Dell S1909WXf Service Manual page 20

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