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21
Block Diagram
Pin
Name
Function
1
CT
This pin is to program the frequency of the low frequency timer. By connecting a capacitor to
ground to set the OLP delay time. And this pin can be used for latch mode protection. By pulling
this pin lower than 0.8 V, the controller will be entered latch mode until the AC power-on recycling.
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. A high quality ceramic capacitor (X7R) is
required for general applications (102pF at least).
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
8
HV
Connect this pin to positive terminal of bulk capacitor to provide the startup current for the
controller. When Vcc voltage trips the UVLO(on), this HV loop will be off to save the power loss on
the startup circuit.
Summary of Contents for VG2427WM - 24" LCD Monitor
Page 7: ...7 2 Specification...
Page 14: ...14 Pin Assignment...
Page 15: ...15...
Page 16: ...16...
Page 17: ...17...
Page 31: ...31 d Unit appears the following Fig writer completed 12 codes for example R3V080100001...
Page 32: ...32 6 Troubleshooting Flow Chart...
Page 44: ...44 9 PCB Layout Diagrams 9 1 Main Board...
Page 45: ...45...
Page 46: ...46 9 2 Power Board...
Page 47: ...47...
Page 48: ...48 9 3 Key Board 9 3 USB Board...
Page 49: ...49...
Page 50: ...50 10 Exploded Diagram and Exploded Parts List 10 1 EPL...