Class-AB Speaker Amplifiers
1.1W to1.5W Monaural Speaker Amplifiers
BH7824FVM,BH7826FVM
No.11090EBT01
●Description The BH7824FVM and BH7826FVM are speaker amplifier ICs for low-voltage drives and low power consumption audio, specialized for mobile telephones and other mobile audio devices. ●Features 1) BTL monaural speaker amplifier 2) Capable of high power 500mW/8Ω/BTL output 3) Wide power supply voltage range 4) Supports active/shutdown modes 5) Built-in anti-pop circuit 6) Built-in thermal shutdown circuit ●Applications Mobile telephones, PDAs, notebook computers, DSC, DVC, and other mobile audio devices. ●Product lineup Part No. Input type Supply voltage(V) ●Absolute maximum ratings(Ta=25℃) Parameter Supply voltage Power dissipation Operating temperature Storage temperature
*1 *2
BH7824FVM Unbalanced input 2.4 ~ 5.5
BH7826FVM Balanced input 2.6 ~ 5.5
Symbol VCCmax. Pd Topr Tstg
Limits 6.0 470(*1) -30 ~ +85(*2) -55 ~ +125
Unit V mW ℃ ℃
Reduced by 4.7 mW/C at 25C or higher, when mounted on a 70mm×70mm×1.6mm PCB board. Topr=70℃ ~ 85℃ is the range for performing basic operations and does not guarantee characteristics or rated output. Moreover, TSD (Thermal Shutdown) may become operable if input signals occurring in this range are excessive.
500 Power dissipation Pd[mW] 400 300 200 100 0 0 50 100 150 Temperature Ta[℃]
Fig.1 Ta-Pd (when mounted on a PCB board)
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1/14
2011.08 - Rev.B
BH7824FVM,BH7826FVM
●Operating conditions Parameter Supply voltage (Ta=25℃) Ratings BH7824FVM 2.4V ~ 5.5V BH7826FVM 2.6 ~ 5.5
Technical Note
* Note: This IC is not designed to be radiation-resistant.
●Electrical characteristics Parameter Circuit current 1 Circuit current 2 Voltage gain 1 Voltage gain 2
(Unless otherwise noted Ta=25℃, Vcc=3.6V, f=1kHz, RL=8Ω) Limits(Typ.) Symbol Unit BA7824FVM BA7826FVM ICC1 ICC2 GV1 GV2 VOM1 VOM2 DSTN VNO GS VBIAS VSH1 VSH2 3.5 0 +11.5 0 +6.0 ― 0.07 -94 -107 1.8 VCC×0.8 ~ VCC 0 ~ 0.5 3.5 0 +11.5 ― +6.0 +5.1 0.2 -94 -107 1.8 2.0 ~ VCC 0 ~ 0.5 mA μA dB dB dBV dBV % dBV dBV V V V
Conditions
No signal , Active mode No signal, Suspend mode VIN=-20dBV,1st Op-amp gain 2nd Op-amp gain DSTN=1% ,BTL *1 VCC=3.4V,DSTN=1%,BTL *1 VIN=-20dB,V SE *1 No signal, SE Active mode *2 VIN=-20dB,V BTL *2 3pin DC voltage Active mode, Hold voltage Suspend mode, Hold voltage
Maximum output voltage1 Maximum output voltage2 Output distortion Output noise level Suspend attenuation Bias setting voltage Suspend hold voltage / H Suspend hold voltage / L
*1 : B.W.=0.4 ~ 30kHz *2 : DIN AUDIO
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2/14
2011.08 - Rev.B
BH7824FVM,BH7826FVM
●Measurement circuit
Technical Note
1 A/S 2 3 4 600 22k
100k
BIAS
8 7 6 5 8
V
0.1μ 1.0μ
0.1μ
V
0.1μ
100μ
Fig.2 BH7824FVM
100k VIN 2 0.1μ 22k 1 600 2 A/S
