FAN7318A Fairchild Semiconductor, FAN7318A Datasheet - Page 2

• Manufacturer Part Number: FAN7318A
• Description: Fan7318a ? Lcd Backlight Inverter Drive Ic
• Manufacturer: Fairchild Semiconductor

© 2009 Fairchild Semiconductor Corporation
FAN7318A • 1.0.0
Block Diagram
OLR1
OLR2
ADIM
OLP1
OLP2
CMP
CT
min. 0.5V
max. 2V
OLP max.
Negative
Dimming
Analog
/Full Wave
Detector
Recifier
Min. &
Min. & Max.
/Full or Half
Max.
Detector
Rectifier
Wave
V
Error. Amp. source
current change
ref
52μA burst
sink current on
Min.
Max.
On @ striking
Open-Lamp Regulation
Striking/normal
+
-
OLP min.
0.7V/0.5V
1.34V
1.34V
0.3V
2.2V
Error Amp.
2V
+
-
+
-
-
+
+
-
Short-Lamp Protection
Over-Voltage Protection
-
+
3.5V
+
-
Figure 1. Internal Block Diagram
Gm Amp.
High CMP Protection
disable @ striking
Error. Amp. source
current change
+
-
17 Pulses Counter
If ENA>2.5V, OLP & SLP disable.
If ENA<2.1V, OLP & SLP enable.
And OLR<1.4V
0μA
3μA
Striking off
-
+
High_CMP
OLP
150μs
Delay
2
Protection
Oscillator
52μA burst
sink current on
Hys. 0.45V
-
+
Voltage Reference
& Internal Bias
TSD 150
50µA @ OVP,SLP
2µA @ OLP.CMP high
3V/1V @ striking/normal
UVLO 5.5V
o
C
Output Driver
Control
Logic
+
-
5V, max. 3mA
+
disable @ striking
-
min. 0.5V
max. 2V
1.35V
200k
www.fairchildsemi.com
TIMER
OUTA
OUTB
BDIM
GND
ENA
REF
BCT
VIN