VCCP1 3 C11 0.1μF C14 10μF 28 Control I/F GNDP2 17 C17 0.1μF SP 2ch (8Ω) L17 10μH 16 Output Short Protection Output DC Voltage Protection VCCP2 15 Under Voltage Protection Over Voltage Protection Clock Stop Protection High Temperature Protection VCCP2: 10V～16V ●BOM list (Stereo BTL Output, RL=8Ω, VCC=10V～16V, Po=～15W) Parts Parts No. Value Company IC U1 － ROHM Product No. BD5451EFV Inductor L17, L20, L23, L26 10μH TOKO B1047DS-100M=3P Resistor R10 100kΩ ROHM MCR03EZPJ104 C14, C15, C27 10µF Capacitor C8, C9, C11, C12 0.1µF C17, C20, C23, C26 0.1µF MURATA Rated Voltage Tolerance Size － － 9.7mm×6.4mm - (±20%) 7.6mm×7.6mm 1/10W J(±1%) 1.6mm×0.8mm GRM31CB11E106KA75L 25V B(±10%) 3.2mm×1.6mm GRM188B11A104KA92D 10V B(±10%) 1.6mm×0.8mm GRM188B11E104KA01D 25V B(±10%) 1.6mm×0.8mm As return of current regenerated by back EMF of output coil happens, take steps such as putting capacitor between power supply and GND as a electric pathway for the regenerated current. Be sure that there is no problem with each property such as emptied capacity at lower temperature regarding electrolytic capacitor to decide capacity value. If the connected power supply does not have sufficient current absorption capacity, regenerative current will cause the voltage on the power supply line to rise, which combined with the product and its peripheral circuitry may exceed the absolute maximum ratings. It is recommended to implement a physical safety measure such as the insertion of a voltage clamp diode between the power supply and GND pins. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 27/34 2011.06 - Rev.A Technical Note BD5451EFV ●Application Circuit Example (Monaural BTL Output, RL=8Ω, VCC=10V～16V, Po=～15W) RSTX μ-con 1 MUTEX 2 0 SDATA 0 LRCLK Digital Audio Source 0 BCLK (NOP) 0 MCLK GNDA C8 0.1μF C9 0.1μF R10 100kΩ ERROR C11 0.1μF C12 0.1μF 27 3 4 2 GNDA 8 FILP 9 ×8 Over Sampling Digital Filter 23 12 GNDP1 19 Gain Selector 14 VCCA VCCA: 10V～16V GNDP2 18 Driver FET 2P FILA SP 1ch (8Ω) 20 Feedback REG_G C23 0.1μF 21 Feedback GNDA 11 GNDP1 L23 10μH 22 Driver FET 2N 10 GNDP1 GNDP1 PWM Modulator REG3 C27 10μF 24 Driver FET 1N 7 C26 0.1μF 25 Feedback 6 L26 10μH 26 Feedback IS I/F 5 VCCP1: 10V～16V VCCP1 Driver FET 1P 13 C14 10μF 28 Control I/F 17 16 Output Short Protection Output DC Voltage Protection VCCP2 15 Under Voltage Protection Over Voltage Protection Clock Stop Protection High Temperature Protection ●BOM list (Monaural BTL Output, RL=8Ω, VCC=10V～16V, Po=～15W) Parts Parts No. Value Company IC U1 － ROHM Product No. BD5451EFV Inductor L23, L26 10μH TOKO B1047DS-100M=3P Resistor R10 100kΩ ROHM MCR03EZPJ104 C14, C27 10µF Capacitor C8, C9, C11, C12 0.1µF C23, C26 0.1µF MURATA Rated Voltage Tolerance Size － － 9.7mm×6.4mm - (±20%) 7.6mm×7.6mm 1/10W F(±1%) 1.6mm×0.8mm GRM31CB11E106KA75L 25V B(±10%) 3.2mm×1.6mm GRM188B11A104KA92D 10V B(±10%) 1.6mm×0.8mm GRM188B11E104KA01D 25V B(±10%) 1.6mm×0.8mm As return of current regenerated by back EMF of output coil happens, take steps such as putting capacitor between power supply and GND as a electric pathway for the regenerated current. Be sure that there is no problem with each property such as emptied capacity at lower temperature regarding electrolytic capacitor to decide capacity value. If the connected power supply does not have sufficient current absorption capacity, regenerative current will cause the voltage on the power supply line to rise, which combined with the product and its peripheral circuitry may exceed the absolute maximum ratings. It is recommended to implement a physical safety measure such as the insertion of a voltage clamp diode between the power supply and GND pins. