TECHNICAL NOTE Speaker / Headphone Amplifier Series 1.1W to1.5W Monaural Speaker Amplifiers BD7830NUV ●Description The BD7830NUV is a monaural speaker amplifier that operates at low voltage and was developed for portable navigation and mobile audio products. When in standby mode, its current consumption is 0 µA, and since it switches quickly and quietly from standby to ON, it is especially well suited for applications where there is frequent switching between standby and ON. ●Features 1) BTL monaural audio power amplifier 2) High power 2.25W 4Ω at Vcc=5V ,THD+N=10% High power 1.55W 8Ω at Vcc=5V ,THD+N=10% High power 0.77W 8Ω at Vcc=3.6V ,THD+N=10% 3) Wide operating supply voltage range: 2.4～5.5V 4) Low standby current: 0μA 5) Fast turn on/off time:46msec 6) Built-in Fade-in/out function 7) Built-in anti-pop function 8) Built-in thermal shutdown function 9) Very small package(VSON008V2030) ●Applications Mobile phones, Mobile electronic applications ● Absolute Maximum Ratings（Ta=+25℃） Parameter Symbol Ratings Unit Supply voltage Vcc 6.0 V Power dissipation Pd 530 *1 mW Storage temperature range Tstg -55～+150 ℃ Vstby -0.1～Vcc+0.1 STBY input range *1 ROHM standard one layer board (70mm×70mm×1.6mmt) mounted, deratings is done at 4.24mW/℃ above Ta=+25℃. V ● Operating Range Parameter Symbol Range Unit Temperature range Topr -40～+85 ℃ Supply voltage Vcc +2.4～+5.5 V ※ This product is not designed for protection against radioactive rays. Aug. 2008 ●Application Circuit Example STBY 1 H : ACTIVE L : STBY OUT2 8 BIAS 2 VCC 1μF 1 0.01uF Audio Input 0.1uF GND 7 Bias 2 2ndAmp SOFT 3 ※ 8Ω VDD 6 SOFT 1μF OUT1 5 IN－ 4 20k 1stAmp 20k ※3pin SOFT terminal 1 ： Usually 2 ： Enable to adjust fade in/out time by external capacitor ●Outer dimension D78 30 ● Reference land pattern (adapt as necessary to suit conditions during actual design.) Unit: mm L2 PKG type VSON008V2030 D3 MD1 PKG type VSON008V2030 E3 Land Lead pitch Gap Length Width e MD1 L2 b2 0.50 2.20 0.70 0.27 Central pad Length Width D3 E3 1.20 1.60 Thermal via Pitch Diameter ― φ0.300 ※ This package is a non-lead type, so solderability of the lead ends and sides is not guaranteed. Thermal via e b2 2/16 ● Electrical characteristics (Unless otherwise noted, Ta=+25℃, Vcc=+3.0V, f=1kHz, RL=8Ω) Parameter Symbol Supply current Standby supply current Output power Total harmonic distortion Voltage gain1 Voltage gain2 Power supply rejection ratio Mute attenuation Output voltage Output offset voltage STBY release voltage STBY hold voltage STBY input current H STBY input current L ICC ISTBY PO THD+N AV1 AV2 PSRR MUTE Vo ΔVo VSTBYH VSTBYL ISTBYH ISTBYL Limit MIN. TYP. MAX. ― ― 280 ― -1 -1 40 60 1.35 -40 1.4 -0.1 20 -2 3.2 0 420 0.1 0 0 57 80 1.5 0 ― ― 30 0 6.8 2 ― 0.5 +1 +1 ― ― 1.65 +40 Vcc+0.1 0.4 40 ― Unit Monitor pin Condition mA uA mW % dB dB dB dB V mV V V uA uA 6 6 5&8 5&8 5 8 5&8 5&8 5&8 5&8 1 1 1 1 Active mode Standby mode BTL, THD+N=1% *1 BTL, Po=150mW *1 Vin=-20dBV, 1stAmp Vin=-20dBV, 2ndAmp BTL, Vripple=0.2Vpp, *2 BTL, Vin=-20dBV Vin=0V ΔVo=|Vo1-Vo2| Active mode Standby mode VSTBY =3V VSTBY =0V *1：B.W.