Middle Power Class-D Speaker Amplifiers Analog Input / BTL Output Class-D Speaker Amplifier BD5423AEFS No.10075EBT02 ●Description BD5423AEFS is a 17W + 17W stereo class-D power amplifier IC, developed for space-saving and low heat-generation applications such as low-profile TV sets. The 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 has achieved high efficiency of 90% (10W + 10W output with 8Ω load), which is the top class in the industry. The IC, in addition, employs a compact back-surface heat radiation type power package to achieve low power consumption and low heat generation and eliminates necessity of installing an external radiator, up to a total output of 34W. This product satisfies both needs for drastic downsizing, low-profile structures and powerful, highquality playback of the sound system. ●Features 1) A high efficiency of 90% (10W + 10W output with 8Ω load), which is the highest grade in the industry and low heat-generation. 2) An output of 17W + 17W (12V, with 4Ω load) is allowed without an external heat radiator. 3) Driving a lowest rating load of 4Ω is allowed. 4) Pop noise upon turning power on/off and power interruption has been reduced. 5) High-quality audio muting is implemented by soft-switching technology. 6) An output power limiter function limits excessive output to speakers. 7) High-reliability design provided with built-in protection circuits against high temperatures, against VCC shorting and GND shorting, against reduced-voltage, and against applying DC voltage to speaker. 8) A master/slave function allowing synchronization of multiple devices reduces beat noises. 9) Adjustment of internal PWM sampling clock frequencies (250kHz to 400kHz) allows easy protective measures against unwanted radio emission to AM radio band. 10) A compact back-surface heat radiation type power package is employed. HTSSOP-A44 (5mm × 7.5mm × 1.0mm, pitch 0.8mm ) ●Absolute Maximum Ratings A circuit must be designed and evaluated not to exceed absolute maximum rating in any cases and even momentarily, to prevent reduction in functional performances and thermal destruction of a semiconductor product and secure useful life and reliability. The following values assume Ta =25℃. For latest values, refer to delivery specifications. Parameter Symbol Ratings Unit Conditions VCC +20 V Power dissipation Pd 2.0 4.5 W W Pin 7, 8, 15, 16, 29, 30, 37, 38, 40 (Note 1, 2) (Note 3) (Note 4) Input voltage for signal pin VIN -0.2 ～ +7.2 V Pin 1, 44 (Note 1) Input voltage for control pin VCONT -0.2 ～ Vcc+0.2 V Pin 20, 24 (Note 1) Input voltage for clock pin VOSC -0.2 ～ +7.2 V Pin 23 (Note 1) Operating temperature range Topr -40 ～ +85 ℃ Storage temperature range Tstg -55 ～ +150 ℃ Tjmax +150 ℃ Supply voltage Maximum junction temperature (Note 1) A voltage that can be applied with reference to GND (pins 11, 12, 33, 34, and 43) (Note 2) Pd and Tjmax=150℃ must not be exceeded. (Note 3) 70mm × 70mm × 1.6mm FR4 One-sided glass epoxy board (Back copper foil 0%) installed. If used under Ta=25℃ or higher, reduce 16mW for increase of every 1℃. The board is provided with thermal via. (Note 4) 70mm × 70mm × 1.6mm FR4 Both-sided glass epoxy board (Back copper foil 100%) installed. If used under Ta=25℃ or higher, reduce 36mW for increase of every 1℃. The board is provided with thermal via. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 1/17 2010.05 - Rev.B Technical Note BD5423AEFS ●Operating Conditions The following values assume Ta =25℃. Check for latest values in delivery specifications. Parameter Symbol Ratings Unit Conditions Supply voltage VCC +10～+16.5 V Pin 7, 8, 15, 16, 29, 30, 37, 38, 40 Load resistance RL 4 ～ 16 Ω (Note 5) (Note 5) Pd should not be exceeded. ●Electrical Characteristics Except otherwise specified Ta = 25℃, VCC = 12V, fIN = 1kHz, Rg = 0Ω, RL = 8Ω、MUTEX="H", MS="L" For latest values, refer to delivery specifications. Symbol Limits Unit ICC1 25 mA With no signal ICC2 10 mA MUTEX = “L” “H” level input voltage VIH 2.3～12 V SDX, MUTEX, MS “L” level input voltage VIL 0～0.8 V SDX, MUTEX, MS Voltage gain GV 28 dB PO = 1W Maximum output power 1 (Note 6) PO1 10 W THD+N = 10%, RL = 8Ω Maximum output power 2 (Note 6) PO2 17 W THD+N = 10%, RL = 4Ω Total harmonic distortion (Note 6) THD 0.1 % PO = 1W, BW=20Hz～20kHz CT 85 dB PO = 1W, Rg = 0Ω, BW = IHF-A VNO 80 µVrms Rg = 0Ω, BW = IHF-A VNOM 1 µVrms Rg = 0Ω, BW = IHF-A, MUTEX = “L” FOSC 250 kHz Parameter Conditions Whole circuit Circuit current 1 (Sampling mode) Circuit current 2 (Muting mode) Control circuit Audio circuit Crosstalk Output noise voltage (Sampling mode) Residual noise voltage (Muting mode) Internal sampling clock frequency MS = “L” (In master operation) (Note 6) The rated values of items above indicate average performances of the device, which largely depend on circuit layouts, components, and power supplies. The reference values are those applicable to the device and components directly installed on a board specified by us. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 2/17 2010.05 - Rev.B Technical Note BD5423AEFS ●Electrical characteristic curves (Reference data) (1) Under Stereo Operation(RL=8Ω) 100 100 Vcc=12V RL=8Ω BW=20～20kHz 10 THD+N (%) THD+N (%) 10 6kHz 1 0.1 Vcc=12V RL=8Ω Po=1W BW=20～20kHz 1 0.1 1kHz 100Hz 0.01 0.01 0.001 0.01 0.1 1 OUTPUT POWER (W) 10 10 100 Fig. 1 THD+N － Output power 100 1000 10000 FREQUENCY (Hz) Fig. 2 THD+N － Frequency 0 40 Vcc=12V RL=8Ω Po=1W BW=20～20kHz -20 30 25 CROSSTALK (dB) VOLTAGE GAIN (dB) 35 Vcc=12V RL=8Ω Po=1W L=33µH C=0.47µF Cｇ=0.1µF 20 15 10 5 -40 -60 -80 0 -100 10 100 1000 10000 100000 10 100 FREQUENCY (Hz) 100000 20 OUTPUT POWER (W) Vcc=12V RL=8Ω fin=1kHz BW=20～20kHz -40 -60 -80 -100 0.001 10000 Fig. 4 Crosstalk - Frequency 0 -20 1000 FREQUENCY (Hz) Fig. 3 Voltage gain - Frequency CROSSTALK (dB) 100000 RL=8Ω fin=1kHz THD=10% 15 10 THD=1% 5 0 0.01 0.1 1 10 100 8 OUTPUT POWER (W) Fig. 5 www.rohm.com 12 14 16 18 VCC (V) Crosstalk - Output power © 2010 ROHM Co., Ltd. All rights reserved. 10 Fig. 6 3/17 Output power - Power supply voltage 2010.05 - Rev.B Technical Note BD5423AEFS 100 90 80 70 60 50 40 30 20 10 0 EFFICIENCY (%) EFFICIENCY (%) ●Electrical characteristic curves (Reference data) – Continued Vcc=10V RL=8Ω fin=1kHz 0 5 10 15 100 90 80 70 60 50 40 30 20 10 0 20 Vcc=12V RL=8Ω fin=1kHz 0 5 OUTPUT POWER (W/ch) 20 3 100 90 80 70 60 50 40 30 20 10 0 Vcc=16.5V Vcc=12V 2 Vcc=10V 1 Vcc=16.5V RL=8Ω fin=1kHz RL=8Ω fin=1kHz 0 0 5 10 15 0 20 5 10 15 20 25 30 35 40 TOTAL