ViewSonic VA702-1 Service Manual page 26

4 NC
5 Cable Detect
7. Key Parts Pin Assignment
7.1 IC802 (TOP246Y, Power Control IC)
Pin Symbol
1 C
2 L
3 X
4 S
5 F
6 D
7.2 IC501 (OZ9910G, CCFL inverter controller IC)
Pin No. Symbol
1 NDRV4
2 PGND
3 NDRV2
4 GNDA
5 CT
6 LCT
7 ADJ
8 ENA
9 VSEN
10 CMP_SST
11 ISEN
12 VREF
13 VIN
14 HSB
15 PDRV3
16 PDRV1
7.3 U104 (TSU16AK)
Pin Symbol
1 LVBOM
2 GND
3 BYPASS
4 NC
5 NC
6 BUSTYPE
7 NC
8 NC
9 NC
10 GND
11 VDDP
12 NC
13 NC
14 NC
15 NC
16 NC
ViewSonic Corporation
9 +5V(from PC)
10 GND
I/O
I Control
I Line Sense
I External Current Limit
O Source of MOSFET(GND)
I Frequency
I Drain of MOSFET
I/O
Bottom MOSFET gate drive output in dual forward
O
converter
High-current power ground
Bottom MOSFET gate drive output in dual forward
O
converter
Low-current signal ground
I Timing capacitor of high frequency oscillator
I Timing capacitor of set LPWM frequency
I Control command input –DC
I Enable input
I
Voltage sense feedback
I
Soft start and loop compensation capacitor
I
Current sense feedback
O
Reference voltage output
I
Supply voltage for IC
I
High side driver buffer output
O
Top MOSFET gate drive output in dual forward converter
O
Top MOSFET gate drive output in dual forward converter
I/O
B-Link Negative LVDS Differential Data
O
Ground
For External Bypass Capacitor
Not connected
Not connected
IN Low : Serial bus; High : Direct bus
Not connected
Not connected
Not connected
Ground
O Digital Output Power
Not connected
Not connected
Not connected
Not connected
Not connected
23
14 VSYNC
15 Data clock line (SCL)
Description
Description
Description
Confidential - Do Not Copy
VA702-1_VA702b-1