Datasheet
Low Consumption Power Class D Amplifier
9W+9W Analog Input
Class D Speaker Amplifier
BD28411MUV
General Description
BD28411MUV is 9W+9W stereo class D amplifier which
does not require an external heat sink.
This IC is incorporated with a precise oscillator to
generate multiple switching frequencies that can avoid
the AM radio interference. In addition, 2.1Ch audio
system can be realized by master and slave operation
without beat noise caused by interference between two
ICs. Furthermore, this IC realizes lower power
consumption during small power output, so this product
is most suitable for battery equipped speaker systems
such as wireless speakers.
Key Specifications
Supply Voltage Range:
4.5V to 13V
Speaker Output Power:
9W+9W (Typ)
(V
CC
=12V, R
L
=8Ω, PLIMIT=0V)
Total Harmonic Distortion Ratio:
0.03% (Typ) @Po=1W
(V
CC
=11V, R
L
=8Ω, PLIMIT=0V)
Crosstalk:
100dB (Typ)
PSRR:
55dB (Typ)
Output Noise Voltage:
-80dBV (Typ)
Standby Current:
0.1µA (Typ)
Operating Current:
16mA (Typ)
(No load or filter, No signal)
Operating Temperature Range:
-25°C to +85°C
Features
Analog Differential Input
Low Standby Current
Output Feedback Circuitry prevents sound quality
degradation caused by power supply voltage
fluctuation, achieves low noise and low distortion,
eliminates the need of large electrolytic-capacitors
for decoupling.
Power limit function
(Linearly-programmable)
Selectable switching frequency
(AM avoidance function)
Synchronization control is supported
(Selectable Master and Slave operation)
Parallel BTL (PBTL) is supported
Wide voltage range (V
CC
=4.5V to 13V)
High efficiency and low-heat-generation make the
system smaller, thinner, and more power-saving
Pop noise prevention during power supply ON/OFF
High reliability design by built-in protection circuits
- Overheat protection
- Under voltage protection
- Output short protection
- Output DC voltage protection
Small package (VQFN032V5050) achieves mount
area reduction
Wireless speaker, Small active speaker,
Portable audio equipment, etc.
PDX
Package
W(Typ) x D(Typ) x H(Max)
VQFN032V5050
5.00mm x 5.00mm x 1.00mm
Typical Application Circuit
SP ch1
(Lch)
SP ch2
(Rch)
Applications
OUT1N
OUT2N
MUTEＸ
OUT1P
OUT2P
BSP1N
GAIN_ BSP2N
MS_SEL
BSP1P
FSEL<2:0>
BSP2P
MUTEＸ
ERROR
PLIMIT
SYNC
Audio Source
Other
device
Figure 1. Typical Application Circuit
〇Product
structure : Silicon monolithic integrated circuit
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〇This
product has no designed protection against radioactive rays
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TEST
IN1N
IN2N
IN1P
IN2P
PDX
BD28411MUV
Pin Configuration
(TOP VIEW)
Datasheet
ERROR
VCCP1
32
31
30
29
28
NC
27
26
25
IN1P
1
BSP1P
VCCA
TEST
PDX
NC
24
OUT1P
IN1N
2
23
GNDP1
PLIMIT
3
22
OUT1N
GNDA
4
21
BSP1N
REGG
5
20
BSP2P
GAIN_MS_SEL
6
19
OUT2P
IN2P
7
18
GNDP2
IN2N
8
17
OUT2N
9
SYNC
10
FSEL0
11
FSEL1
12
FSEL2
13
MUTEX
14
NC
15
VCCP2
16
BSP2N
Figure 2. Pin Configuration
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BD28411MUV
Pin Description
Pin
No.
1
Pin Name
IO
Function
Datasheet
Internal Equivalent Circuit
IN1P
I
Positive input pin for Ch1
2
IN1N
I
Negative input pin for Ch1
3
PLIMIT
I
Power limit level setting pin
4
GNDA
-
GND pin for Analog signal
Internal power supply pin for Gate driver
Please connect a capacitor.
5
REGG
O
*The REGG terminal of BD28411MUV should not be
used as external supply. Therefore, do not connect
anything except the capacitor for stabilization and the
resistors for setting of GAIN_MS_SEL and PLIMIT.
6
GAIN_MS_SEL
I
Gain and Master/Slave mode Setting pin
7
IN2P
I
Positive input pin for Ch2
8
IN2N
I
Negative input pin for Ch2
9
SYNC
I/O
Clock input/output pin to synchronize
multiple class D amplifiers
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BD28411MUV
Pin Description – continued
10
Datasheet
10
FSEL0
I
PWM frequency setting pin
4
100k
11
FSEL1
I
PWM frequency setting pin
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
FSEL2
MUTEX
NC
VCCP2
BSP2N
OUT2N
GNDP2
OUT2P
BSP2P
BSP1N
OUT1N
GNDP1
OUT1P
BSP1P
VCCP1
VCCA
NC
NC
I
I
-
-
O
O
-
O
O
O
O
-
O
O
-
-
-
-
PWM frequency setting pin
Speaker output mute control pin
H: Mute OFF
L: Mute ON
Non connection
Power supply pin for Ch2 PWM signal
Please connect a capacitor.
Boot-strap pin of Ch2 negative PWM signal
Please connect a capacitor.
Output pin of Ch2 negative PWM signal
Please connect to output LPF.
GND pin for Ch2 PWM signal
Output pin of Ch2 positive PWM signal
Please connect to output LPF.
Boot-strap pin of Ch2 positive PWM signal
Please connect a capacitor.
Boot-strap pin of Ch1 negative PWM signal
Please connect a capacitor.
Output pin of Ch1 negative PWM signal
Please connect to output LPF.
GND pin for Ch1 PWM signal
Output pin of Ch1 positive PWM signal
Please connect to output LPF.
Boot-strap pin of Ch1 positive PWM signal
Please connect a capacitor.
Power supply pin for Ch1 PWM signal
Please connect a capacitor.
Power supply pin for Analog signal
Please connect a capacitor.
Non connection
Non connection
30
TEST
I
Test pin
Please connect to GND.
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BD28411MUV
Pin Description – continued
Datasheet
Power down setting pin
31
PDX
I
H: Active
L: Standby
Error flag pin
Please connect to pull-up resistor.
H: Normal
L: Error detected
*An error flag is outputted when Output Short
Protection, DC Voltage Protection, 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.
32
ERROR
O
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