3
BI AS
8 7 6 5 100k 8
100μ
V
0.1μ VCC
VI N1
0.1μ
1μ 22k 4
V
600
Fig.3 BH7826FVM
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3/14
2011.08 - Rev.B
BH7824FVM,BH7826FVM
●Block diagram
Technical Note
SUSPEND CTRL 1 A/S
8 SP OUT 2
BIAS OUT 2
7 GND
BIAS IN 3
BIAS
6
VCC
SP IN
4
5 SP OUT 1
Fig.4 BH7824FVM
SP IN 2 1
8 SP OUT 2 7 GND
BIAS
SUSPEND CTRL 2 A/S
BIAS
3
6 VCC 5 SP OUT 1
SP IN 1 4
Fig.5 BH7826FVM
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4/14
2011.08 - Rev.B
BH7824FVM,BH7826FVM
●Equivalent circuit Pin No. BH7824FVM Pin name Equivalent circuit Pin name BH7826FVM
Technical Note
Equivalent circuit
1
SUSPEND CTRL
01
50k 50k
1k
SP IN2
01
100k
2
BIAS OUT
30k 487k 30k
02
SUSPEND CTRL
02
100k
3
BIAS IN
30k 57k 30k
03
BIAS IN
30k 150k 30k
03
4
SP IN
1k
04
SP IN1
1k
04
5
SP OUT1
05
SP OUT1
05
6
VCC
－
VCC
－
7
GND
－
GND
－
8
SP OUT2
08
SP OUT2
08
Note: Numerical values in figures are design values, and do not guarantee ratings.
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5/14
2011.08 - Rev.B
BH7824FVM,BH7826FVM
●Application circuit BH7824FVM
Technical Note
SUSPEND
01 A/S 02 03 04 R1 R2
BIAS
08 07 SPEAKER 06 05
SP_IN(L+R)
Cf
Fig.6
BH7826FVM
Cf
R2 SP_IN 2 0.1 μ R1 01 SUSPEND 1μ 03 S P_IN 1 0 .1μ 04 R1 R2 05
BIAS
08 07 1μ 06 S PEAKER
02
Cf
Fig.7
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6/14
2011.08 - Rev.B
BH7824FVM,BH7826FVM
●Functions and Settings of external components
Technical Note
【Function of external components】 ①R1 R1 is an input resistor of inverting amplifier which determines closed loop gain with R2. ②R2 R2 is a feedback resistor of inverting amplifier determine closed loop gain with R2. The gain is set by below expression. Gain = 20log ③Cf Cf is feedback capacitor to cut high frequency signals. It forms a low-pass filter with R2. The cut-off frequency is calculated as below. fcL = [Hz] 1 2π×R2×Cf (注) R1,R2,Cf and fcL has limits in below table. Please set these component values in the ranges. Ranges Rin Rf Cf fcL ④Cb1 (Cb2 is only BH7824FVM.) The capacitors stabilize DC bias voltage. BH7824FVM Cb1 Cb2 1µF 0.1µF BH7826FVM 1µF ― 10kΩ ≦ R1 ≦120kΩ 47kΩ ≦ R2 ≦120kΩ Gain＞+6dB 0＜Gain≦+6dB fcL Cf≦560pF Cf≦270pF ≧ 4kHz R2 R1 [dB]
As Cb1 (or Cb2) becomes larger, power supply rejection ratio is improved but turn on time becomes longer. As it becomes smaller, turn on time becomes shorter but power supply rejection ratio and cross talk become worse. ⑤Cin It is Input coupling capacitor. The value of the input capacitor directly affects the low frequency performance of the circuit. The corner frequency of the high pass filter is determined in equation at ③ of next section. 【Configuration of external components 】 ① Gain Gain is designed by output power application ask for. Output power is determined to below.
