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8.3 U850 (LD7552B, PWM Power Controller)
Pin
Symbol
1
GND
2
COMP
3
VCC
4
RT
5
NC
6
CS
7
VCC
8
Out
8.4 U1 (INL833, CCFL Inverter controller IC)
Pin
Symbol
1
VSEN
2
SSTCMP
3
CT
4
RT
5
GNDA
6
PDR2
7
GNDP
8
NDR2
9
NDR1
10
PDR1
11
VDDA
12
TIMER
13
PWM
14
ISEN
15
OVPT
16
ENA
I/O
Ground
I
Voltage feedback pin,by connecting a photo-coupler
to close the control loop and achieve the regulation
I
Supply voltage pin
I
This pin is to program the switching frequency. By
connecting a resistor to ground to set the switching
frequency.
Unconnected pin
I
Current sense pin,connect to sense the MOSFET
current.
I
Supply voltage pin
O
Gate drive output to drive the external MOSFET
I/O
I
Voltage Sense Feedback
I
Capacitor for Soft-Start and loop Compensation
I
Timing Resistor and Capacitor for Operation and
Striking Frequency
I
Timing Resistor for Striking Frequency
Signal Ground
O
High Side Driver Output2
Power Ground
O
Low Side Driver Output2
O
Low Side Driver Output1
O
High Side Driver Output1
I
Input Power Pin
I
Timing Capacitor for Delay Timer
I
Ecternal PWM Dimming Input
I
Current Sense Feedback
I
Over-Voltage Protection Threshold Voltage
I
IC Enable/Disable
19
Service Manual
Description
Description
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