ROHM BH7824FVM-TR

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.
BH7824FVM
BH7826FVM
Input type
Unbalanced input
Balanced input
2.4 ~ 5.5
2.6 ~ 5.5
Supply voltage(V)
●Absolute maximum ratings(Ta=25℃)
Parameter
Symbol
Limits
Unit
VCCmax.
6.0
V
Pd
470(*1)
mW
Operating temperature
Topr
-30 ~ +85(*2)
℃
Storage temperature
Tstg
-55 ~ +125
℃
Supply voltage
Power dissipation
*1
*2
Reduced by 4.7 mW/C at 25C 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.
Power dissipation Pd[mW]
500
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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© 2011 ROHM Co., Ltd. All rights reserved.
1/14
2011.08 - Rev.B
Technical Note
BH7824FVM,BH7826FVM
●Operating conditions
(Ta=25℃)
Ratings
Parameter
Supply voltage
BH7824FVM
BH7826FVM
2.4V ~ 5.5V
2.6 ~ 5.5
* Note: This IC is not designed to be radiation-resistant.
●Electrical characteristics
Parameter
(Unless otherwise noted Ta=25℃, Vcc=3.6V, f=1kHz, RL=8Ω)
Limits(Typ.)
Symbol
Unit
BA7824FVM
BA7826FVM
Conditions
Circuit current 1
ICC1
3.5
3.5
mA
No signal , Active mode
Circuit current 2
ICC2
0
0
μA
No signal, Suspend mode
Voltage gain 1
GV1
+11.5
+11.5
dB
VIN=-20dBV,1st Op-amp gain
Voltage gain 2
GV2
0
―
dB
2nd Op-amp gain
Maximum output voltage1
VOM1
+6.0
+6.0
dBV
DSTN=1% ,BTL *1
Maximum output voltage2
VOM2
―
+5.1
dBV
VCC=3.4V,DSTN=1%,BTL *1
Output distortion
DSTN
0.07
0.2
%
Output noise level
VNO
-94
-94
dBV
No signal, SE Active mode *2
Suspend attenuation
GS
-107
-107
dBV
VIN=-20dB,V BTL *2
Bias setting voltage
VBIAS
1.8
1.8
V
3pin DC voltage
Suspend hold voltage / H
VSH1
VCC×0.8 ~ VCC
2.0 ~ VCC
V
Active mode, Hold voltage
Suspend hold voltage / L
VSH2
0 ~ 0.5
0 ~ 0.5
V
Suspend mode, Hold voltage
VIN=-20dB,V SE *1
*1 : B.W.=0.4 ~ 30kHz
*2 : DIN AUDIO
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© 2011 ROHM Co., Ltd. All rights reserved.
2/14
2011.08 - Rev.B
Technical Note
BH7824FVM,BH7826FVM
●Measurement circuit
0.1μ
0.1μ
1 A/S
8
2
7
3
1.0μ
V
8
6
BIAS
5
4
V
22k
600
100k
0.1μ
100μ
Fig.2 BH7824FVM
100k
VIN 2 0.1μ 22k
600
1
8
2 A/S
7
3
VI N1
0.1μ
6
BI AS
1μ
22k
600
100μ
8
V
0.1μ
VCC
4
5
V
100k
Fig.3 BH7826FVM
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3/14
2011.08 - Rev.B
Technical Note
BH7824FVM,BH7826FVM
●Block diagram
SUSPEND CTRL 1 A/S
8 SP OUT 2
7 GND
BIAS OUT 2
BIAS IN 3
SP IN
BIAS
4
6
VCC
5 SP OUT 1
Fig.4 BH7824FVM
8 SP OUT 2
SP IN 2 1
7 GND
SUSPEND CTRL 2 A/S
BIAS
3
6 VCC
BIAS
SP IN 1 4
5 SP OUT 1
Fig.5 BH7826FVM
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© 2011 ROHM Co., Ltd. All rights reserved.
4/14
2011.08 - Rev.B
Technical Note
BH7824FVM,BH7826FVM
●Equivalent circuit
BH7824FVM
Pin
No.
1
Pin name
SUSPEND CTRL
BH7826FVM
Equivalent circuit
Pin name
Equivalent circuit
1k
50k
01
50k
01
SP IN2
100k
2
BIAS OUT
30k 487k
30k
3
BIAS IN
30k 57k
30k
02
SUSPEND CTRL
03
BIAS IN
04
SP IN1
05
SP OUT1
02
100k
30k 150k
4
SP IN
5
SP OUT1
6
VCC
－
VCC
－
7
GND
－
GND
－
8
SP OUT2
1k
03
30k
SP OUT2
08
1k
04
05
08
Note: Numerical values in figures are design values, and do not guarantee ratings.
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5/14
2011.08 - Rev.B
Technical Note
BH7824FVM,BH7826FVM
●Application circuit
BH7824FVM
SUSPEND
01 A/S
08
02
07
SPEAKER
03
SP_IN(L+R)
06
BIAS
04
05
R1
R2
Cf
Fig.6
BH7826FVM
Cf
R2
SP_IN 2 0.1μ R1
SUSPEND
01
08
02
07
1μ
1μ
03
SPEAKER
06
BIAS
SP_IN 1 0.1μ
04
05
R1
R2
Cf
Fig.7
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© 2011 ROHM Co., Ltd. All rights reserved.
