ViewSonic Corporation
Confidential - Do Not Copy
29
4.8 Key Parts Pin Assignment
4.8.1
IC802 (NCP1337, Power Control IC)
Pin
Symbol
I/O
Description
1 BO
I Brown
−
out and external triggering
2
FB
I
Sets the peak current setpoint
3
CS
I
Current sense input and overpower compensation adjustment
4 GND
IC
ground
5 DRV
O Output
driver
6 Vcc
I IC
supply
7 NC
N/A
N/A
8 HV
I High
−
voltage pin
4.8.2 IC501 (OZ9938GN, CCFL inverter controller IC)
Pin No.
Symbol
I/O
Description
1 DRV1 O
Drive
output
2
VDDA
I
Supply voltage input
3
TIMER
I
Timing capacitor to set striking time and shut down delay time
4 DIM I
Analog dimming or Internal LPWM dimming or external PWM pulse input
for dimming function
5
ISEN
I
Current sense feedback
6
VSEN
I
Voltage sense feedback
7
OVPT
I
Over-voltage/over-current protection threshold setting pin
8 NC
9 NC
10
ENC
I
ON/OFF control of IC
11 LCT I
Timing capacitor to set internal PWM dimming frequency and also a pin for
analog dimming selection
12
SSTCMP
I
Capacitor for soft start time and loop compensation
13
CT
I
Timing resistor and capacitor for operation and striking frequency
14
GNDA
Ground for analog signals
15 DRV2 O
Drive
output
16
PGND
Ground for power paths
4.8.3
U105(TSUM56AL-1)
Pin
Symbol
I/O
Description
1 NC
Not
connected
2 GND
Ground
3 NC
Not
connected
4 NC
Not
connected
V
X
193
5
wm-
3
Содержание VS11444
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