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LD7575 PS (IC901): The LD7575 is a current-mode PWM controller with excellent
power-saving operation. The embedded over voltage protection, over load protection
and the special green-mode control provide the solution for users to design a high
performance power circuit easily and etc. The function of each pin and the inside circuit
diagram are as follows:
PIN Descriptions:
Pin
Name
This pin is to program the switching frequency. By connection a resistor to ground
1
RT
to set the switching frequency.
Voltage feedback pin(same as the COMP pin in UC384X), By connecting a
2
COMP
photo-coupler to close the control loop and achieve the regulation.
3
CS
Current sense pin, connect to sense the MOSFET current
4
GND
Ground
5
OUT
Gate drive output to drive the external MOSFET
6
VCC
Supply voltage pin
7
NC
Unconnected Pin
Connect this pin to positive of bulk capacitor to provide the startup current for the
8
HV
controller, when Vcc voltage trips the UVLO(on), this HV loop will be off to save
the power loss on the startup circuit.
Block Diagram
ViewSonic Corporation
Function
17
Confidential - Do Not Copy
VA703b-1_VA703m-1
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