Sony PRS-500 Service Manual page 30

PRS-500
– MAIN Board –
IC203 SN74LVC138APWR-12
A
1
B
2
3
C
4
G2A
G2B 5
G1 6
Y7
7
GND 8
IC402 XC9226A296MR, IC403 XC9226A1M6MR
R2
R1
VIN 1
VSS 2
R3
R4
CE/MODE(EN) 3
30
Phase
Compesation
+
+
-
-
Vref with
PWM/PFM
Soft Start,
Selector
CE
Logic
Current Feedback
Current Limit
Synch.
Logic
Buffer
Drive
Ramp Wave
Generator
OSC
CE/MODE
Control
Logic
VCC
16
Y0
15
Y1
14
13
Y2
Y3
12
Y4
11
Y5
10
Y6
9
5 Lx(SW)
4 Vout(CE)