OUTPUT POWER (W) OUTPUT POWER (W/ch) Fig. 9 Efficiency - Output power Fig. 10 Current consumption - Output power 0 =8Ω RRLL=8Ω 無信号時 Without signal Vcc =12V Vcc=12V -20 NOISE FFT (dBV) ICC (mA) 15 Fig. 8 Efficiency - Output power ICC (A) EFFICIENCY (%) Fig. 7 Efficiency - Output power 100 90 80 70 60 50 40 30 20 10 0 10 OUTPUT POWER (W/ch) Sampling R RLL=8Ω =8Ω -40 無信号時 Without signal BW=20～20kHz BW=20 ～ 20kHz -60 -80 -100 -120 Mute Without -140 8 10 12 14 16 10 18 Fig. 11 Current consumption - Power supply voltage www.rohm.com 1000 10000 100000 FREQUENCY (Hz) VCC (V) © 2010 ROHM Co., Ltd. All rights reserved. 100 4/17 Fig. 12 FFT of Output Noise Voltage 2010.05 - Rev.B Technical Note BD5423AEFS ●Electrical characteristic curves (Reference data) – Continued MUTEX Pin 20 10V/div TM Pin 26 5V/div Vcc=12V MUTEX Pin 20 RL =8 Ω Po=500mW fin=500Hz TM Pin 26 2V/div Speaker Output 10V/div 5V/div Vcc=12V RL =8 Ω Po=500mW fin=500Hz 2V/div Speaker Output 10msec/div 10msec/div Fig. 13 Wave form when Releasing Soft-mute Fig. 14 Wave form when Activating Soft-mute VCCA VCCA VHOLD Pin 27 5V/div TM Pin 26 5V/div VHOLD Pin 27 Vcc=12V RL =8 Ω Po=500m W TM fin=3kHz Pin 26 5V/div Vcc=12V RL =8 Ω Po=500m W fin=3kHz 5V/div 2V/div Speaker Output 2V/div Speaker Output 20msec/div 2msec/div Fig. 15 Wave form on Instantaneous Power Interruption (20msec / div) 5V/div Soft Clip Speaker Output Soft Clip Fig. 16 Wave form on Instantaneous Power Interruption (2msec / div) Vcc=12V RL =8 Ω Po=5W THD+n=10% fin=1kHz R2=91k Ω R3=22k Ω 200μsec/div Fig. 17 Wave form on Output Power Limiter function (Po = 5W) www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 5/17 2010.05 - Rev.B Technical Note BD5423AEFS ●Electrical characteristic curves (Reference data) – Continued (2)Under Stereo Operation(RL=6Ω) OUTPUT POWER (W) 25 RL=6Ω fin=1kHz 20 THD=10% 15 10 5 0 8 10 12 14 16 18 VCC (V) 100 90 80 70 60 50 40 30 20 10 0 EFFICIENCY (%) EFFICIENCY (%) Fig. 18 Output power - Power supply voltage Vcc=10V RL=6Ω fin=1kHz 0 5 10 15 20 100 90 80 70 60 50 40 30 20 10 0 Vcc=12V RL=6Ω fin=1kHz 0 25 5 15 20 25 OUTPUT POWER (W/ch) OUTPUT POWER (W/ch) Fig. 19 Efficiency - Output power Fig. 20 Efficiency - Output power 4 100 90 80 70 60 50 40 30 20 10 0 Vcc=16.5V 3 ICC (A) EFFICIENCY (%) 10 Vcc=16.5V RL=6Ω fin=1kHz 0 5 10 15 20 Vcc=12V Vcc=10V 2 1 25 OUTPUT POWER (W/ch) RL=6Ω fin=1kHz 0 0 5 10 15 20 25 30 35 40 45 50 TOTAL OUTPUT POWER (W) Fig. 21 Efficiency - Output power Fig. 22 Current consumption - Output power Dotted lines of the graphs indicate continuous output power to be obtained on musical signal source or by installing additional heat sinks. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 6/17 2010.05 - Rev.B Technical Note BD5423AEFS ●Electrical characteristic curves (Reference data) – Continued (3) Under Stereo Operation(RL=4Ω) OUTPUT POWER (W) 30 RL=4Ω fin=1kHz 25 THD=10% 20 15 10 5 0 8 10 12 14 16 18 VCC (V) 100 90 80 70 60 50 40 30 20 10 0 EFFICIENCY (%) EFFICIENCY (%) Fig. 23 Output power - Power supply voltage Vcc=10V RL=4Ω fin=1kHz 0 5 10 15 100 90 80 70 60 50 40 30 20 10 0 20 Vcc=12V RL=4Ω fin=1kHz 0 5 OUTPUT POWER (W/ch) 20 Fig. 25 Efficiency - Output power 4 Vcc=12V Vcc=10V 3 ICC (A) EFFICIENCY (%) 15 OUTPUT POWER (W/ch) Fig. 24 Efficiency - Output power 100 90 80 70 60 50 40 30 20 10 0 10 2 Vcc=16.5V 1 Vcc=16.5V RL=4Ω fin=1kHz RL=4Ω fin=1kHz 0 0 5 10 15 20 0 OUTPUT POWER (W/ch) 5 10 15 20 25 30 35 40 TOTAL OUTPUT POWER (W) Fig. 26 Efficiency - Output power Fig. 27 Current consumption - Output power Dotted lines of the graphs indicate continuous output power to be obtained on musical signal source or by installing additional heat sinks. