APW7137
Pin Description
PIN.
FUNCTION
NO
1
NAME
LX
Switch pin. Connect this pin to inductor/diode here.
2
GND
Power and signal ground pin.
Feedback Input. The device senses feedback voltage via FB and regulate the voltage at 1.23V.
Connecting FB with a resistor-divider from the output that sets the output voltage in the range from
VIN to 30V.
3
FB
Enable Control Input. Forcing this pin above 1.0V enables the device. Forcing this pin below 0.4V to
shut it down. In shutdown, all functions are disabled to decrease the supply current below 1mA. Do
not left this pin floating.
4
5
EN
VIN
Main Supply Pin. Must be closely decoupled to GND with a 2.2mF or greater ceramic capacitor.
Block Diagram
VIN
UVLO
EN
LX
Gate Driver
Control Logic
Over-Temperature
Current
Limit
Current Sense
Amplifier
Protection
Slop
Compensation
S
Oscillator
Error
Amplifier
ICMP
GND
FB
COMP
EAMP
VREF
1.23V
Soft-Start
Copyright ã ANPEC Electronics Corp.
10
www.anpec.com.tw
Rev. A.4 - Oct., 2008
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
