ViewSonic VA503b-1 - Page 28

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 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)
ViewSonic Corporation VA503b-1_ VA503m-1
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