2 Po[W] = Vo [Vrms] / RL[Ω] Vo = Gv・Vin
Gv ≧ Po・RL / Vin ② Values of R1 and R2 R1 and R2 are determined to Av. Av = ( R2 / R1 )×2 Input impedance (R1) must be probable driven by signal source Input coupling capacitor Corner frequency of HPF is determined in below. fc[Hz] = 1 / (2π・R1・Cin) Input coupling is solved by equation of fc. Cin ≧ 1 / (2π・R1・fc)
③
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7/14
2011.08 - Rev.B
BH7824FVM,BH7826FVM
【instruction for use carefully】 ①Do not connect capacitive load has more than below capacitance between OUT1,2(5,8pin) and GND otherwise oscillation may occured. 8, 12ΩSpeakers BH7824FVM / 26FVM Co Co ≦ 100pF 16Ωspeaker BH7824FVM Co ≦ 47pF
Technical Note
Co
07
Co
06
Fig.8 Output connections ②Do not use this IC without a load.
③This IC is compatible with dynamic speaker loads (8～40Ω：BH7824FVM、8～12Ω：BH7826FVM) and is not compatible with loads other than these mentioned.
④soft mute setting becomes effective on connecting a resistor and capacitor to the SUSPEND pin (1pin: BH7824FVM, 2pin: BH7826FVM).
VCC R C 1
Recommendation value R：100kΩ C：0.47µF
Fig.9 BH7824FVM application circuit for soft mute ⑤Place the Vcc decoupling capacitor between VCC(6pin) and GND(7pin) as close to IC as possible.
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8/14
2011.08 - Rev.B
BH7824FVM,BH7826FVM
●Typical characteristics(BH7824FVM)
Technical Note
10 CIRCUIT CURRENT：ICCA[mA] 8 6 4 2 0 1.5
2 CIRCUIT CURRENT：ICCS[uA]
4.0 4.5 5.0 5.5 Ta=Room temperature RL=8Ω SUSPEND=VCC
Ta=Room temperature RL=8Ω SUSPEND=0V
1
0
2.0 2.5 3.0 3.5
1.5
2
SUPPLY VOLTAGE：VCC [V]
Fig.11 Circuit current (ACTIVE) － Power supply
2.5 3 3.5 4 4.5 SUPPLY VOLTAGE：VCC[V]
5
5.5
Fig.12 Circuit current (SUSPEND) － Power supply
700
1200 OUTPUT POWER：Po[mW] 1000 800 600 400 RL=16Ω 200 0 1.5 2 2.5 3 3.5 4 4.5 SUPPLY VOLTAGE：VCC[V] 5 5.5 Ta=Room temperature f=1kHz THD+N=1.0% 400～30kBPF AV=8
600
RL=12Ω RL=8Ω
POWER DISSIPATION：PD [mW]
500 400 300 200 100 0 0 200 400
RL=8Ω
RL=16Ω
Ta=Room temperature VCC=5.0V f=1kHz 400～30kBPF THD+N≤1.0%
600 800 1000 1200
OUTPUT POWER：Po[mW]
Fig.14 Power dissipation － Outpu power
Fig.13 Output power － Power supply
350 300
POWER DISSIPATION：PD [mW]
250 200 150 100 50 0
RL=8Ω
RL=16Ω
Ta=Room temperature VCC=3.6V f=1kHz 400～30kBPF THD+N≤1.0%
300 400 500 600
0
100
200
OUTPUT POWER：Po[mW]
Fig.15 Power dissipation － Outpu power
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9/14
2011.08 - Rev.B
BH7824FVM,BH7826FVM
Technical Note
1000
OUTPUT POWER：Po[mW]
OUTPUT POWER：Po[mW]
100
Ta=Room temperature VCC=3.6V f=1kHz RL=8Ω 400～30kBPF THD+N≤1.0% AV=8
1000
100
Ta=Room temperature VCC=3.6V f=1kHz RL=8Ω 400～30kBPF THD+N≤1.0% AV=2
10
10
1 -40 -35 -30 -25 -20 -15 -10
1 -25 -20 -15 -10 -5 0 5
INPUT LEVEL：Vin[dBV]
Fig.16 Output Power － Input level
INPUT LEVEL：Vin[dBV]
