ViewSonic VA2016W Service Manual - Page 42

ViewSonic Corporation, IC802 NCP1203, Pin No. Pin name, Function, Pin Description, The IC ground - 2 drivers

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6.5 IC802 (NCP1203) Pin No. Pin name Function Pin Description This pin lets you adjust the level at which the cycle Adjust he skipping peak 1 Adj skipping process takes place. Shorting this pin to current ground,permanently disables the skip cycle feature. By connecting an optocoupler to this pin,the pead Sets the peak current current setpoints is adjusted accordingly to the 2 FB setpoint ouput power demand.Skip cycle occurs when FB falls below Vpin1. This pin senses the primary current and routes it to 3 CS current sense input the internal comparator via and L.E.B. 4 Gnd The IC ground 5 Drv Driving pulses The driver's output to an external MOSFET. 6 Vcc Supplies the IC This pin is connected to an External bulk capacitor 7 Nc This unconnected pin ensures adepuate creepage distance. Ensure a clean and Connected to the high-voltage rail, this pin injects a 8 HV lossless start-up constant current into the Vcc capacitor during the sequence start-up sequence ViewSonic Corporation 39 Confidential - Do Not Copy VA2016w-2

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39
ViewSonic Corporation
Confidential - Do Not Copy
VA2016w-2
6.5
IC802 (NCP1203)
Pin No. Pin name
Function
Pin Description
1
Adj
Adjust he skipping peak
current
This pin lets you adjust the level at which the cycle
skipping process takes place. Shorting this pin to
ground,permanently disables the skip cycle feature.
2
FB
Sets the peak current
setpoint
By connecting an optocoupler to this pin,the pead
current setpoints is adjusted accordingly to the
ouput power demand.Skip cycle occurs when FB
falls below Vpin1.
3
CS
current sense input
This pin senses the primary current and routes it to
the internal comparator via and L.E.B.
4
Gnd
The IC ground
5
Drv
Driving pulses
The driver's output to an external MOSFET.
6
Vcc
Supplies the IC
This pin is connected to an External bulk capacitor
7
Nc
This unconnected pin ensures adepuate creepage
distance.
8
HV
Ensure a clean and
lossless start-up
sequence
Connected to the high-voltage rail, this pin injects a
constant current into the Vcc capacitor during the
start-up sequence