＝400～30kHz, *2：DIN AUDIO, SE：Single End, BTL：The voltage between 5pin and 8pin ● Measurement Circuit Diagram VSTBY STBY A OUT2 V 8 1 BIAS GND Bias 2 7 600 100μ 1μ VCC 1 3 0.01μ VCC VCC A IN－ OUT1 4 5 20k 8 50 6 SOFT 2 0.1μ Vin Vripple 2nd Amp SOFT 1μ V 1st Amp 600 20k ※3pin SOFT terminal 1 ： Usually 2 ： Enable to adjust fade in/out time by external capacitor ● Block diagram ●Pin assignment STBY OUT2 8 1 BIAS 2 Bias PIN No. PIN Name GND 1 STBY 7 2 BIAS 3 SOFT 4 IN- 5 OUT1 2nd Amp SOFT 3 VCC 6 SOFT IN－ OUT1 5 4 1st Amp 3/16 6 VCC 7 GND 8 OUT2 ●Input/output equivalent circuit PIN No. 1 PIN Name PIN description Equivalent circuit STBY Active/Standby Control pin STBY=H → Active STBY=L → Standby STBY 50k 1 100k BIAS 2 BIAS Bias capacitor Connection pin 25k 600k 20k SOFT 3 Fade-in/out SOFT IN- 1k 100k 1k 3 Adjustment pin 10k IN- 4 100k 2 Input pin 1k 4 1k 5 OUT1 8 OUT2 OUT1 (OUT2) 5 Output pin (8) 60k 6 VCC Power supply pin VCC 6 7 GND 7 注) GND GND pin The above numerical values are typical values for the design, which are not guaranteed. 4/16 ● Description of operations ① ON/OFF operation by STBY pin VCC Standby Active Standby STBY BIAS Delay (internally fixed OUT FADE IN FADE OUT Normal input mode Audio Input Once VCC = H, when STBY = L → H then BIAS and output (OUT) are activated. Once BIAS has become stable (= 1/2 VCC), output (OUT) fades in (FADE IN). Once STBY = H → L, output (OUT) starts to fade out (FADE OUT), and when fade-out ends, the BIAS falls. ② ON/OFF control by shorting of VCC and STBY pins VCC STBY Under voltage protection 1.78V (typ) BIAS Delay (internally fixed) OUT Audio Input When VCC = STBY = L → H, BIAS is activated. During low power mode (VCC < 1.78 V) protection is used to keep output (OUT) at low level, and FADE IN occurs when this protection is canceled. When VCC = STBY = H → L, output (OUT) falls without FADE OUT. 5/16 ● External components and cautions points Setting of external components STBY STBY OUT2 1 8 2 SPEAKER GND BIAS 7 Bias Cb 3 1μ 2ndAmp SOFT 8Ω VCC 6 SOFT Cs IN－ SP_IN OUT1 4 Ci 5 Ri 1stAmp Rf Cf ● Cb This is a bypass capacitor, which is used for bias voltage stabilization. When a larger capacitor is used, the efficiency of voltage ripple rejection can be improved. When tuning, note with caution that Cb can affect the activation time. Cb – Power Supply Ripple Rejection Ratio Cb – Turn-on Time Cb-ton 0 80 -10 70 -20 60 Cb=0.1uF -30 ton[ms] Power Supply Rejection Ratio[dB] Cb-PSRR Vcc=3V, Vripple=200mVpp, RL=8Ω Cb=0.47uF -40 Cb=1uF -50 50 40 30 20 Cb=2.2uF 10 -60 0 -70 10 100 1k Frequency[Hz] 10k 0 100k 0.5 1 1.5 Cb[uF] 6/16 2 2.5 ● Cs This capacitor is for adjustment of the FADE IN/OUT times. The FADE IN/OUT functions soften the operation (IN and OUT) of BTL output when switching between standby and active modes. When a capacitor is connected to the SOFT pin (pin 3), the FADE IN/OUT functions are valid. When the capacitor rating is increased, the FADE IN/OUT effect is also increased, but note with caution when setting this that it also affects the activation time. If the FADE IN/OUT functions are not being used, connect the SOFT pin (pin 3) to VCC. ・ Fade-in/out waveforms Active → Standby → Active Standby STBY 2V/div Ton Toff BTL output 0.5V/div Cs - Fade-in/out Time Cs-ton,toff 140 ton,toff[ms] 120 100 ton 80 60 40 toff 20 0 0 0.02 0.04 0.06 Cs[uF] 7/16 0.08 0.1 ● Ci This is a DC cut-off input coupling capacitor for the amp input pin. This includes an Ri and a high-pass filter. The cut-off frequency is calculated as follows. fcL = 1 2π×Ri×Ci [Hz] Ci – Low Frequency Characteristics Ci-Frequency characteristic 4 2 Gain [dB] 0 -2 -4 Ci:0.047uF -6 Ci:0.1uF Ci:0.22uF -8 -10 10 100 1k Frequency[Hz] 10k 100k Capacitors of a certain size are required for coupling without attenuation of low frequencies, but in most cases of speakers used in portable equipment, it is nearly impossible to reproduce signals in the 100 to 200 Hz range or below. Even when a larger capacitor is used instead, it may not improve system performance. Also, pop