Datasheet
Middle Power Class-D Speaker Amplifier Series
20W+20W
Class D Speaker Amplifier for Digital Input
BD28620MUV
General Description
BD28620MUV is a Class D Speaker Amplifier designed for
Flat-panel TVs in particular for space-saving and
low-power consumption. This IC delivers an output power
of 20W+20W. This IC employs state-of-the-art Bipolar,
CMOS, and DMOS (BCD) process technology. With this
technology, the IC can achieve high efficiency. In addition,
the IC is packaged in a compact back-surface heat-sink
type power package to achieve low power consumption
and low heat generation and to eliminate need for external
heat-sink. With this package, total output power is only
34W as compared to 40W total output power of package
with external heat-sink This product satisfies all needs for
drastic downsizing, low-profile structures and powerful
high quality playback of sound systems.
Key Specifications
Supply Voltage:
8.5V to 24V
Speaker Output Power:
17W+17W (Typ)
(V
CC
=18V, R
L
=8Ω, Power Limit=OFF)
Total Harmonic Distortion: 0.08% (Typ) @P
O
=1W
(V
CC
=12V, R
L
=8Ω, Power Limit=10W)
Crosstalk:
90dB (Typ)
PSRR:
60dB (Typ)
Output Noise Voltage:
150μV
rms
(Typ)
Standby Current:
33μA (Typ)
Operating Temperature Range:
-25°C to +85°C
Package
VQFN024V4040
W(Typ) x D(Typ) x H(Max)
4.00mm x 4.00mm x 1.00mm
Features
1 Digital Audio Interface
2
I S format
SDATA: 16 / 20 / 24bit
LRCLK (f
S
): 32kHz / 44.1kHz / 48kHz
BCLK: 64f
S
(fixed)
MCLK: 256f
S
/ 512f
S
Automatic Identification)
Low supply current at RESET mode.
Output Feedback Circuitry which prevents decrease of
sound quality caused by change of power supply
voltage, achieves low noise and low distortion,
eliminates need for large electrolytic-capacitors
Variable Gain (17dB / 20dB / 26dB)
Wide power supply voltage range (8.5V to 24V)
High efficiency, low heat
Pop noise prevention at power supply ON/OFF
Soft Muting Technology
High reliability design by built-in protection circuits
- High temperature protection
- Under voltage protection
- Output short protection
- Output DC voltage protection
- Clock stop protection (MCLK, BCLK, LRCLK)
Small package (VQFN024V4040)
VQFN024V4040
Typical Application Circuit
SP ch1
(Lch)
SP ch2
(Rch)
BSP1P
OUT1P
BSP2P
OUT1N
OUT2P
BSP1N
OUT2N
LRCLK
BCLK
Applications
-
-
-
-
-
Flat Panel TVs (LCD, Plasma)
Home Audio (Sound Bar)
Amusement Equipment
Electronic Music Equipment
Desktop PC, etc.
MUTEＸ
ERROR
SDATA
PLIMIT
Digital Audio Source
Figure 1. Typical Application Circuit
○Product
structure：Silicon monolithic integrated circuit
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This
product has no designed protection against radioactive rays
1/46
TSZ02201-0C1C0E900100-1-2
16.Mar.2015 Rev.004
MCLK
RSTX
BSP2N
BD28620MUV
Pin Configuration
(TOP VIEW)
BSP2P
18
REGG
17
REGD
16
GNDA
15
VCCA
14
OUT1N
13
OUT2P
11
10
9
8
1
MCLK
2
SDATA
3
BCLK
4
LRCLK
5
PLIMT
6
RSTX
Figure 2. Pin Configuration
12
2/46
BSP1N
19
20
21
22
23
24
VCCP2
GNDP1
GNDP2
VCCP1
BSP2N
BSP1P
OUT2N
OUT1P
ERROR
MUTEX
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
TSZ02201-0C1C0E900100-1-2
16.Mar.2015 Rev.004
7
BD28620MUV
Pin Descriptions, I/O Equivalent Circuits
(Provided pin voltages are typical values)
Pin No.
