Pin NO. Symbol Function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
VCC2
V05-
V05+
V04+
V04-
V03+
V03-
V02+
V02-
V01+
V01-
VCC1
VIN1
VIN1-
VIN2
VIN2-
VIN3
VIN3-
REG-IN
REG-OUT
VREF-IN
VCC-S
VIN4-
VIN4
MUTE
S-GND
FWD
REV
GND
GND
Power for channels 3,4, and 5 (VCC1 and VCC-S short-circuited)
Loading output (-)
Loading output (+)
Output pin (+) for channel 4
Output pin (-) for channel 4
Output pin (+) for channel 3
Output pin (-) for channel 3
Output pin (+) for channel 2
Output pin (-) for channel 2
Output pin (+) for channel 1
Output pin(-) for channel 1
Power for channels 1 and 2 (BTL), (VCC-S and VCC2 short-circuited)
Non connection
Input pin for channel 1 (for gain control)
Non connection
Input pin for channel 2 (for gain control)
Non connection
Input pin for channel 3 (for gain control)
Regulator pin (External PNP base)
Regulator pin (External PNP collector)
Reference voltage input pin
Signal system power (VCC and VCC2 short-circuited)
Input pin for channel 4 (for gain control)
Non connection
Output ON/OFF, channels 1 to 4 (BTL AMP)
Signal system GND
5CH(VL0) Output change pin (FWD), Logic input for loading block
5CH(VL0) Output change pin (REV), Logic input for loading block
Frame GND
Frame GND
The center frame (FR) functions as power system GND. Set this to the minimum potential together with S-GND.
Short-circuit three pins of power system, VCC-S, VCC1, and VCC2, externally before use.
3.Pin function
LA6557-X(2/2)
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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