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 28/34 2011.06 - Rev.A Technical Note BD5451EFV ●Application Circuit Example (Stereo BTL Output, RL=8Ω, VCC=16V～18V, Po=～20W) ※To prevent going over absolute maximum rating by the leap out of power supply and the linking of PWM output wave form, please provide countermeasure shown below diagram (dot-line ※) when using at Vcc＞16V. RSTX μ-con 1 MUTEX 2 0 SDATA 0 LRCLK Digital Audio Source 0 BCLK (NOP) 0 MCLK GNDA C8 0.1μF C9 0.1μF R10 100kΩ ERROR C11 0.1μF C12 0.1μF 27 3 4 2 25 Feedback 7 GNDA 8 FILP 9 REG3 ×8 Over Sampling Digital Filter 11 12 Gain Selector VCCA L23 GND L20 C20B 680pF GNDP2 19 SP 1ch (8Ω) 10μH C15 10μF GNDP2 17 R17 6.8Ω GNDP2 C17B 680pF L17 ※ 10μH C20 0.1μF R20 6.8Ω GNDP2 18 C23 0.1μF C14B 220μF 20 Driver FET 2P FILA GNDP1 C23B 680pF VCC: 16V～18V 21 Feedback REG_G GNDP1 ※ Feedback GNDA R23 6.8Ω GNDP1 22 Driver FET 2N 10μH C26 0.1μF R26 6.8Ω C27 10μF 23 PWM Modulator 10 C26B 680pF 24 GNDP1 Driver FET 1N 6 L26 ※ 26 Feedback IS I/F 5 14 ●BOM list VCCP1 Driver FET 1P 13 C14 10μF 28 Control I/F C17 0.1μF SP 2ch (8Ω) 10μH 16 Output Short Protection Output DC Voltage Protection VCCP2 15 Under Voltage Protection Over Voltage Protection Clock Stop Protection High Temperature Protection (Stereo BTL Output, RL=8Ω, VCC=16V～18V, Po=～20W) Parts Parts No. Value Company IC U1 － ROHM BD5451EFV Inductor L17, L20, L23, L26 10μH TOKO B1047DS-100M=3P R10 100kΩ ROHM MCR03EZPJ104 R17, R20, R23, R26 6.8Ω ROHM MCR03EZPFL6R80 Resistor Capacitor Electrolytic Capacitor Product No. Rated Voltage Tolerance Size － － 9.7mm×6.4mm - (±20%) 7.6mm×7.6mm 1/10W J(±5%) 1.6mm×0.8mm 1/10W F(±1%) 1.6mm×0.8mm C14, C15, C27 10µF GRM31CB11E106KA75L 25V B(±10%) 3.2mm×1.6mm C8, C9, C11, C12 0.1µF GRM188B11A104KA92D 10V B(±10%) 1.6mm×0.8mm C17, C20, C23, C26 0.1µF GRM188B11E104KA01D 25V B(±10%) 1.6mm×0.8mm C17,B C20B, C23B, C26B 680pF GRM188B11E681KA01 25V B(±10%) 1.6mm×0.8mm C14B 220μF ECA1EMH221 25V ±20% φ8mm×11.5mm MURATA Panasonic As return of current regenerated by back EMF of output coil happens, take steps such as putting capacitor between power supply and GND as a electric pathway for the regenerated current. Be sure that there is no problem with each property such as emptied capacity at lower temperature regarding electrolytic capacitor to decide capacity value. If the connected power supply does not have sufficient current absorption capacity, regenerative current will cause the voltage on the power supply line to rise, which combined with the product and its peripheral circuitry may exceed the absolute maximum ratings. It is recommended to implement a physical safety measure such as the insertion of a voltage clamp diode between the power supply and GND pins. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 29/34 2011.06 - Rev.A Technical Note BD5451EFV ●Application Circuit Example (Monaural BTL Output, RL=8Ω, VCC=16V～18V, Po=～20W) ※To prevent going over absolute maximum rating by the leap out of power supply and the linking of PWM output wave form, please provide countermeasure shown below diagram (dot-line ※) when using at Vcc＞16V. RSTX μ-con 1 MUTEX 2 0 SDATA 0 MCLK C8 0.1μF C9 0.1μF R10 100kΩ ERROR C11 0.1μF C12 0.1μF 2 7 GNDA 8 FILP 9 REG3 ×8 Over Sampling Digital Filter GNDP1 12 L23 10μH 22 VCC: 16V～18V 21 C14B 220μF GNDP1 GNDP2 18 17 VCCP2 15 Under Voltage Protection Over Voltage Protection Clock Stop Protection High Temperature Protection VCCA SP 1ch (8Ω) 16 Output Short Protection Output DC Voltage Protection 14 C23 0.1μF 19 Driver FET 2P Gain Selector GNDP1 C23B 680pF GND Feedback FILA GNDP1 20 Feedback REG_G R23 6.8Ω GNDP1 ※ Driver FET 2N GNDA 11 C26 0.1μF R26 6.8Ω C27 10μF 23 PWM Modulator 10 L26 10μH C26B 680pF 24 Driver FET 1N 13 ●BOM list 25 Feedback 6 C14 10μF ※ 26 Feedback IS I/F 5 (NOP) GNDA 27 Driver FET 1P 4 BCLK 0 VCCP1 3 0 LRCLK Digital Audio Source 28 Control I/F (Monaural BTL Output, RL=8Ω, VCC=16V～18V, Po=～20W) Parts Parts No. Value Company IC U1 － ROHM Inductor L23, L26 10μH TOKO Resistor Capacitor Electrolytic Capacitor R10 100kΩ R23, R26 6.8Ω C14, C27 10µF C8, C9, C11, C12 0.1µF C23, C26 0.1µF C23B, C26B 680pF C14B 220μF ROHM MURATA Panasonic Rated Voltage Tolerance Size BD5451EFV － － 9.7mm×6.4mm B1047DS-100M=P3 - (±20%) 7.6mm×7.6mm Product No. MCR03EZPJ104 1/10W