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Rohm BD7836EFV Technical Notes

Class-ab speaker amplifiers
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Class-AB Speaker Amplifiers
1.9W+1.9W
Stereo Speaker Amplifier
BD7836EFV
●Description
BD7836EFV is a Class-AB stereo speaker amplifier, developed for note-book PC, desktop PC, portable devices and others.
Class-AB amplifier has no EMI noise. Power package HTSSOP-B20 can realize high output power.
Low circuit current at active mode reduce consumption of battery. Shutdown current is 0.1µA typically, and pop noise level
when shutdown turns on and off is very small. This device is suitable for the application that often changes mode between
"shutdown state" and "active state".
●Features
1) High power 1.9W typ. (VDD=5V, R
High power 1.2W typ. (VDD=5V, R
2) Gain selectable by the external control (6,10,15.6,21.6dB)
3) Pop noise suppression circuitry
4) Shutdown function (also Mute function) [I
5) Protection circuitry (Thermal shutdown, Under voltage lockout)
6) Power Package with thermal pad HTSSOP-B20
●Applications
Note-book PC, Desktop PC, etc.
●Absolute maximum ratings (Ta=+25℃)
Parameter
Power Supply Voltage
Power Dissipation
Storage Temperature
Input Terminal Input Voltage Range
Control Terminal Input Voltage Range
*1 70mm×70mm×1.6mm FR4 1-layer glass epoxy board(Copper on top layer 0%)
Derating in done at 8mW/℃ for operating above Ta=25℃. There are thermal via on the board.
*2 70mm×70mm×1.6mm FR4 4-layer glass epoxy board (Copper on bottom 2 and 3 layer 100%)
Derating in done at 25.6mW/℃ for operating above Ta=25℃. There are thermal via on the board.
*3 Input Terminal (LIN+, LIN-, RIN+, RIN-)
*4 Control Terminal ( SHUTDOWN , GAIN0, GAIN1)
●Operating conditions
Parameter
Power Supply Voltage
Temperature
*
These products aren't designed for protection against radioactive rays.
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
=4Ω, THD+N=1%, stereo input)
L
=8Ω, THD+N=1%, stereo input)
L
=0.1µA(typ.)]
sd
Symbol
VDDmax
Pd
-55 ～ +150
Tstg
*3
Vin
-0.3～VDD+0.3
*4
Vctl
-0.3～VDD+0.3
Symbol
+4.5 ～ +5.5
VDD
-40 ～ +85
Topr
1/16
Ratings
Unit
7.0
V
*1
1
W
*2
3.2
W
℃
V
V
Range
Unit
V
℃
No.10077EAT07
2010.07 - Rev.A

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Summary of Contents for Rohm BD7836EFV

