ViewSonic VG720 - 17" LCD Monitor Service Manual page 22

TL1451 (IC201): PWM control, voltage range for working: 3.6~35V, Has such functions
as short-voltage protection, Over-voltage protection, over-current protection and
etc. The function of each pin and the circuit diagram inside are as follows:
Pin Symbol
1 CT External timing capacitor
2 RT External timing resistor
3 1IN+ Positive input for error amplifier 1
4 1IN- Positive input for error amplifier 2
5 1FBK Error amplifier 1 output
Output 1 dead time/soft start
6 1DTC
setting
7 1OUT Output 1
8 GND Ground
ViewSonic Corporation
Description Pin Symbol
9 VCC
10 2OUT
11 2DTC
12 2FBK
13 2IN+
14 2IN-
15 SCP
16 REF
- 22 –
Confidential - Do Not Copy
Description
Power supply
Output 2
Output 2 dead time/soft start setting
Error amplifier 2 output
Positive input for error amplifier
Positive input for error amplifier
Timing latch setting
Reference voltage output (2.5v)
VG720