BM28723AMUV
(Note 23)
Application Circuit Example3 (Monaural BTL output
, RL=4Ω, VCCP1, VCCP2≤14V)
μ-con
L25
10μH
GNDP1
DVDD DVDD
10μF 3.3μF
C27
10kΩ
R32
10kΩ
R31
C26
32
31
30
29
28
NC
27
26
25
REG_G BSP1P OUT1P
1μF
C25A
SP ch1
(Lch)
I2C BUS
Address
Select
REG_G
DVDD
VSS
GNDP1
VCCP1
Control
I/F
1
2
3
4
5
6
7
8
2 wire I/F
24
23
22
21
20
19
18
17
ADDR
VCCP1
10μF
C24
Driver
FET 1P
1μF
C21A
BCLK
BCLK
LRCLK
SDATA
R2 0Ω
GNDP1
BSP1N
GNDP1
I2S/LJ/RJ
I/F
LRCLK
Driver
FET 1N
Digital
Audio
Source
R3 0Ω
3.3μF
C22
10μH
L21
SDATA
8 Times
Over-
Sampling
Digital
Filter
OUT1N
OUT2P
R40Ω
PWM
Modulator
Audio
DSP
TEST1
VSS
R6
C6B
0.027μF
Driver
FET 2P
1.5kΩ
PLL
BSP2P
PLL
VSS
C6A
C7
GNDP2
2700pF
REG15
VSS
REG15
Driver
FET 2N
1μF
GNDP2
VCCP2
Protection
VSS
LRCLK
DGND
BCLK
DVDD
TEST2
TEST3SDATAO
BSP2N OUT2N
15 16
NC
14
9
10
11
12
13
0Ω
R12
R13
VSS
VSS
1μF
C10
DVDD(3.3V)
μ-con
VSS
10kΩ
DVDD
SDATAO
ERRORX
Figure 72
Description
Parts
Qty
Parts No.
Inductor
2
1
2
4
1
1
1
2
1
2
2
1
L21, L25
R6
10μH / 3.8A / (±20%)
1.5kΩ / 1/16W / F(±1%)
10kΩ / 1/16W / J(±5%)
0Ω / 1/10W / J(±5%)
10kΩ / 1/16W / J(±5%)
R31, R32
R2, R3, R4, R12
R13
Resistor
C6A
2700pF / 6.3V / B(±10%)
0.027μF / 6.3V / B(±10%)
1.0μF / 50V / B(±10%)
10μF / 35V / B(±10%)
3.3μF / 16V / B(±10%)
1.0μF / 10V / B(±10%)
10μF / 16V / B(±10%)
C6B
C21A, C25A
C24
Capacitor
C22, C26
C7, C10
C27
Caution 1: If the impedance characteristics of the speakers at high-frequency range increase rapidly, the LSI might not have stable operation in the resonance
frequency range of the LC filter. Therefore, consider adding damping-circuit, etc., depending on the impedance of the speaker.
Caution 2: Though this LSI has a short protection function, when short to VCC or GND after the LC filter, over-current occurs during short protection function operation.
Be careful about over/undershoot which exceeds the maximum standard ratings because back electromotive force of the inductor will occur which
sometimes leads to LSI destruction.
The Inductor must be used to the coil with large margin of rated DC current (saturation current). When the short-circuit of the speaker output (after the LC
filter) to VCC or GND occurs when the coil with small rated DC current is used, LSI destruction might be caused. Because the coil causes the magnetic
saturation behavior, it instantaneously passes the heavy-current to LSI.
Caution 3: Overshoot of output PWM differs according to the board or coupling capacitor of VCC, and etc. Check to ensure that it is lower than absolute maximum
ratings. If it exceeds the absolute maximum ratings, snubber circuit must need to be added.
Caution 4: This circuit constant is value with ROHM evaluation board, and adjustment of the constant may be necessary for the application board. Must carry out
enough evaluations.
(Note 23) Register setting of 0xF2=0x0A and 0xF8=0x01 is necessary at the time of start-up (in state of MUTEX=Low).
(Refer to “Monaural output setting”.)
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