J(±5%) 1.6mm×0.8mm MCR03EZPFL6R80 1/10W F(±1%) 1.6mm×0.8mm GRM31CB31E106KA75L 25V B(±10%) 3.2mm×1.6mm GRM188B11A104KA92D 10V B(±10%) 1.6mm×0.8mm GRM188B11E104KA01D 25V B(±10%) 1.6mm×0.8mm GRM188B11E681KA01 25V B(±10%) 1.6mm×0.8mm ECA1EMH221 25V ±20% φ8mm×11.5mm As return of current regenerated by back EMF of output coil happens, take steps such as putting capacitor between power supply and GND as a electric pathway for the regenerated current. Be sure that there is no problem with each property such as emptied capacity at lower temperature regarding electrolytic capacitor to decide capacity value. If the connected power supply does not have sufficient current absorption capacity, regenerative current will cause the voltage on the power supply line to rise, which combined with the product and its peripheral circuitry may exceed the absolute maximum ratings. It is recommended to implement a physical safety measure such as the insertion of a voltage clamp diode between the power supply and GND pins. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 30/34 2011.06 - Rev.A Technical Note BD5451EFV ●Output LC Filter Circuit An output filter is required to eliminate radio-frequency components exceeding the audio-frequency region supplied to a load (speaker). Because this IC uses sampling clock frequencies from 256kHz (fs=32kHz) to 384kHz (fs=48kHz) in the output PWM signals, the high-frequency components must be appropriately removed. This section takes an example of an LC type LPF shown below, in which coil L and capacitor C compose a differential filter with an attenuation property of -12dB / oct. A large part of switching currents flow to capacitor C, and only a small part of the currents flow to speaker RL. This filter reduces unwanted emission this way. In addition, coil L and capacitor Cg compose a filter against in-phase components, reducing unwanted emission further. L 25,26 or 17,18 C C 22,23 or 20,21 RL L Following presents output LC filter constants with typical load impedances. RL L C 4Ω 10µH 0.47µF 6Ω 10µH 0.15µF 8Ω 10µH 0.1µF Use coils with a low direct-current resistance and with a sufficient margin of allowable currents. A high direct-current resistance causes power losses. In addition, select a closed magnetic circuit type product in normal cases to prevent unwanted emission. Use capacitors with a low equivalent series resistance, and good impedance characteristics at high frequency ranges (100kHz or higher). Also, select an item with sufficient withstand voltage because flowing massive amount of high-frequency currents is expected. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 31/34 2011.06 - Rev.A Technical Note BD5451EFV ●Notes for use 1 ) Absolute maximum ratings Use of the IC in excess of absolute maximum ratings such as the applied voltage or operating temperature range may result in IC damage. Assumptions should not be made regarding the state of the IC (short mode or open mode) when such damage is suffered. A physical safety measure such as a fuse should be implemented when use of the IC in a special mode where the absolute maximum ratings may be exceeded is anticipated. 2 ) Power supply lines As return of current regenerated by back EMF of output coil happens, take steps such as putting capacitor between power supply and GND as a electric pathway for the regenerated current. Be sure that there is no problem with each property such as emptied capacity at lower temperature regarding electrolytic capacitor to decide capacity value. If the connected power supply does not have sufficient current absorption capacity, regenerative current will cause the voltage on the power supply line to rise, which combined with the product and its peripheral circuitry may exceed the absolute maximum ratings. It is recommended to implement a physical safety measure such as the insertion of a voltage clamp diode between the power supply and GND pins. 3 ) GND potential(Pin 7, 19, 24). Any state must become the lowest voltage about GND terminal and VSS terminal. 