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Power Amplifier (LA4550)
The power amplifier is a two channel amplifier which connected in BTL mode. The following table shows the
pin function of the LSI.
Pin. No.
Terminal
1
NC
2
OUT2
3
BS2
4
NF2
5
IN2
6
DC
7
PREGND
8
IN1
9
NF1
10
BS1
11
OUT1
12
VCC
G0
PWGND
G1
TAB
CIRCUIT DESCRIPTION
In/Out
---
Not used
Out
Channel 2 Output
---
Terminal for a bootstrap capacitor
In
Negative feedback input
In
Channel 2 Input
---
Terminal for a decoupling capacitor
Ground (0V) source
In
Channel 1 Input
In
Negative feedback input
---
Terminal for a bootstrap capacitor
Out
Channel 2 Output
In
+9V source
GND
In Ground (0V source)
GND
In Ground (0V source)
— 3 —
Function
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