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7
HOLD
8
VDD
8.3 U850 (LD7552, PWM Power Controller)
Pin
Symbol
1
GND
2
COMP
3
VCC
4
RT
5
NC
6
CS
7
VCC
8
OUT
8.4 U1 (INL836, CCFL Inverter controller IC)
Pin
Symbol
1
ENA_SST_CMP
2
RT
3
GNDA
4
DRV2
5
DRV1
6
VDDA
7
DIM
8
ISEN
rising edge of the clock input, while output data is shifted
out on the
Falling edge of the clock input.
I/O
To temporarily stop serial communication with SPI flash
memory without resetting the device.
P
To provide power supply.
I/O
Ground
I
Voltage feedback pin(same as the COMP pin in
UC384X), 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
Enable, Soft Start Time and Compensation for current
I
Timing Resistor to provide Striking and Operating
I
I
O
O
I
I
I
Description
Description
and voltage
Frequency
Ground
N MOSFET Drive Output
N MOSFET Drive Output
Supply Voltage
Dimming Voltage Adjusting Input
Current Sense Feedback
19
Service Manual
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