DVD-R7783
88
1
2
3
4
1
2
3
4
C
D
F
A
B
E
1. ON/OFF
2. VSS
3. VOUT
5. VIN
4. EXT
PWM Control
Circuit
V
ON / OFF
EXT
ON/OFF
VOUT
Oscillation
Circuit
Reference Voltage
Source with Soft Start
4
1
VIN 5
3
VSS
2
No.
Pin Name
Pin Function
1
ON/OFF
Power off pin
H = Normal operation (Step-down operation)
L = Step-down operation stopped (All circuits deactived)
2
VSS
Ground pin
3
VOUT
Output voltage monitoring pin
4
EXT
Connection pin for external trasistor
5
VIN
IC power supply pin
S-8520X15MC-LYA (MAIN ASSY : IC402)
• PWM Control Step-down Switching Regulator-controller
Pin Arrangement (topview)
Pin Function
Block Diagram