1
2
3
4
7
Pin Name
MCLK
SDATA
BCLK
LRCLK
MUTEX
Pin Voltage
Pin Descriptions
Digital sound signal input pin
Internal Equivalent Circuit
14
0V
Speaker output mute control pin
H: Mute OFF
L: Mute ON
Gain setting pin
1,2,3,4,7
100k
15
14
5
16k
19.5k
5
PLIMT
0V
100k
15
13k
Reset pin
H: Reset OFF
L: Reset ON
6
RSTX
0V
14
6
57k
43k
15
8
9
10
11
12
13
OUT1P
BSP1P
VCCP1
GNP1
BSP1N
OUT1N
V
CC
to 0V
-
-
0V
-
V
CC
to 0V
Output pin of Ch1 positive PWM signal
Please connect to output LPF.
*If this pin is shorted to GND, the IC may be broken.
10
17
12
9
13
8
Boot-strap pin of Ch1 positive PWM signal
Please connect a capacitor.
Power supply pin for Ch1 PWM signal
Please connect a capacitor.
GND pin for Ch1 PWM signal
Boot-strap pin of Ch1 negative PWM signal
Please connect a capacitor.
Output pin of Ch1 negative PWM signal
Please connect to output LPF.
*If this pin is shorted to GND, the IC may be broken.
11
14
15
VCCA
GNDA
V
CC
0V
Power supply pin for Analog signal
Please connect a capacitor.
GND pin for Analog signal
－
－
Internal power supply pin for Digital circuit
Please connect a capacitor.
16
REGD
5.0V
14
*The REGD terminal of BD28620MUV should not be used as
external supply. Therefore, don't connect anything except for the
capacitor for stabilization.
16
500K
15
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
3/46
TSZ02201-0C1C0E900100-1-2
16.Mar.2015 Rev.004
BD28620MUV
Pin Descriptions, I/O Equivalent Circuits – continued
(Provided pin voltages are typical values)
Pin No.
Pin Name
Pin Voltage
Pint Descriptions
Internal power supply pin for Gate driver
Please connect a capacitor.
17
REGG
5.7V
*The REGG terminal of BD28620MUV should not be used as
external supply. Therefore, don't connect anything except for
the capacitor for stabilization.
Internal Equivalent Circuit
14
17
370K
15
18
BSP2P
-
Boot-strap pin of Ch2 positive PWM signal
Please connect a capacitor.
Output pin of Ch2 positive PWM signal
Please connect to output LPF.
*If this pin is shorted to GND, the IC may be broken.
20
17
18
22
19
23
19
20
21
22
23
OUT2P
VCCP2
GNDP2
BSP2N
OUT2N
V
CC
to 0V
V
CC
0V
-
V
CC
to 0V
Power supply pin for Ch2 PWM signal
Please connect a capacitor.
GND pin for Ch2 PWM signal
Boot-strap pin of Ch2 negative PWM signal
Please connect a capacitor.
Output pin of Ch2 negative PWM signal
Please connect to output LPF.
*If this pin is shorted to GND, the IC may be broken.
21
Error flag pin
Please connect pull-up resistor.
H: Normal
L: Error
*An error flag is outputted when Output Short Protection, DC
Voltage Protection in the speaker, and High Temperature
Protection are operated. This flag shows IC condition during
operation.
The numerical value of internal equivalent circuit is typical value, not guaranteed value.
14
500
24
ERROR
-
24
15
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
4/46
TSZ02201-0C1C0E900100-1-2
16.Mar.2015 Rev.004
BD28620MUV
Block Diagram
BSP2P
18
REGG
17
REGD
16
GNDA
15
VCCA
14
OUT1N
13
19
Driver
FET
2P
12
11
10
Driver
FET
1P
Driver
FET
1N
feedback
OUT2P
Output Short Protection
Output DC Voltage Protection
High Temperature Protection
Under Voltage Protection
Clock Stop Protection
PWM
Modulator
BSP1N
VCCP2
20
21
22
23
24
GNDP1
GNDP2
feedback
VCCP1
BSP2N
Driver
FET
2N
×4 Over
Sampling Digital Filter
BSP1P
OUT2N
9
8
7
OUT1P
ERROR
I
2
S I/F
Control I/F
MUTEX
1
MCLK
2
SDATA
3
BCLK
4
LRCLK
5
PLIMT
6
RSTX
Figure 3. Block Diagram
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/46
TSZ02201-0C1C0E900100-1-2
16.Mar.2015 Rev.004
开关电源学习小组