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 7/17 2010.05 - Rev.B 1.0 MAX 0.85 1 © 2010 ROHM Co., Ltd. All rights reserved. www.rohm.com (MAX 18.85 include BURR) (6.0) 44 BD5423AEFS 1PIN MARK 8/17 20 M UTEX M ute Control ERROR W ARNING N.C. 22 N.C. N.C. 21 N.C. 19 ERROR 18 16 V CCP1N Output DC V ol tage Protection Output Short Protection High Temperature Protection Under V ol tage Protection Protections & Logi c DRI VER 1N W ARNING 15 V CCP1N DRI VER 1P 17 14 OUT1N PW M 2 DRI VER 2N BSP1N 13 OUT1N PW M 1 DRI VER 2P (5.0) 12 8 V CCP1P GNDP1 7 V CCP1P 11 6 BSP1P GNDP1 5 PLM T4 10 4 PLM T3 OUT1P 3 PLM T2 9 L imi t 2 PLM T1 OUT1P Power 1 IN1 Clock Control Ramp Generator Soft M ute Power-off Detector 23 OSC 24 M S 25 ROSC 26 TM 27 VHOLD 28 BSP2N 29 V CCP2N 30 V CCP2N 31 OU T2N 32 OU T2N 33 GNDP2 34 GNDP2 35 OU T2P 36 OU T2P 37 V CCP2P 38 V CCP2P 39 BSP2P 40 V CCA 41 FIL P FILP V CCA 42 FIL A 43 GNDA FIL A GNDA 44 IN2 BD5423AEFS Technical Note ●Pin Assignment Top View Fig. 28 Pin Assignment Diagram ●Outer Dimensions and Inscriptions 18.5±0.1 TYPE 23 22 Lot No. 0.8 (Unit: mm) Fig. 29 Outer Dimensions and Inscriptions of HTSSOP-A44 Package 2010.05 - Rev.B Technical Note BD5423AEFS ●Explanation of Pin Functions (Provided pin voltages are typical values.) No. Symbol Pin voltage Pin description 1 44 IN1 IN2 3.5V Internal equalizing circuit ch1 Analog signal input pin ch2 Analog signal input pin Input audio signal via a capacitor. 2 PLMT1 3.5V Voltage-to-current conversion pin for output power limiter function Connect a register. 3 PLMT2 - Current-to-voltage conversion pin for output power limiter function Connect a register. 4 PLMT3 - Current-to-voltage conversion pin for output power limiter function Connect a register. Bias pin for output power limiter function 5 PLMT4 3.5V Connect a register and a capacitor. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 9/17 2010.05 - Rev.B Technical Note BD5423AEFS ●Explanation of Pin Functions (continued) No. Symbol Pin voltage 6 BSP1P - 7, 8 VCCP1P Vcc 9, 10 OUT1P Vcc～0V 11, 12 GNDP1 0V 13, 14 OUT1N Vcc～0V 15, 16 VCCP1N Vcc 17 BSP1N - Pin description Internal equalizing circuit ch1 positive bootstrap pin Connect a capacitor. ch1 positive power system power supply pin ch1 positive PWM signal output pin Connect with output LPF. ch1 power system GND pin ch1 negative PWM signal output pin Connect with output LPF. ch1 negative power system power supply pin ch1 negative bootstrap pin Connect a capacitor. Warning output pin 18 WARNING H: 5V L: 0V Pin to notify operation warning. H: Under warning L: Normal operation Connect a resister. Error output pin 19 ERROR H: 5V L: 0V A pin for notifying operation errors. H: Error L: Normal operation Connect a resister. