BD28412MUV Datasheet, PDF (23/44 Pages) Rohm – 9W+9W Analog Input Class D Speaker Amplifier

BD28412MUV
Datasheet
3. Application Information
(1) Application Circuit Example 1 (Stereo BTL, V_CC=4.5V to 11V)
Overshoot of output PWM differs depending on the board, etc. Ensure that it is lower than absolute maximum
ratings. If it exceeds the absolute maximum ratings, snubber circuit need to be added, the circuit example is shown
on the next page.
Audio
Source
3.3V
R32
10kΩ
C27B
4.7µF
VCC
C27A
0.1µF
C29
0.1µF
VCC
C26A
0.1µF
C26B
10µF
C1
1µF
IN1P ₁
REGG _C2
IN1N ₂
1µF
R3A
PLIMIT ₃
R3B
REGG
GNDA ₄
REGG
C5
1µF
REGG ₅
R6A _{GAIN_MS_SEL}
R6B
6
C7
1µF
IN2P ₇
IN2N ₈
C8
1µF
32
31
30
29
28
27
26
25
PROTECT
CONTROL
I/F
LDO
PWM
PLIMIT
GAIN
LDO
PWM
DRIVER
FET
DRIVER
FET
DRIVER
FET
DRIVER
FET
REGG
OSC
CONTROL I/F
REGG
9
10
11
12
13
14
15
16
24 _OUT1P
GNDP1
23
22 ^OUT1N
21 ^BSP1N
C25
2.2µF
L24A
15µH
C24A
1µF
C22A
1µF
C21
2.2µF
L22A
15µH
20 ^BSP2P
19 _OUT2P
18 ^GNDP2
17 ^OUT2N
C20
2.2µF
L19A
15µH
C19A
1µF
C17A
1µF
L17A
15µH
C16
2.2µF
RL=8Ω/6Ω
RL=8Ω/6Ω
VCC
C15A
0.1µF
C15B
10µF
Figure 44. Application Circuit 1
BOM 1 (Stereo BTL, V_CC=4.5V to 11V)
Parts
Qty.
Parts No.
1
R3A
1
R3B
Resistor
1
R6A
1
R6B
1
R32
4
C1, C2, C7, C8
1
C5^{(Note 14)}
3
C15A, C26A, C27A^{(Note 14)}
2
C15B, C26B^{(Note 14)}
Capacitor
4
C16, C20, C21, C25^{(Note 14)}
4
C17A, C19A, C22A, C24A
1
C27B^{(Note 14)}
1
C29^{(Note 14)}
Inductor
4
L17A, L19A, L22A, L24A
(Note 14) Please place it near pin as much as possible.
Description
Ref. Function Description (4)Power Limit Function
Ref. Function Description (2)Gain and Master/Slave setting
10kΩ, 1/16W, J(±5%)
1µF, 16V, B(±10%)
1µF, 16V, B(±10%)
0.1µF, 25V, B(±10%)
10µF, 25V, B(±10%)
2.2µF, 16V, B(±10%)
1µF, 25V, B(±10%)
4.7µF, 25V, B(±10%)
0.1µF, 16V, B(±10%)
15µH, 2.1A, ±20%
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TSZ02201-0C1C0E900620-1-2
21.Sep.2016 Rev.003