Dell 320-7459 - S1909WXF - 19" LCD Monitor, Руководство по обслуживанию

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Service Manual
19
8.3 U830 (SG5841, PWM Power Controller)
Pin Symbol I/O Description
1 GND Ground
2 FB I Feedback, the FB pin provides the information
of the regulation. The PWM duty cycle is
controlled by FB
3 VIN I Start-up current input
4 RI I Reference setting, typical voltage 1.3V
5 RT N.C.(not connected)
6 SENSE I Current sense for over current protection
7 VDD I Power supply
8 GATE O PWM output
8.4 U1 (OZ9937, CCFL Inverter controller IC)
Pin Symbol I/O Description
1 DRV1 O Drive output1
2 VDDA I Supply voltage input
3 DIM I Internal LPWM dimming or external PWM pulse
input for dimming function
4 ISEN I Current sense feedback
5 PID I Analog dim input
6 RSTR I Resistor to set striking frequency
7 RT I Resistor to set operating frequency
compensation range
8 ENA I ON/OFF control of IC
9 VSEN I Voltage sense
10 OVPT I Over-voltage/over-current protecting threshold
setting
11 LCT I Timing capacitor to set internal PWM dimming
frequency
12 SSTCMP I Capacitor for soft start time and loop
compensation
13 CT I Timing resistor and capacitor for operation and
striking frequency
14 TIMER I Timing capacitor to set striking time and
shutdown delay time
15 GNDA I Ground
16 DRV2 O Drive output2