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PDF BD5423AEFS Data sheet ( Hoja de datos )
| Número de pieza | BD5423AEFS | |
| Descripción | Analog Input / BTL Output Class-D Speaker Amplifier | |
| Fabricantes | ROHM Semiconductor | |
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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, high-
quality 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
Supply voltage
Power dissipation
Symbol
VCC
Pd
Ratings
+20
2.0
4.5
Unit Conditions
V
Pin 7, 8, 15, 16, 29, 30, 37, 38, 40
(Note 1, 2)
W (Note 3)
W (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
℃
Maximum junction temperature
Tjmax
+150
℃
(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.
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
1/17
2010.05 - Rev.B
1 page  
BD5423AEFS
●Electrical characteristic curves (Reference data) – Continued
Technical Note
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MUTEX
Pin 20
TM
Pin 26
10V/div
5V/div
Vcc=12V MUTEX
RL =8 Ω
Pin 20
Po=500mW
fin=500Hz TM
Pin 26
10V/div
5V/div
Vcc=12V
RL =8 Ω
Po=500mW
fin=500Hz
Speaker
Output
2V/div
10msec/div
Fig. 13 Wave form when Releasing Soft-mute
Speaker
Output
2V/div
10msec/div
Fig. 14 Wave form when Activating Soft-mute
VCCA
VHOLD
Pin 27
TM
Pin 26
Speaker
Output
5V/div
5V/div
2V/div
20msec/div
VCCA
Vcc=12V
RL =8 Ω
VHOLD
Pin 27
Po=500mW TM
fin=3kHz Pin 26
Speaker
Output
5V/div
5V/div
2V/div
Vcc=12V
RL =8 Ω
Po=500mW
fin=3kHz
2msec/div
Fig. 15 Wave form on Instantaneous Power Interruption
(20msec / div)
Fig. 16 Wave form on Instantaneous Power Interruption
(2msec / div)
Speaker
Output
Soft Clip
5V/div
Soft Clip
200μsec/div
Vcc=12V
RL =8 Ω
Po=5W
THD+n=10%
fin=1kHz
R2=91k Ω
R3=22k Ω
Fig. 17 Wave form on Output Power Limiter function
(Po = 5W)
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
5/17
2010.05 - Rev.B
5 Page 
BD5423AEFS
●Explanation of Pin Functions (continued)
No. Symbol Pin voltage
Pin description
20 MUTEX
Audio mute control pin
- H: Mute off
L: Mute on
Technical Note
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Internal equalizing circuit
21, 22
N.C.
-
N.C. pin
Nothing is connected with IC internal circuit.
23 OSC
Sampling clock signal input/output pin
- When using two or more sampling clocks,
connect via a capacitor.
24 MS
Master/Slave switching pin
-
Switching of master/slave functions on a
sampling clock signal.
H: Slave operation
L: Master operation
25 ROSC
5.6V
Internal PWM sampling clock
frequency setting pin
Usually the pin is used open.
To adjust an internal sampling clock
frequency, connect a resister.
26 TM
0～5V
Audio muting constant setting pin
Connect a capacitor.
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
11/17
2010.05 - Rev.B
11 Page | ||
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