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4.8
Key Parts Pin Assignment
4.8.1 IC802 (TOP245Y or TOP246Y, Power Control IC)
Pin
Symbol
1
C
2
L
3
X
4
S
5
F
6
D
4.8.2 IC501 (OZ9938GN, CCFL inverter controller IC)
Pin No.
Symbol
1
DRV1
2
VDDA
3
TIMER
4
DIM
5
ISEN
6
VSEN
7
OVPT
8
NC
9
NC
10
ENC
11
LCT
12
SSTCMP
13
CT
14
GNDA
15
DRV2
16
PGND
4.8.3 U105(TSUM56AL-1)
Pin
Symbol
1
NC
2
GND
3
NC
4
NC
5
GND
6
NC
7
NC
8
AVDD_DC
9
NC
10
NC
11
GND
12
NC
ViewSonic Corporation
I/O
I
Control
I
Line Sense
I
External Current Limit
O
Source of MOSFET(GND)
I
Frequency
I
Drain of MOSFET
I/O
O
Drive output
I
Supply voltage input
I
Timing capacitor to set striking time and shut down delay time
Analog dimming or Internal LPWM dimming or external PWM
I
pulse input for dimming function
I
Current sense feedback
I
Voltage sense feedback
I
Over-voltage/over-current protection threshold setting pin
I
ON/OFF control of IC
Timing capacitor to set internal PWM dimming frequency and
I
also a pin for analog dimming selection
I
Capacitor for soft start time and loop compensation
I
Timing resistor and capacitor for operation and striking frequency
Ground for analog signals
O
Drive output
Ground for power paths
I/O
Not connected
Ground
Not connected
Not connected
Ground
Not connected
Not connected
I
ADC Power
Not connected
Not connected
Ground
Not connected
21
Description
Description
Description
Confidential - Do Not Copy
VG1921wm-2
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