4 ) Input terminal The parasitic elements are formed in the IC because of the voltage relation. The parasitic element operating causes the wrong operation and destruction. Therefore, please be careful so as not to operate the parasitic elements by impressing to input terminals lower voltage than GND and VSS. Please do not apply the voltage to the input terminal when the power-supply voltage is not impressed. 5 ) Setting of heat Use a thermal design that allows for a sufficient margin in light of the power dissipation (Pd) in actual operating conditions. This IC exposes its frame of the backside of package. Note that this part is assumed to use after providing heat dissipation treatment to improve heat dissipation efficiency. Try to occupy as wide as possible with heat dissipation pattern not only on the board surface but also the backside. Class D speaker amplifier is high efficiency and low heat generation by comparison with conventional Analog power amplifier. However, In case it is operated continuously by maximum output power, Power dissipation (Pdiss) may exceed package dissipation. Please consider about heat design that Power dissipation (Pdiss) does not exceed Package dissipation (Pd) in average power (Poav). (Tjmax : Maximum junction temperature=150℃, Ta : Peripheral temperature[℃], θja : Thermal resistance of package[℃/W], Poav: Average power[W], η: Efficiency) Package dissipation: Pd (W) = (Tjmax - Ta)/θja Power dissipation : Pdiss(W)= Poav ×(1/η- 1) 6 ) Actions in strong magnetic field Use caution when using the IC in the presence of a strong magnetic field as doing so may cause the IC to malfunction. 7 ) Thermal shutdown circuit This product is provided with a built-in thermal shutdown circuit. When the thermal shutdown circuit operates, the output transistors are placed under open status. The thermal shutdown circuit is primarily intended to shut down the IC avoiding thermal runaway under abnormal conditions with a chip temperature exceeding Tjmax = 150℃. 8 ) Shorts between pins and misinstallation When mounting the IC on a board, pay adequate attention to orientation and placement discrepancies of the IC. If it is misinstalled and the power is turned on, the IC may be damaged. It also may be damaged if it is shorted by a foreign substance coming between pins of the IC or between a pin and a power supply or a pin and a GND. 9 ) Power supply on/off (Pin 14, 15, 16, 27, 28) In case power supply is started up, RSTX (Pin 1) and MUTEX (Pin 2) always should be set Low. And in case power supply is shut down, it should be set Low likewise. Then it is possible to eliminate pop noise when power supply is turned on/off. And also, all power supply terminals should start up and shut down together. 10 ) ERROR terminal(Pin 10) A error flag is outputted when Output short protection and DC voltage protection in the speaker are operated. These flags are the function which the condition of this product is shown in. 11) Precautions for Spealer-setting If the impedance characteristics of the speakers at high-frequency range while increase rapidly, the IC might not have stable-operation in the resonance frequency range of the LC-filter. Therefore, consider adding damping-circuit, etc., depending on the impedance of the speaker. 12) Notes about the phase of MCLK (Pin6) and BCLK (Pin5) If the rising edge of MCLK (Pin6) and BCLK (Pin5) becomes simultaneous, noise or sound shutdown may occur. Please cope with it, when the rising edge of MCLK and BCLK becomes simultaneous. (Example: Insert RC filter in BCLK) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 32/34 2011.06 - Rev.A Technical Note BD5451EFV ●Package outline (HTSSOP-B28) BD5451EFV Lot No. (UNIT: mm) PKG: HTSSOP-B28 Drawing No: EX199-5002-1 ●Allowable Power Dissipation 6 HTSSOP-B28 Package PCB② 4.7W Power dissipation :Pd (W) 5 4 PCB① 3.3W 3 2 1 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 Ambient