6/14
2011.08 - Rev.B
Technical Note
BH7824FVM,BH7826FVM
●Functions and Settings of external components
【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
R2
R1
[dB]
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
10kΩ ≦ R1 ≦120kΩ
Rf
47kΩ ≦ R2 ≦120kΩ
Cf
Gain＞+6dB
Cf≦560pF
0＜Gain≦+6dB
fcL
Cf≦270pF
≧ 4kHz
fcL
④Cb1 (Cb2 is only BH7824FVM.)
The capacitors stabilize DC bias voltage.
BH7824FVM
BH7826FVM
Cb1
1µF
1µF
Cb2
0.1µF
―
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
③
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)
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© 2011 ROHM Co., Ltd. All rights reserved.
7/14
2011.08 - Rev.B
Technical Note
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
16Ωspeaker
BH7824FVM / 26FVM
BH7824FVM
Co ≦ 100pF
Co ≦ 47pF
Co
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
1
C
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
Technical Note
BH7824FVM,BH7826FVM
●Typical characteristics(BH7824FVM)
2
Ta=Room temperature
RL=8Ω
SUSPEND=VCC
8
CIRCUIT CURRENT：ICCS[uA]
CIRCUIT CURRENT：ICCA[mA]
10
6
4
2
0
1.5
Ta=Room temperature
RL=8Ω
SUSPEND=0V
1
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
1.5
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
1200
700
Ta=Room
temperature
f=1kHz
THD+N=1.0%
400～30kBPF
AV=8
800
600
POWER DISSIPATION：PD [mW]
1000
OUTPUT POWER：Po[mW]
2
RL=12Ω
RL=8Ω
600
400
RL=16Ω
200
RL=8Ω
500
400
300
Ta=Room
temperature
VCC=5.0V
f=1kHz
400～30kBPF
THD+N≤1.0%
RL=16Ω
200
100
0
0
1.5
2
2.5
3
3.5
4
4.5
SUPPLY VOLTAGE：VCC[V]
5
0
5.5
200
400
600
800
1000
1200
OUTPUT POWER：Po[mW]
Fig.13 Output power － Power supply
Fig.14 Power dissipation － Outpu power
350
POWER DISSIPATION：PD [mW]
300
250
RL=8Ω
200
Ta=Room
temperature
VCC=3.6V
f=1kHz
400～30kBPF
THD+N≤1.0%
150
RL=16Ω
100
50
0
0
100
200
300
400
500
600
OUTPUT POWER：Po[mW]
Fig.15 Power dissipation － Outpu power
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9/14
2011.08 - Rev.B
Technical Note
BH7824FVM,BH7826FVM
Ta=Room
temperature
VCC=3.6V
f=1kHz
RL=8Ω
400～30kBPF
THD+N≤1.0%
AV=8
100
OUTPUT POWER：Po[mW]
OUTPUT POWER：Po[mW]
1000
Ta=Room
temperature
VCC=3.6V
f=1kHz
RL=8Ω
400～30kBPF
THD+N≤1.0%
AV=2
1000
10
100
10
1
1
-40
-35
-30
-25
-20
-15
-25
-10
-20
-5
0
5
Fig.17 Output Power － Input level
Fig.16 Output Power － Input level
10.00
Ta=Room
temperature
VCC=5.0V
RL=8Ω
f=1kHz
AV=8
400～30kBPF
1.00
Ta=Room
temperature
VCC=5.0V
RL=8Ω
f=1kHz
AV=2
400～30kBPF
THD+N[%]
THD+N[%]
1.00
-10
INPUT LEVEL：Vin[dBV]
INPUT LEVEL：Vin[dBV]
10.00
-15
0.10
0.01
0.10
1m
0.001
100m
0.1
10m
0.01
11
0.01
10
10
1m
0.001
10m
0.01
OUTPUT POWER：Po[W]
100m
0.1
11
10
10
OUTPUT POWER：Po[W]
Fig.18 THD + Noise － Output Power
Fig.19
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
10.00
Ta=Room
temperature
VCC=3.6V
RL=8Ω
f=1kHz
AV=2
400～30kBPF
THD+N[%]
THD+N[%]
1.00
THD + Noise － Output Power
0.10
0.10
0.01
0.01
0.001
1m
Fig.20
0.01
10m
0.1
100m
1 1
1010
OUTPUT POWER：Po[W]
THD + Noise － Output Power
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© 2011 ROHM Co., Ltd. All rights reserved.