sounds can affect the capacitance (Ci) of the capacitor. A larger coupling capacitor requires a greater charge to reach the bias DC voltage (normally 1/2 VCC). Because this charge current is supplied from the output due to routing of feedback, pop sounds occur easily at startup. Consequently, pop sounds can be minimized by selecting the smallest capacitor that still has the required low-frequency response. ● Ri This is inverting input resistance, which sets the closed loop gain in conjunction with Rf. ● Rf This is feedback resistance, which sets closed loop gain in conjunction with Rf. The amp gain is set using the following formula. Gain = 20log Rf Ri [dB] ● Cf This is a feedback capacitor, which is used to cut high frequencies. This includes Rf and a low-pass filter. The cut-off frequency is calculated as follows. fcL = 1 2π×Ri×Ci [Hz] 8/16 ● Selection of external components ① Setting gain from desired output Output Po is determined via the following formula, from which the required gain Av can also be obtained. 2 Po [W] = Vo [Vrms] / RL [Ω] Vo = Av ・ Vin Av ≧ Po・RL / Vin ② Setting input resistance and feedback resistance from gain Gain Av is determined via the following formula, from which input resistance Rin and feedback resistance Rf can be set. Av = (Rf / Rin) ・ 2 Rin is set with the input side's drive capacity taken into account. ③ Setting input coupling capacitor from low-range cut-off frequency Low-range cut-off frequency fc is determined via the following formula, from which input coupling capacitor Cin can be set. fc [Hz] = 1 / (2π ・ Rin ・ Cin) Cin ≧ 1 / (2π ・ Rin ・ fc) ④ Setting bias capacitor and SOFT capacitor to minimize pops It is recommended that the capacitance of the bias capacitor CB be set to at least 10 times that of the input coupling capacitor Cin, in order to soften the rise of the bias voltage while improving the Cin following ability. Also, when a higher gain is used, the capacitance of the SOFT capacitor Cs can be raised to control pop sounds. Av = 2 (6 dB at BTL) → Cs ・ (80 / fc) ≧ 0.01 µF Av = 4 (12 dB at BTL) → Cs ・ (80 / fc) ≧ 0.022 µF Av = 8 (18 dB at BTL) → Cs ・ (80 / fc) ≧ 0.033 µF Av = 20 (26 dB at BTL) → Cs ・ (80 / fc) ≧ 0.068 µF ● Use when VCC = STBY short Since this IC is designed on the assumption that it will be used to switch standby mode ON and OFF while the power supply remains ON, normally STBY should be switched from H to L and the SOFT voltage should be discharged before powering down. When used while VCC = STBY short, pop sounds may occur if the IC's power supply is reduced prior to discharging the SOFT voltage. To prevent pop sounds, you must ① set STBY = H→L before setting VCC = H→L, and ② forcibly discharge the SOFT voltage. A sample circuit in which VCC = STBY short is used is shown below. ・Sample circuit configuration when VCC = STBY short ① STBY = H → L at STBY OUT2 8 1 GND BIAS 2 power-off Bias 7 1μ CD 2nd Amp SOFT 3 ② VCC 6 SOFT CS Fast discharge of VCC IN－ Cin OUT1 5 4 SOFT voltage at Rin 1st Amp power-off Slow power-off of IC itself Rf 9/16 ● Mechanism of pop sounds STBY Cin is low Gain is low (Rf) B IA S B IA S IN - IN - A b ou t 25 m s 0 .6 V C C SO FT N o p o ps OUT Cin is high STBY Gain is high (Rf) P o te n tia l d iffe re n c e B IA S B IA S IN - IN - About When SOFT voltage reaches 0.6 25 m s VCC, if there is a potential 0 .6 V C C SOFT difference between BIAS and IN-, pop sounds will occur. P O P so u n d s OUT At startup, the input coupling Cin is charged from output OUT via the feedback resistance Rf, so when Cin and Rf are