temperature :Ta (°C) Measuring instrument: TH-156(Shibukawa Kuwano Electrical Instruments Co., Ltd.) Measuring conditions: Installation on ROHM’s board Board size: 70mm×70mm×1.6mm(with thermal via on board) Material: FR4 ・The board on exposed heat sink on the back of package are connected by soldering. PCB①: 2-layer board(back copper foil size: 70mm×70mm)，θja=37.9℃/W PCB②: 4-layer board(back copper foil size: 70mm×70mm)，θja=26.6℃/W www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 33/34 2011.06 - Rev.A Technical Note BD5451EFV ●Ordering part number B D 5 Part No. 4 5 1 E Part No. F V Package EFV: HTSSOP-B28 - E 2 Packaging and forming specification E2: Embossed tape and reel HTSSOP-B28 <Tape and Reel information> 9.7±0.1 (MAX 10.05 include BURR) (5.5) 1 Tape Embossed carrier tape (with dry pack) Quantity 2500pcs Direction of feed E2 The direction is the 1pin of product is at the upper left when you hold ( reel on the left hand and you pull out the tape on the right hand ) 14 +0.05 0.17 -0.03 1PIN MARK 1.0MAX 0.625 1.0±0.2 (2.9) 0.5±0.15 15 4.4±0.1 6.4±0.2 28 +6° 4° −4° 0.08±0.05 0.85±0.05 S 0.08 S 0.65 +0.05 0.24 -0.04 0.08 1pin M Reel (Unit : mm) www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 34/34 Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. 2011.06 - Rev.A Datasheet Notice Precaution on using ROHM Products 1. Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment, OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you (Note 1) , transport intend to use our Products in devices requiring extremely high reliability (such as medical equipment equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance. Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific Applications. (Note1) Medical Equipment Classification of the Specific Applications JAPAN USA EU CHINA CLASSⅢ CLASSⅡb CLASSⅢ CLASSⅢ CLASSⅣ CLASSⅢ 2. ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which a failure or malfunction of our Products may cause. The following are examples of safety measures: [a] Installation of protection circuits or other protective devices to improve system safety [b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure 3. Our Products are designed and manufactured for use under standard conditions and not under any special or extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any special or extraordinary environments or conditions. If you intend to use our Products under any special or extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of product performance, reliability, etc, prior to use, must be necessary: [a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents [b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust [c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2 [d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves [e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items [f] Sealing or coating our Products with resin or other coating materials [g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning residue after soldering [h] Use of the Products in places subject to dew condensation 4. The Products are not subject to radiation-proof design. 5. Please verify and confirm characteristics of the final or mounted products in using the Products. 6. In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied, confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect product performance and reliability. 7. De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual ambient temperature. 8. Confirm that operation temperature is within the specified range described in the product specification. 9. ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in this document. Precaution for Mounting / Circuit board design 1. When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product performance and reliability. 