Ap1538, Pin descriptions, Block diagram – Diodes AP1538 User Manual
Page 3
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AP1538
18V 3A 300KHz BUCK CONVERTER
AP1538 Rev. 5
3 of 13
OCTOBER 2009
DS31451
©
Diodes Incorporated
Pin Descriptions
Pin Name Pin No.
Description
FB 1
Feedback
pin
EN
2
Power-off pin
H: Normal operation
(Step-down operation)
L: Step-down operation stopped
(All circuits deactivated)
OCSET
3
Add an external resistor to set max output current
V
CC
4
IC power supply pin
Output 5,
6
Switch Pin. Connect external inductor/diode here. Minimize trace
area at this pin to reduce EMI
V
SS
7, 8
GND Pin
Block Diagram
Oscillation
Circuit
Reference Voltage
Source with Soft Start
PWM-Switched
Control Circuit
+
-
Vss
V
EN
EN
90uA
OCSET
FB
Vcc
Thermal
Shutdown
Output
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