Fig.17 Output Power － Input level
10.00
1.00
THD+N[%]
Ta=Room temperature VCC=5.0V RL=8Ω f=1kHz AV=8 400～30kBPF
THD+N[%]
10.00
1.00
Ta=Room temperature VCC=5.0V RL=8Ω f=1kHz AV=2 400～30kBPF
0.10
0.10
0.01
1m 0.001
10m 0.01
100m 0.1
1 1
10 10
0.01
1m 0.001
10m 0.01
10.1 00m
1 1
10 10
OUTPUT POWER：Po[W]
OUTPUT POWER：Po[W]
Fig.18 THD + Noise － Output Power
Fig.19
THD + Noise － Output Power
10.00 Ta=Room Fi 率 － 出力電力特性 temperature VCC=3.6V RL=8Ω f=1kHz AV=8 1.00 400～30kBPF
THD+N[%]
THD+N[%]
10.00
1.00
Ta=Room temperature VCC=3.6V RL=8Ω f=1kHz AV=2 400～30kBPF
0.10
0.10
0.01
10.001 m 0.01 10m 0.1 100m 11 10 10
0.01
1m 0.001 10m 0.01 100m 0.1 1 1 10 10
Fig.20
OUTPUT POWER：Po[W] THD + Noise － Output Power
OUTPUT POWER：Po[W]
Fig.21
THD + Noise － Output Power
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10/14
2011.08 - Rev.B
BH7824FVM,BH7826FVM
Technical Note
1
THD+N[%]
0.1
THD+N[%]
Ta=Room temperature VCC=5.0V RL=8Ω Po=300mW AV=8 WIDE BAND
1
Ta=Room temperature VCC=5.0V RL=8Ω Po=300mW AV=2 WIDE BAND
0.1
0.01
10 10 100 100 1000 1k 10000 10k 100000 100k
0.01
10 10 100 100 1k 1000 10k 10000 100k 100000
FREQUENCY：f[Hz]
Fig.22 THD + N － Frequency Fig.23
FREQUENCY：f[Hz]
THD + N － Frequency
10
10
Ta=Room temperature VCC=3.6V RL=8Ω Po=150mW AV=8 WIDE BAND
1
THD+N[%]
1 THD+N[%]
Ta=Room temperature VCC=3.6V RL=8Ω Po=150mW AV=2 WIDE BAND
0.1
0.1
0.01
0.01
10 10
100 100 1000 1k 10000 10k 100000 100k
110 0
100 100
1000 1k
10000 10k
100000 100k
FREQUENCY：f[Hz]
FREQUENCY：f[Hz]
Fig.25 THD + N － Frequency
Fig.24
THD + N － Frequency
12.5
0.6
VOLTAGE GAIN：GV1[dB]
12.0
VOLTAGE GAIN：GV2[dB]
Ta=Room temperature RL=8Ω f=1kHz Vin=-23dBV AV=8
0.2
Ta=Room temperature RL=8Ω f=1kHz Vin=-23dBV AV=8 2ndAMP Gain
11.5
-0.2
11.0
-0.6
10.5
11
2
5
10 10
-1.0
11
SUPPLY VOLTAGE：VCC[V]
Fig.26 Gain(1stAmp) － Power supply
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2 5 SUPPLY VOLTAGE：VCC[V]
Fig.27 Gain(2ndAmp) － Power supply
10 10
11/14
2011.08 - Rev.B
BH7824FVM,BH7826FVM
※C1:The capacitor connected to SUSPEND terminal 125 Ta=Room temperature VCC=3.6V RL=8Ω
Technical Note
※C1:The capacitor connected to SUSPEND terminal 125 Ta=Room temperature VCC=3.6V RL=8Ω C1=1.0μF
SHUT OUT TIME：Toff[msec]
WAKE UP TIME：Ton[msec]
100 75 50
100 75 50
C1=1.0μF
C1=0.47μF 25 C1=0.22μF 0 0 25 50 75 100 125 150 175
C1=0.47μF 25 C1=0.22μF 0 0 25 50 75 100 125 150 175
SUSPEND RESISTANCE：R1[kΩ]
Fig.28 Wake up time － SUSPEND terminal resistance Fig.29
SUSPEND RESISTANCE：R1[kΩ]
Shut out time － SUSPEND terminal resistance
0
POWER SUPPLY REJECTION RATIO： PSRR[dB]
POWER SUPPLY REJECTION RATIO： PSRR[dB]
-10 -20 -30 -40 -50 -60
10 10
Ta=Room temperature Vcc=3.6V RL=8Ω Vripple=100mVpp BTL RIN=600Ω
AV=8
0 -10 -20 -30 -40 -50 -60 -70
Ta=Room temperature Vcc=3.6V RL=8Ω Vripple=300mVpp BTL RIN=600Ω
AV=8
AV=2
AV=2
100 100