high, charging takes longer and pop sounds can STBY 8 GND BIAS 2 easily occur. OUT2 1 Bias The rise of the SOFT voltage is 7 1μ 1μ 2nd Amp 3 VCC IN－ OUT1 4 600 Ri changed by CS, so pop sounds an be reduced by setting CS high. 6 SOFT CS Cin RL VCC SOFT 5 1st Amp Rf 10/16 ●Bass boost function External components can be added to this chip to provide a bass boost function. BIAS OUT1 IN- 5 4 Ci Ri Rfb Rf Cfb Gain Low frequency gain up fC 2 1 2 Cfb Rf [Hz] fC1 1 2 Cfb (Rf // Rfb ) [Hz] GC1 GC2 GC1 20 log Rf Rfb Ri [dB] GC2 20 log Rf (normal use) Ri [dB] f fC1 fC2 11/16 ● Thermal shutdown function When the chip exceeds the Tjmax (150°C) temperature by reaching a temperature of 180°C or above, the protection function is activated. High impedance is for OUT1 and OUT2 during protected mode. Protection is canceled and normal operation is resumed when the chip's temperature falls to 120°C or below. Chip temperature 180°C 120°C Protection start temperature: 180°C (typ) or more Protection cancel temperature: 120°C (typ) or less Output Protected operation Normal operation Normal operation ● Thermal design of chip The characteristics of the IC vary greatly depending on the use temperature, and when the maximum allowable junction temperature is exceeded, components may deteriorate or become damaged. Thermal considerations are needed for this chip from two standpoints: preventing instantaneous damage and improving long-term reliability. Note the following points with caution. The absolute maximum ratings for each chip include the maximum junction temperature (TjMAX) and operating temperature rate (Topr), and these values should be referred to when using the Pd-Ta characteristics (thermal dissipation curve). Since the IC itself is designed with full consideration of thermal balance, there are no problems in terms of circuit operations, but even when a more-than-adequate thermal design is implemented in order to get full use of the IC's performance features, some moderation is often required for the sake of practical usage. If there is an excessive input signal due to insufficient thermal dissipation, a TSD (thermal shutdown) operation may occur. Thermal Dissipation Curve Reference data VSON008V2030 1.0 Allowable loss Pd (W) 0.85W ① When mounted on ROHM standard 1-layer board Size: 70 mm × 70 mm × 1.6 mmt No copper heat sink (only mounting pattern) ② ② When mounted on 4-layer board Size: 76.2 mm × 76.2 mm × 1.6 mmt Layers 2 & 3 Copper foil No connection via thermal via 0.53W 0.5 ① 0 0 25 50 75 100 125 150 Ambient temperature Ta (°C) (Note) These are measured values. They are not guaranteed. The allowable loss value varies depending on the type of board used for mounting. When this chip is mounted on a multi-layer board that is designed for thermal dissipation, the allowable loss becomes greater than shown in the above figure. 12/16 ● Cautions on use (1) The above numerical values and data are typical values for the design, which are not guaranteed. (2) The application circuit examples can be reliably recommended, but their characteristics should be checked carefully before use. When using external component constants that have been modified, determine an ample margin that takes into consideration variation among the external components and Rohm's LSI IC chips, including variation in static characteristics and transient characteristics. (3) Absolute maximum ratings This IC may be damaged if the absolute maximum ratings for the applied voltage, temperature range, or other parameters are exceeded. Therefore, avoid