ROHM BD5423AEFS

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.
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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.
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© 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
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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
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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)
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© 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.
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© 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.
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© 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.
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(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.
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© 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.
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© 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.
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© 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
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© 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
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© 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.
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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
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© 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/
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© 2010 ROHM Co., Ltd. All rights reserved.
R1010A