1m
0.001
10m
0.01
100m
0.1
11
10
10
OUTPUT POWER：Po[W]
Fig.21
10/14
THD + Noise － Output Power
2011.08 - Rev.B
Technical Note
BH7824FVM,BH7826FVM
Ta=Room
temperature
VCC=5.0V
RL=8Ω
Po=300mW
AV=8
WIDE BAND
1
THD+N[%]
THD+N[%]
1
0.1
0.01
Ta=Room
temperature
VCC=5.0V
RL=8Ω
Po=300mW
AV=2
WIDE BAND
0.1
0.01
10
100
100
1000
1k
10000
10k
10
100000
100k
100
FREQUENCY：f[Hz]
Fig.23
Ta=Room
temperature
VCC=3.6V
RL=8Ω
Po=150mW
AV=8
WIDE BAND
THD + N － Frequency
Ta=Room
temperature
VCC=3.6V
RL=8Ω
Po=150mW
AV=2
WIDE BAND
1
THD+N[%]
THD+N[%]
1
0.1
0.1
0.01
10
10
100
100
1000
1k
10000
10k
10
10
100000
100k
100
100
FREQUENCY：f[Hz]
Fig.24
THD + N － Frequency
Fig.25
VOLTAGE GAIN：GV2[dB]
11.5
11.0
11
2
5
10
10
SUPPLY VOLTAGE：VCC[V]
Fig.26 Gain(1stAmp) － Power supply
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© 2011 ROHM Co., Ltd. All rights reserved.
10000
10k
100000
100k
THD + N － Frequency
Ta=Room
temperature
RL=8Ω
f=1kHz
Vin=-23dBV
AV=8
0.6
Ta=Room
temperature
RL=8Ω
f=1kHz
Vin=-23dBV
AV=8
12.0
1000
1k
FREQUENCY：f[Hz]
12.5
VOLTAGE GAIN：GV1[dB]
100k
100000
10
10
10.5
10k
10000
FREQUENCY：f[Hz]
Fig.22 THD + N － Frequency
0.01
1k
1000
0.2
-0.2
2ndAMP Gain
-0.6
-1.0
11
2
5
SUPPLY VOLTAGE：VCC[V]
10
10
Fig.27 Gain(2ndAmp) － Power supply
11/14
2011.08 - Rev.B
Technical Note
BH7824FVM,BH7826FVM
※C1:The capacitor connected to SUSPEND terminal
※C1:The capacitor connected to SUSPEND terminal
125
Ta=Room
temperature
VCC=3.6V
RL=8Ω
100
SHUT OUT TIME：Toff[msec]
WAKE UP TIME：Ton[msec]
125
C1=1.0μF
75
50
C1=0.47μF
25
C1=0.22μF
Ta=Room
temperature
VCC=3.6V
RL=8Ω
100
C1=1.0μF
75
50
C1=0.47μF
25
C1=0.22μF
0
0
0
25
50
75
100
125
150
0
175
SUSPEND RESISTANCE：R1[kΩ]
Fig.29
Ta=Room
temperature
Vcc=3.6V
RL=8Ω
Vripple=100mVpp
BTL
RIN=600Ω
-20
-30
AV=8
-40
75
100
125
150
175
AV=2
-50
-60
Shut out time － SUSPEND terminal resistance
Ta=Room
temperature
Vcc=3.6V
RL=8Ω
Vripple=300mVpp
BTL
RIN=600Ω
0
POWER SUPPLY REJECTION RATIO：
PSRR[dB]
POWER SUPPLY REJECTION RATIO：
PSRR[dB]
-10
50
SUSPEND RESISTANCE：R1[kΩ]
Fig.28 Wake up time － SUSPEND terminal resistance
0
25
-10
-20
AV=8
-30
-40
AV=2
-50
-60
-70
10
10
100
100
1000
1k
10000
10k
100000
100k
FREQUENCY：f[Hz]
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100
100
1000
1k
10000
10k
100000
100k
FREQUENCY:f[Hz]
Fig.30 Power Supply Rejection Ratio － Frequency
© 2011 ROHM Co., Ltd. All rights reserved.
10
10
Fig.31 Power Supply Rejection Ratio － Frequency
12/14
2011.08 - Rev.B
Technical Note
BH7824FVM,BH7826FVM
●Notes for use
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
Technical Note
BH7824FVM,BH7826FVM
●Ordering part number
B
H
7
Part No.
8
2
4
Part No.
7824
7826
F
V
M
-
Package
FVM: MSOP8
T
R
Packaging and forming specification
TR: Embossed tape and reel
MSOP8
<Tape and Reel information>
2.8±0.1
4.0±0.2
8 7 6 5
0.6±0.2
+6°
4° −4°
0.29±0.15
2.9±0.1
(MAX 3.25 include BURR)
Tape
Embossed carrier tape
Quantity
3000pcs
Direction
of feed
TR
The direction is the 1pin of product is at the upper right when you hold
( reel on the left hand and you pull out the tape on the right hand
)
1 2 3 4
1PIN MARK
1pin
+0.05
0.145 −0.03
0.475
0.08±0.05
0.75±0.05
0.9MAX
S
+0.05
0.22 −0.04
0.08 S
Direction of feed
0.65
Reel
(Unit : mm)
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14/14
∗ Order quantity needs to be multiple of the minimum quantity.
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.
Thank you for your accessing to ROHM product informations.
More detail product informations and catalogs are available, please contact us.
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http://www.rohm.com/contact/
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R1120A