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 10/17 2010.05 - Rev.B Technical Note BD5423AEFS ●Explanation of Pin Functions (continued) No. Symbol Pin voltage Pin description Internal equalizing circuit Audio mute control pin 20 MUTEX - 21, 22 N.C. - H: Mute off L: Mute on N.C. pin Nothing is connected with IC internal circuit. Sampling clock signal input/output pin 23 OSC - When using two or more sampling clocks, connect via a capacitor. Master/Slave switching pin 24 MS - 25 ROSC 5.6V 26 TM 0～5V Switching of master/slave functions on a sampling clock signal. H: Slave operation L: Master operation Internal PWM sampling clock frequency setting pin Usually the pin is used open. To adjust an internal sampling clock frequency, connect a resister. Audio muting constant setting pin Connect a capacitor. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 11/17 2010.05 - Rev.B Technical Note BD5423AEFS ●Explanation of Pin Functions (continued) No. Symbol Pin voltage Pin description Internal equalizing circuit Instantaneous power interruption detecting voltage setting pin 27 VHOLD 0.68×Vcc 28 BSP2N - 29, 30 VCCP2N Vcc 31, 32 OUT2N Vcc～0V 33, 34 GNDP2 0V OUT2P Vcc～0V 37, 38 VCCP2P Vcc 39 BSP2P - ch2 positive bootstrap pin Connect a capacitor. 40 VCCA Vcc Analog system power pin 41 FILP Vcc+35 12 35, 36 www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. Connect a capacitor. To adjust a detecting voltage, connect a resister. ch2 negative bootstrap pin Connect a capacitor. ch2 negative power system power supply pin ch2 negative PWM signal output pin Connect an output LPF. ch2 power system GND pin ch2 positive PWM signal output pin Connect an output LPF. ch2 positive power system power supply pin PWM system bias pin Connect a capacitor. 12/17 2010.05 - Rev.B Technical Note BD5423AEFS ●Explanation of Pin Functions (continued) No. Symbol Pin voltage Pin description Internal equalizing circuit Analog signal system bias pin 42 FILA 3.5V Connect a capacitor. 43 GNDA 0V www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. Analog system power supply pin 13/17 2010.05 - Rev.B © 2010 ROHM Co., Ltd. All rights reserved. www.rohm.com GNDA C8 10µ F C9 0.22µ F C10 1µ F 14/17 DRIV ER 1N C7 0.1µ F C13 0.22µ F C15 0.1µ F R4 M ute Control Output DC V oltage Protection Output Short Protection H igh Temperature Protection Under V oltage Protection Clock Control Ramp Generator Soft M ute 23 24 C27 3.3µ F C26 0.1µ F C23 0.1µ F 25 OPEN 26 27 L 31 15µ H GNDP CL K I/O GNDD N.C. 22 N.C. N.C. 21 N.C. 20 ERROR C42 10µ F 19 18 28 17 Power- off Detector 29 16 C28 0.68µ F R19 100kΩ DRIV ER 1P 30 C29 0.1µ F R18 100kΩ DRIV ER 2N Protections & Logic DRIV ER 2P 15 C37 0.1µ F 31 L 35 15µ H V CCP INPUT ch- 2 C38 14 32 33 34 35 36 10µ F 13 12 11 10 9 37 38 39 40 41 FIL P V CCA C44 2.2µ F M A STER SL A V E 0.22µ F M UTE C6 0.68µ F 0.22µ F ERROR OUTPUT C5 0.1µ F 8 PW M 2 C39 0.68µ F C31 W A RNING OUTPUT R3 22kΩ 7 PW M 1 C41 1µ F 6 W A RNING 4 42 43 FIL A GNDA C40 0.1µ F C35 L 13 15µ H L imit 5 Power 3 2 44 V CCA GNDP R2 22kΩ 1 C43 10µ F 4Ω SP ch1 GNDA V CCP C1 2.2µF GNDA L9 15µ H INPUT ch- 1 SP ch2 4Ω BD5423AEFS Technical Note ●Application Circuit Diagram. ・Vcc=10V～16.5V C32 1µ F 22kΩ C17 0.68µ F Fig. 30 Circuit diagram under stereo operation with 4-Ω load 2010.05 - Rev.B Technical Note BD5423AEFS Table 