ViewSonic VX712

- 25 –
ViewSonic Corporation
Confidential - Do Not Copy VX712
TL1451(U201): 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 Description Pin Symbol Description
1 CT
External timing capacitor
9 VCC
Power supply
2 RT
External timing resistor
10 2OUT
Output 2
3 1IN+
Positive input for error amplifier 1
11 2DTC
Output 2 dead time/soft start setting
4 1IN-
Positive input for error amplifier 2
12 2FBK
Error amplifier 2 output
5 1FBK
Error amplifier 1 output
13 2IN+
Positive input for error amplifier
6 1DTC
Output 1 dead time/soft start
setting
14 2IN-
Positive input for error amplifier
7 1OUT
Output 1
15 SCP
Timing latch setting
8 GND
Ground
16 REF
Reference voltage output (2.5v)