1000 1k
10000 10k
100000 100k
10 10
100 100
1000 1k
10000 10k
100000 100k
FREQUENCY：f[Hz]
Fig.30 Power Supply Rejection Ratio － Frequency
FREQUENCY:f[Hz]
Fig.31 Power Supply Rejection Ratio － Frequency
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12/14
2011.08 - Rev.B
BH7824FVM,BH7826FVM
●Notes for use
Technical Note
1) Numbers and data in entries are representative design values and are not guaranteed values of the items. 2) Although ROHM is confident that the example application circuit reflects the best possible recommendations, be sure to verify circuit characteristics for your particular application. Modification of constants for other externally connected circuits may cause variations in both static and transient characteristics for external components as well as this Rohm IC. Allow for sufficient margins when determining circuit constants. 3) Absolute maximum ratings Use of the IC in excess of absolute maximum ratings, such as the applied voltage or operating temperature range (Topr), 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 using the IC at times where the absolute maximum ratings may be exceeded. 4) GND potential Ensure a minimum GND pin potential in all operating conditions. Make sure that no pins are at a voltage below the GND at any time, regardless of whether it is a transient signal or not. 5) Thermal design Perform thermal design, in which there are adequate margins, by taking into account the permissible dissipation (Pd) in actual states of use. 6) Short circuit between terminals and erroneous mounting Pay attention to the assembly direction of the ICs. Wrong mounting direction or shorts between terminals, GND, or other components on the circuits, can damage the IC. 7) Operation in strong electromagnetic field Using the ICs in a strong electromagnetic field can cause operation malfunction.
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13/14
2011.08 - Rev.B
BH7824FVM,BH7826FVM
●Ordering part number
Technical Note
B
Part No.
H
7
Part No. 7824 7826
8
2
4
F
V
M
-
T
R
Package FVM: MSOP8
Packaging and forming specification TR: Embossed tape and reel
MSOP8
2.9±0.1 (MAX 3.25 include BURR)
8765
Tape
0.29±0.15 0.6±0.2
Embossed carrier tape 3000pcs TR
The direction is the 1pin of product is at the upper right when you hold
+6° 4° −4°
Quantity Direction of feed
4.0±0.2
2.8±0.1
( reel on the left hand and you pull out the tape on the right hand
1pin
)
1 234
1PIN MARK 0.475
0.9MAX
+0.05 0.145 −0.03 S
0.75±0.05
0.08±0.05
+0.05 0.22 −0.04 0.08 S 0.65
Direction of feed
(Unit : mm)
Reel
∗ Order quantity needs to be multiple of the minimum quantity.
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14/14
2011.08 - 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.
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R1120A
