ViewSonic VX2262WM Service Manual - Page 23

LD7552DPS IC901, Function

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LD7552DPS (IC901): PWM control, high-voltage startup current. The circuit unit has functions such as over-current protection, over-voltage protection, output short-circuit protection and etc. The function of each pin and the inside circuit diagram are as follows: Pin Name Function 1 GND Ground Voltage feedback pin (same as the COMP pin in UC384X), By 2 COMP connecting a photo-coupler to close the control loop and achieve the regulation 3 VCC Supply voltage pin 4 RT This pin is to program the switching frequency. By connecting a resistor to ground to set the switching frequency. 6 NC Unconnected pin 7 VCC Supply voltage pin 8 OUT Gate drive output to drive the external MOSFET ViewSonic Corporation - 23 - Confidential - Do Not Cop VX2262wm/wmp

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- 23 –
ViewSonic Corporation
Confidential - Do Not Cop
VX2262wm/wmp
LD7552DPS (IC901):
PWM control, high-voltage startup current. The circuit unit has
functions such as over-current protection, over-voltage protection, output short-circuit
protection and etc. The function of each pin and the inside circuit diagram are as
follows
:
Pin
Name
Function
1
GND
Ground
2
COMP
Voltage feedback pin (same as the COMP pin in UC384X), By
connecting a photo-coupler to close the control loop and achieve the
regulation
3
VCC
Supply voltage pin
4
RT
This pin is to program the switching frequency. By connecting a resistor
to ground to set the switching frequency.
6
NC
Unconnected pin
7
VCC
Supply voltage pin
8
OUT
Gate drive output to drive the external MOSFET