ROHM BD5423MUV Technical data

Middle Power Class-D Speaker Amplifiers

Analog Input / BTL Output
Class-D Speaker Amplifier

BD5423MUV

●Description

BD5423MUV 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.
VQFN048V7070 7.0mm × 7.0mm × 1.0mm, pitch 0.5mm

●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.

No.10075EBT03

Parameter

Supply voltage VCC +20 V

Power dissipation Pd

Input voltage for signal pin VIN -0.2 ～ +7.2 V Pin 6, 7 (Note 1)

Input voltage for control pin VCONT -0.2 ～ Vcc+0.2 V Pin 28, 32 (Note 1)

Input voltage for clock pin VOSC -0.2 ～ +7.2 V Pin 31 (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 5, 18, 19, 42, and 43)
(Note 2) Pd and Tjmax=150℃ must not be exceeded.
(Note 3) 114.3mm × 76.2mm × 1.6mm FR4 2-layer glass epoxy board (Copper Area 5505mm2) installed.
If used under Ta=25℃ or higher, reduce 26.2mW for increase of every 1℃. The board is provided with thermal via.
(Note 4) 114.3mm × 76.2mm × 1.6mm FR4 4-layer glass epoxy board (Copper Area 5505mm2) installed.
If used under Ta=25℃ or higher, reduce 38.4mW for increase of every 1℃. The board is provided with thermal via.

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Symbol Ratings Unit Conditions

Pin 2, 14, 15, 22, 23, 38, 39, 46, 47
(Note 1, 2)

3.28 W (Note 3)

4.8 W (Note 4)

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2010.05 - Rev.B

BD5423MUV

●Operating conditions

The following values assume Ta =25℃. Check for latest values in delivery specifications.

Technical Note

Parameter

Supply voltage VCC +10～+16.5 V Pin 2, 14, 15, 22, 23, 38, 39, 46, 47

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.

Parameter

Whole circuit

Circuit current 1 (Sampling mode) ICC1 25 mA With no signal

Circuit current 2 (Muting mode) ICC2 10 mA MUTEX = “L”

Control circuit

“H” level input voltage VIH 2.3～12 V MUTEX, MS

“L” level input voltage VIL 0～0.8 V MUTEX, MS

Audio circuit

Symbol Ratings Unit Conditions

Symbol Limits Unit Conditions

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

Crosstalk CT 85 dB PO = 1W, Rg = 0Ω, BW = IHF-A

Output noise voltage
(Sampling mode)

Residual noise voltage
(Muting mode)

Internal sampling clock frequency FOSC 250 kHz 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.

NO 80 µVrms Rg = 0Ω, BW = IHF-A

V

NOM 1 µVrms Rg = 0Ω, BW = IHF-A, MUTEX = “L”

V

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2/16

2010.05 - Rev.B

BD5423MUV

●Electrical characteristic curves (Reference data)

(1) Under Stereo Operation(RL=8Ω)

100

Vcc=12V
RL=8Ω

10

BW=20～20kHz

1

THD+N (%)

0.1

0.01

0.001 0.01 0.1 1 10 100

OUTPUT POWER (W)

Fig. 3 Voltage gain - Frequency Fig. 4 Crosstalk - Frequency

Fig. 1 THD+N － Output power

40

35

30

25

20

15

10

VOLTAGE GAIN (dB)

Vcc=12V

L

=8Ω

R
Po=1W
L=33µH
C=0.47µF
Cｇ=0.1µF

5

0

10 100 1000 10000 100000

FREQUENCY (Hz)

6kHz

1kHz

100Hz

0

Vcc=12V

L

=8Ω

-20

R
fin=1kHz
BW=20～20kHz

-40

-60

CROSSTALK (dB)

-80

-100

0.001 0.01 0.1 1 10 100
OUTPUT POWER (W)

Fig. 5 Crosstalk - Output power Fig. 6 Output power - Power supply voltage

100

10

1

THD+N (%)

0.1

0.01
10 100 1000 10000 100000

CROSSTALK (dB)

-100

Fig. 2 THD+N － Frequency

0

-20

-40

-60

-80

10 100 1000 10000 100000

20

RL=8Ω
fin=1kHz

15

10

5

OUTPUT POWER (W)