  • Page 1 BD7836EFV ●Description BD7836EFV is a Class-AB stereo speaker amplifier, developed for note-book PC, desktop PC, portable devices and others. Class-AB amplifier has no EMI noise. Power package HTSSOP-B20 can realize high output power. Low circuit current at active mode reduce consumption of battery. Shutdown current is 0.1µA typically, and pop noise level when shutdown turns on and off is very small.
  • Page 2 *1: B.W.=400 ～ 30kHz ， BTL ： The voltage between 4pin and 8pin, 14pin and 18pin. ●Control terminal’s settings SHUTDOWN IC condition Active Shutdown GAIN0 GAIN1 Gain Input resistance 90kΩ (TYP.) 10dB 70kΩ (TYP.) 15.6dB 45kΩ (TYP.) 21.6dB 25kΩ (TYP.) www.rohm.com 2010.07 - Rev.A 2/16 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 3 Supply voltage terminal Supply voltage terminal RIN- Right channel negative differential input Fig.2 ROUT+ Right channel positive output Places IC in shutdown mode when SHUTDOWN held low Ground www.rohm.com 2010.07 - Rev.A 3/16 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 4 0.1µＦ 0.1µＦ Power BYPASS GAIN0 Management Gain 0.47µＦ SHUT- Control GAIN1 DOWN System Control 1,11, 0.47µＦ 13,20 LIN- LOUT+ Left Line Input 0.47µＦ Signal LIN+ LOUT- Fig.3 www.rohm.com 2010.07 - Rev.A 4/16 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 5 GAIN0 Management Gain SHUT- 0.47µＦ Control GAIN1 DOWN Left System Control Line Input LIN- Signal 1,11, 0.47µＦ 13,20 LIN- LOUT+ LIN+ 0.47µＦ LIN+ LOUT- Fig.5 Differential inputs www.rohm.com 2010.07 - Rev.A 5/16 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 6 GRM188R71C474KA01D Murata Capacitor, 0.1μF 1608 GRM188R71C104KA01D Murata CBYP Capacitor, 0.47μF 1608 GRM188R71C474KA01D IC, BD7836EFV, ROHM PKG:HTSSOP-B20 Class-AB stereo speaker Amplifier BD7836EFV-E2 Printed-circuit board ― ― PCB1 BD7836EFV www.rohm.com 2010.07 - Rev.A 6/16 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 7 Connect to GND line or VDD line or input Low or high level voltage to terminals in order to avoid the terminals made high Impedance. Using IC under the control terminal let high impedance, operation fault may occur. www.rohm.com 2010.07 - Rev.A 7/16 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 8 Technical Note BD7836EFV ●Evaluation board PCB layer Fig.7 Top layer Fig.8 Bottom Layer www.rohm.com 2010.07 - Rev.A 8/16 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 9 Please makes the value of all input capacitors same because of preventing pop noise. If they are not same value, for example, LOUT+=0.47µF, LOUT-=0.33µF, it caused pop noise increase and characteristics become worse. www.rohm.com 2010.07 - Rev.A 9/16 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 10 TSD affects decrease IC reliability. Temperature Derating Curve Reference Data HTSSOP-B20 Measurement conditions: IC unit Rohm standard board mounted Board ： 70mm × 70mm × 1.6mmt board ① FR4 1-layer glass epoxy board (Copper on top layer 0%) ④3.2W board ②...
  • Page 11 Crosstalk vs. Frequency Supply ripple rejection ratio vs. Frequency Shutdown attenuation vs. Frequency Power dissipation vs. Output power Efficiency vs. Output power Output power vs. Load resistance www.rohm.com 2010.07 - Rev.A 11/16 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 12 THD+N vs Frequency VDD=5V, RL=8Ω, Po=1W THD+N vs Frequency VDD=5V, RL=8Ω, Po=1W 400Hz-30kHz 400Hz-30kHz Po=0.25W 10dB Po=0.5W 15.6dB Po=1W 21.6dB 0.01 0.01 100k 100k Frequency [Hz] Frequency [Hz] Fig.17 Figure.7 Figure.8 Fig.18 www.rohm.com 2010.07 - Rev.A 12/16 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 13 Cross talk vs Frequency VDD=5V, RL=8Ω, 10Hz-500kHz Gv=6dB 80ｋHz LPF 10dB 15.6dB Left to Right 21.6dB Right to Left -100 -120 100k 100k Frequency [Hz] Frequency [Hz] Fig.25 Fig.26 Figure.15 Figure.16 www.rohm.com 2010.07 - Rev.A 13/16 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 14 RL=4Ω RL=4Ω RL=3Ω RL=3Ω Outputpower [W] Output power [W] Fig.30 Figure.19 Figure.20 Fig.29 Output power vs Load Resisitance VDD=5V, Gv=6dB, f=1kHz THD=1％ THD=10％ Load Resistance[Ω] Figure.20 Fig.31 www.rohm.com 2010.07 - Rev.A 14/16 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 15 (10) Electrical characteristics Electrical characteristics show the typical performance of device and depend on board layout, parts, power supply. The standard value is in mounting device and parts on surface of ROHM’s board directly. (11) Maximum output power When stereo inputs at R =4Ω, maximum output power may not achieve up to typical value because the device heats.
  • Page 16 0.17 -0.03 0.08 S 0.65 +0.05 Direction of feed 0.24 -0.04 1pin Reel ∗ (Unit : mm) Order quantity needs to be multiple of the minimum quantity. www.rohm.com 2010.07 - Rev.A 16/16 © 2010 ROHM Co., Ltd. All rights reserved.
  • Page 17 (“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.

  • Page 18: Data Sheet

    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.:...
  • Page 19 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.
  • Page 20 Datasheet bd7836efv - Web Page Distribution Inventory Part Number bd7836efv Package HTSSOP-B20 Unit Quantity 2500 Minimum Package Quantity 2500 Packing Type Taping Constitution Materials List inquiry RoHS...

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