Service Manual
25
8.3 U850 (LD7575, Power Controller)
Pin
Symbol
I/O
Description
1
RT
This pin is to program the switching
frequency
2
COMP
I
Voltage feedback pin,By connecting a
photo-coupler to close the control loop
and achieve the regulation
3
CS
I
Current sence pin
4
GND
5
OUT
O
PWM output ,Gate drive output to drive
the external MOSFET
6
VCC
I
Power supply
7
NC
Unconnected pin
8
HV
I
PWM output
8.4 U1 ( INL816GN, CCFL Inverter controller IC)
Pin
Symbol
I/O
Description
1
DRV1
O
Driver output 1
2
VDDA
I
Supply voltage input
3
SEL
I
Select Signal for Push-Pull or
Half-Bridge Topology
4
RT1
I/O
Timing Resistor for Striking
Frequency
5
RT
I/O
Timing Resistor for Operation
Frequency
6
ENAPWM
I
Enable and PWM Dimming input
7
PID
I
Analog Dimming input
8
TIMER
I/O
Timing Capacitor for Delay Timer
9
ISEN1
I
Currentfeedback1
10
ISEN2
I
Currentfeedback2
11
VSEN
I
Voltage Feedback
12
OLP1
I
Open-Lamp Protection Sense1
13
OLP2
I
Open-Lamp Protection Sense2
14
SSTCMP
I/O
Soft-Start and Compensation
15
GNDA
Ground
16
DRV2
O
Driver output 2
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Страница 72: ...Service Manual 71 Attachment 3 PCB Layout Power inverter board Top Layer ...
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