0

8 1012141618

FREQUENCY (Hz)

FREQUENCY (Hz)

THD=10%

VCC (V)

Technical Note

Vcc=12V

L

=8Ω

R
Po=1W
BW=20～20kHz

Vcc=12V

L

=8Ω

R
Po=1W
BW=20～20kHz

THD=1%

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3/16

2010.05 - Rev.B

BD5423MUV

●Electrical characteristic curves (Reference data) – Continued

100

90
80
70
60
50
40
30

EFFICIENCY (%)

20
10

Vcc=10V

L

=8Ω

R
fin=1kHz

0

0 5 10 15 20

OUTPUT POWER (W/ch)

Fig. 7 Efficiency - Output power Fig. 8 Efficiency - Output power

100

100

90
80
70
60
50
40
30

EFFICIENCY (%)

20
10

0

0 5 10 15 20

OUTPUT POWER (W/ch)

3

90
80
70
60

2

Vcc=10V

Vcc=12V

50
40
30

EFFICIENCY (%)

20
10

Vcc=16.5V

L

=8Ω

R
fin=1kHz

0

0 5 10 15 20

OUTPUT POWER (W/ch)

Fig. 9 Efficiency - Output power Fig. 10 Current consumption - Output power

100

RL=8Ω

90

無信号時

Without signal

80
70
60

ICC (A)

1

0

0 5 10 15 20 25 30 35 40

TOTAL OUTPUT POWER (W)

0

-20

-40

-60

50
40

ICC (mA)

30
20
10

Sampling

Mute

0

8 1012141618

VCC (V)

Fig. 11 Current consumption - Power supply voltage Fig. 12 FFT of Output Noise Voltage

-80

-100

NOISE FFT (dBV)

-120

-140
10 100 1000 10000 100000

FREQUENCY (Hz)

Technical Note

Vcc=12V

L

R
fin=1kHz

Vcc=16.5V

Vcc=12V

L

R

=8Ω

Without signal

無信号時
BW=20～20kHz

=8Ω

RL=8Ω
fin=1kHz

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4/16

2010.05 - Rev.B

BD5423MUV

Technical Note

●Electrical characteristic curves (Reference data) – Continued

MUTEX

Pin 28

TM

Pin 34

10V/div

5V/div

Vcc=12V
R

=8

L

Ω

Po=500mW
fin=500Hz

MUTEX

Pin 28

TM

Pin 34

10V/div

5V/div

Speaker output

2V/div

10msec/div

Speaker output

2V/div

10msec/div

Fig. 13 Wave form when Releasing Soft-mute Fig. 14 Wave form when Activating Soft-mute

Fig. 15 Wave form on Instantaneous Power Interruption

(20msec / div)

Fig. 16 Wave form on Instantaneous Power Interruption

(2msec / div)

Fig. 17 Wave form on Output Power Limiter function

(Po = 5W)

Vcc=12V

=8

R

L

Ω

Po=500mW

fin=500Hz

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5/16

2010.05 - Rev.B

BD5423MUV

Technical Note

●Electrical characteristic curves (Reference data) – Continued

(2) Under Stereo Operation(RL=6Ω)

25

20

RL=6Ω
fin=1kHz

THD=10%

15

10

OUTPUT POWER (W)

5

0

8 1012141618

VCC (V)

Fig. 18 Output power - Power supply voltage

100

90
80
70
60
50
40
30

EFFICIENCY (%)

20
10

0

0 5 10 15 20 25

OUTPUT POWER (W/ch)

Vcc=10V

L

=6Ω

R
fin=1kHz

100

90
80
70
60
50
40
30

EFFICIENCY (%)

20
10

0

0 5 10 15 20 25

OUTPUT POWER (W/ch)

Vcc=12V

L

=6Ω

R
fin=1kHz

Fig. 19 Efficiency - Output power Fig. 20 Efficiency - Output power

100

90
80
70
60
50
40
30

EFFICIENCY (%)

20
10

0

0 5 10 15 20 25

OUTPUT POWER (W/ch)

Vcc=16.5V

L

R

=6Ω

fin=1kHz

4

3

Vcc=12V

Vcc=16.5V

Vcc=10V

2

ICC (A)

1

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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6/16

2010.05 - Rev.B