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- 21 –
LD7552BPS (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
Summary of Contents for va1616w-8
Page 9: ... 9 3 Front Panel Function Controls And Indicators ...
Page 18: ... 18 ...
Page 23: ... 23 ...
Page 37: ... 37 ...
Page 38: ... 38 Sep2 Inpute the S N and execute Enter ...
Page 39: ... 39 ...
Page 40: ... 40 Sep3 Key the Enter and write the data ...
Page 41: ... 41 Sep4 If ddc program OK and show data compare ok ...
Page 42: ... 42 5 7 Packing Procedure ...
Page 43: ... 43 6 Troubleshooting Flow Chart ...
Page 54: ... 54 ViewSonic Corporation Confidential Do Not Cop VA1616w MAIN BOARD PCB BUTTON VIEW ...
Page 56: ... 56 9 3 KEY BOARD TOP VIEW KEY BOARD BUTTON VIEW ...
Page 57: ... 57 10 Exploded Diagram And Spare Parts List ...
Page 59: ... 59 Packing For Shipping ...