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Número de pieza | BD5424EFS | |
Descripción | Analog Input / BTL Output Class-D Speaker Amplifier | |
Fabricantes | ROHM Semiconductor | |
Logotipo | ||
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Middle Power Class-D Speaker Amplifiers
Analog Input / BTL Output
Class-D Speaker Amplifier
BD5424EFS
No.10075EBT04
●Description
BD5424EFS is a 20W + 20W 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 91% (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 40W.
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 91% (10W + 10W output with 8Ω load), which is the highest grade in the industry and low heat-generation.
2) An output of 20W + 20W (17V, with 8Ω load) is allowed without an external heat radiator.
3) Driving a lowest rating load of 3.6Ω 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 (350kHz to 500kHz) 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
Supply voltage
Power dissipation
VCC
+20
V
Pin 7, 8, 15, 16, 29, 30, 37, 38, 40
(Note 1, 2)
Pd
2.0 W (Note 3)
4.5 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)
(Note 2)
(Note 3)
(Note 4)
A voltage that can be applied with reference to GND (pins 11, 12, 33, 34, and 43)
Pd and Tjmax=150℃ must not be exceeded.
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.
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 BD5424EFS
●Electrical characteristic curves (Reference data) – Continued
Technical Note
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MUTEX
Pin 20
10V/div
TM
Pin 26
5V/div
Speaker
output
2V/div
10msec/div
Vcc=12V MUTEX
RL =8 Ω
Pin 20
Po=500mW
fin=500Hz TM
Pin 26
Speaker
output
10V/div
5V/div
Vcc=12V
RL =8 Ω
Po=500mW
fin=500Hz
2V/div
10msec/div
Fig. 13 Wave form when Releasing Soft-mute
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 Fig. 16 Wave form on Instantaneous Power Interruption
(20msec / div)
(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 BD5424EFS
●Explanation of Pin Functions - Continued
No. Symbol Pin voltage
Pin description
21 SDX
Shutdown control pin
- H: Shutdown off
L: Shutdown on
Technical Note
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Internal equalizing circuit
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 |
Páginas | Total 18 Páginas | |
PDF Descargar | [ Datasheet BD5424EFS.PDF ] |
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