1 BOM list for stereo operation with 4-Ω load No. Item Part Number Vendor Configuration mm inch HTSSOP-A44 Rated voltage Value Tolerance 1 IC BD5423AEFS ROHM 2 C GRM219B31E684KA88D MURATA 3 C GRM188R11H104KA93 MURATA 1608 0603 0.1µF 50V ±10% 4 C GRM31MB11H224KA01 MURATA 3216 1206 0.22µF 50V ±10% 5 C 25ST225M3216 Rubycon 3225 1210 2.2µF 25V ±20% 6 C 50ST105M3225 Rubycon 3225 1210 1µF 50V 7 C GRM21BB31E335KA75 MURATA 2012 0805 3.3µF 25V 2012 0805 Temperature Quantity characteristics Reference - - - - 1 IC1 0.68µF 25V ±10% ±10% 4 C6, C17, C28, C39 ±10% 5 C7, C15, C29, C37, C40 ±10% 4 C9, C13, C31, C35 ±5% 2 C1, C44 ±20% ±5% 2 C10, C32 ±10% ±10% 1 C27 8 C GRM188B11E104KA MURATA 1608 0603 0.1µF 25V ±10% ±10% 3 C5, C23, C26 9 C GRM21BB11C105KA MURATA 2012 0805 1µF 16V ±10% ±10% 1 C41 10 C GRM21BB31C106KE15 MURATA 2012 0805 10µF 16V ±10% ±10% 1 C42 11 C 25SVPD10M SANYO 6666 2626 10µF 25V ±20% ±25% 3 C8, C38, C43 12 R MCR01MZPF2202 ROHM 1005 0402 22kΩ 50V ±1% ±200ppm/℃ 3 R2, R3, R4 13 R MCR01MZPF1003 ROHM 1005 0402 100kΩ 50V ±1% ±200ppm/℃ 2 R18, R19 No. Item Part Number Vendor Value Tolerance 14 7G09B-150M SAGAMI 15µH×2 ±20% L www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. Configuration mm 10×9×10 15/17 DC Rated Quantity Resistance DC Current 44mΩmax. 4.1A max. 2 Reference L9, L13, L31, L35 2010.05 - Rev.B Technical Note BD5423AEFS ●Notes for use 1. About absolute maximum ratings If an applied voltage or an operating temperature exceeds an absolute maximum rating, it may cause destruction of a device. A result of destruction, whether it is short mode or open mode, is not predictable. Therefore, provide a physical safety measure such as fuse, against a special mode that may violate conditions of absolute maximum ratings. 2. About power supply line 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. Potential of GND (11, 12, 33, 34, and 43 pins) Potential of the GND terminal must be the lowest under any operating conditions. 4. About thermal design Perform thermal design with sufficient margins, in consideration of maximum power dissipation Pd under actual operating conditions. This product has an exposed frame on the back of the package, and it is assumed that the frame is used with measures to improve efficiency of heat dissipation. In addition to front surface of board, provide a heat dissipation pattern as widely as possible on the back also. A class-D power amplifier has heat dissipation efficiency far higher than that of conventional analog power amplifier and generates less heat. However, extra attention must be paid in thermal design so that a power dissipation Pdiss should not exceed the maximum power dissipation Pd. Tjmax - Ta θ ja Maximum power dissipation Pd Power dissipation 1 Pdiss PO - 1 η W W Tjmax: Maximum temperature junction = 150[℃] Ta: Operating ambient temperature [℃] θja: Package thermal resistance [℃/W] Po: Output power [W] η: Efficiency 5. About operations in strong electric field Note that the device may malfunction in a strong electric field. 6. Thermal shutdown (TSD) 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℃, and is not intended to protect and secure an electrical appliance. Accordingly, do not use this circuit function to protect a customer's electrical appliance. 