using a voltage or temperature that exceeds the absolute maximum ratings. If it is possible that absolute maximum ratings will be exceeded, use fuses or other physical safety measures and determine ways to avoid exceeding the IC's absolute maximum ratings. The above numerical values and data are typical values for the design, which are not guaranteed. (4) GND pin's potential Try to set the minimum voltage for GND pin's potential, regardless of the operation mode. Check that the voltage of each pin does not go below GND pin's voltage, including transient phenomena. (5) Shorting between pins and mounting errors When mounting the IC chip on a board, be very careful to set the chip's orientation and position precisely. When the power is turned on, the IC may be damaged if it is not mounted correctly. The IC may also be damaged if a short occurs (due to a foreign object, etc.) between two pins, between a pin and the power supply, or between a pin and the GND. (6) Shorting output pin When output pin(5,8pin) is shorted to VCC or GND, the IC may be damaged by over current, so be careful in operation. (7) Thermal design Ensure sufficient margins to the thermal design by taking in to account the allowable power dissipation during actual use modes, because this IC is power amp. When excessive signal inputs which the heat dissipation is insufficient condition, it is possible that TSD(thermal shutdown circuit) is active. TSD is protection of the heat by excessive signal inputs, it is not protection of the shorting output to VCC or GND. (8) Shorted pins and mounting errors When the output pins (pins 5 and 8) are connected to VCC and GND, the thermal shutdown function repeatedly switches between shutdown (OFF) and cancel (ON). Note with caution that chip damage may occur if these connections remain for a long time. (9) Operating range The rated operating power supply voltage range(VCC=+2.4～+5.5V) and the rated operation temperature range (Ta=-40～+85℃) are the range by which basic circuit functions is operated. It is not guaranteed a specification and a rated output power about all operating power supply voltage range or operation temperature range. (10) Operation in strong magnetic fields Note with caution that operation faults may occur when this IC operates in a strong magnetic field. 13/16 ● Typical Characteristics (1) BD7830NUV f-THD+N VCC=3V,Ta=25℃,Po=150mW,RL=8Ω 10 10 1 1 THD+N[%] THD+N[%] BD7830NUV f-THD+N VCC=5V,Ta=25℃,Po=150mW,RL=8Ω 0.1 0.1 0.01 0.01 10 100 1k 10k 10 100k 100 1k 10k f[Hz] f[Hz] BD7830NUV Po-THD Ta=25℃,f=1kHz,RL=8Ω BD7830NUV VCC-Po Ta=25℃ f=1kHz 400～30kBPF THD+N=1.0% 10 100k 10000 RL=4Ω 1 VCC=3V Po[mW] THD[%] RL=8Ω 1000 VCC=5V 0.1 RL=16Ω 0.01 0.01 100 0.1 1 10 2 3 Po[W] 5 6 BD7830NUV frequency characteristic VCC=3V,Ta=25℃,Vin=-20dBV,RL=8Ω BD7830NUV frequency characteristic VCC=5V,Ta=25℃,Vin=-20dBV,RL=8Ω 10 10 5 Gain[dB] 5 Gain[dB] 4 Vcc[V] 0 -5 -10 0 -5 -10 -15 10 100 1k 10k -15 100k 10 f[Hz] 100 1k f[Hz] 14/16 10k 100k ● Typical Characteristics (2) 0 0 Power Supply Rejection Ratio[dB] -10 -20 -30 -40 -50 -60 -70 10 100 1k 10k -10 -20 -30 -40 -50 -60 -70 100k 10 f[Hz] 100 1k 10k f[Hz] 100k BD7830NUV Circuit current (STBY) Ta=25℃, RL=8Ω BD7830NUV Circuit current (ACT) Ta=25℃,RL=8Ω 8 0.10 Circuit current (STBY)[μA] Circuit current (ACT)[ｍA] 0.09 6 4 2 0 2 3 4 5 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0.00 6 2 3 VCC[V] 4 5 6 VCC[V] BD7830NUV RL-Po Ta=25℃, f=1kHz, THD+N=1% BD7830NUV Po-Pd 0.7 10.00 0.6 VCC=5.5V 0.5 VCC=5V VCC=3V 1.00 0.4 Po Pd[W] Power Supply Rejection Ratio [dB] BD7830NUV f-PSRR Ta=25℃, VCC=3V,Vripple=200mVpp,30kLPF BD7830NUV f-PSRR Ta=25℃,VCC=5V, Vripple=200mVpp,30kLPF VCC=3V 0.3 0.10 0.2 VCC=2.4V 0.1 0.0 0.01 0.0 0.5 1.0 1.5 1 Po[W] 10 RL[Ω] 15/16 100 ●Selection of order type B D 7 8 3 0 N U V T R Tape and Reel information Part No. BD7830NUV VSON008V2030 <Dimension> <Tape and Reel information> Tape 3.0 ± 0.1 2.0±0.1 1.0MAX 1PIN MARK Quantity 4000pcs Direction of feed TR (The direction is the 1pin of product is at the upper light when you hold reel on the left hand and you pull out the tape on the right hand) +0.03 0.02 -0.02 (0.22) S Embossed carrier tape 0.08 S 1.5±0.1 0.5 C0.25 4 8 5 0.25 1.4 ± 0.1 0.3 ± 0.1 1 +0.05 0.25 -0.04 (Unit:mm) 1Pin Direction of feed Reel ※When you order , please order in times the amount of package quantity. Catalog No.08T300A '08.8 ROHM © Appendix Notes No technical content pages of this document may be reproduced in any form or transmitted by any means without prior permission of ROHM CO.,LTD. The contents described herein are subject to change without notice. The specifications for the product described in this document are for reference only. Upon actual use, therefore, please request that specifications to be separately delivered. Application circuit diagrams and circuit constants contained herein are shown as examples of standard use and operation. Please pay careful attention to the peripheral conditions when designing circuits and deciding upon circuit constants in the set. Any data, including, but not limited to application circuit diagrams information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices. Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or otherwise dispose of the same, no express or implied right or license to practice or commercially exploit any intellectual property rights or other proprietary rights owned or controlled by ROHM CO., LTD. is granted to any such buyer. Products listed in this document are no antiradiation design. The products listed in this document are designed to be used with ordinary electronic equipment or devices (such as audio visual equipment, office-automation equipment, communications devices, electrical appliances and electronic toys). Should you intend to use these products with equipment or devices which require an extremely high level of reliability and the malfunction of which would directly endanger human life (such as medical instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other safety devices), please be sure to consult with our sales representative in advance. It is our top priority to supply products with the utmost quality and reliability. However, there is always a chance of failure due to unexpected factors. Therefore, please take into account the derating characteristics and allow for sufficient safety features, such as extra margin, anti-flammability, and fail-safe measures when designing in order to prevent possible accidents that may result in bodily harm or fire caused by component failure. ROHM cannot be held responsible for any damages arising from the use of the products under conditions out of the range of the specifications or due to non-compliance with the NOTES specified in this catalog. Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact your nearest sales office. ROHM Customer Support System www.rohm.com Copyright © 2008 ROHM CO.,LTD. THE AMERICAS / EUROPE / ASIA / JAPAN Contact us : webmaster@ rohm.co. jp 21 Saiin Mizosaki-cho, Ukyo-ku, Kyoto 615-8585, Japan TEL : +81-75-311-2121 FAX : +81-75-315-0172 Appendix1-Rev2.0