2. In principle, the reflow soldering method must be used; if flow soldering method is preferred, please consult with the ROHM representative in advance. For details, please refer to ROHM Mounting specification Notice - GE © 2014 ROHM Co., Ltd. All rights reserved. Rev.002 Datasheet Precautions Regarding Application Examples and External Circuits 1. If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the characteristics of the Products and external components, including transient characteristics, as well as static characteristics. 2. You agree that application notes, reference designs, and associated data and information contained in this document are presented only as guidance for Products use. Therefore, in case you use such information, you are solely responsible for it and you must exercise your own independent verification and judgment in the use of such information contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of such information. Precaution for Electrostatic This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron, isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control). Precaution for Storage / Transportation 1. Product performance and soldered connections may deteriorate if the Products are stored in the places where: [a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2 [b] the temperature or humidity exceeds those recommended by ROHM [c] the Products are exposed to direct sunshine or condensation [d] the Products are exposed to high Electrostatic 2. Even under ROHM recommended storage condition, solderability of products out of recommended storage time period may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is exceeding the recommended storage time period. 3. Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads may occur due to excessive stress applied when dropping of a carton. 4. Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of which storage time is exceeding the recommended storage time period. Precaution for Product Label QR code printed on ROHM Products label is for ROHM’s internal use only. Precaution for Disposition When disposing Products please dispose them properly using an authorized industry waste company. Precaution for Foreign Exchange and Foreign Trade act Since our Products might fall under controlled goods prescribed by the applicable foreign exchange and foreign trade act, please consult with ROHM representative in case of export. Precaution Regarding Intellectual Property Rights 1. All information and data including but not limited to application example contained in this document is for reference only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any other rights of any third party regarding such information or data. ROHM shall not be in any way responsible or liable for infringement of any intellectual property rights or other damages arising from use of such information or data.: 2. No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any third parties with respect to the information contained in this document. Other Precaution 1. This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM. 2. The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written consent of ROHM. 3. In no event shall you use in any way whatsoever the Products and the related technical information contained in the Products or this document for any military purposes, including but not limited to, the development of mass-destruction weapons. 4. The proper names of companies or products described in this document are trademarks or registered trademarks of ROHM, its affiliated companies or third parties. Notice - GE © 2014 ROHM Co., Ltd. All rights reserved. Rev.002 Datasheet General Precaution 1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents. ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny ROHM’s Products against warning, caution or note contained in this document. 2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s representative. 3. The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or concerning such information. Notice – WE © 2014 ROHM Co., Ltd. All rights reserved. Rev.001