7. About shorting between pins and installation failure Be careful about direction and displacement of an LSI when installing it onto the board. Faulty installation may destroy the LSI when the device is energized. In addition, a foreign matter getting in between LSI pins, pins and power supply, and pins and GND may cause shorting and destruction of the LSI. 8. About power supply startup and shutdown When starting up a power supply, be sure to place the MUTEX pin (pin 20) at “L” level. When shutting down a power supply also, be sure to place the pin at “L” level. Those processes reduce pop noises generated upon turning on and off the power supply. In addition, all power supply pins must be started up and shut down at the same time. 9. About WARNING output pin (pin 18) and ERROR output pin (pin 19) A WARNING flag is output from the WARNING output pin upon operation of the high-temperature protection function and under-voltage protection function. And an ERROR flag is output from the ERROR output pin upon operation of VCC/GND shorting protection function and speaker DC voltage applying protection function. These flags are the function which the condition of this product is shown in. The use which aimed at the protection except for this product is prohibition. 10. About N.C. pins (pins 21 and 22) The N.C. (Non connection) pins are not connected with an internal circuit. Leave the pins open or connect them to GND. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 16/17 2010.05 - Rev.B Technical Note BD5423AEFS ●Ordering part number B D 5 Part No. 4 2 3 A E Part No. F - S Package EFS:HTSSOP-44 E 2 Packaging and forming specification E2: Embossed tape and reel HTSSOP-A44 <Tape and Reel information> 18.5±0.1 (MAX 18.85 include BURR) (6.0) 0.85 0.5±0.15 (5.0) 1 1.0±0.2 23 7.5±0.1 9.5±0.2 44 +6° 4° −4° Tape Embossed carrier tape (with dry pack) Quantity 1500pcs 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 ) 22 1PIN MARK +0.05 0.17 -0.03 1.0MAX S 0.08±0.05 0.85±0.05 0.08 S 0.8 +0.05 0.37 -0.04 0.08 M 1pin Reel (Unit : mm) www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 17/17 Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. 2010.05 - Rev.B Notice Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. The Products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). The Products specified in this document are not designed to be radiation tolerant. While ROHM always makes efforts to enhance the quality and reliability of its Products, a Product may fail or malfunction for a variety of reasons. Please be sure to implement in your equipment using the Products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM shall bear no responsibility whatsoever for your use of any Product outside of the prescribed scope or not in accordance with the instruction manual. The Products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuelcontroller or other safety device). ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing. If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law. Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact us. ROHM Customer Support System http://www.rohm.com/contact/ www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. R1010A