FAN73402 Datasheet, PDF (2/16 Pages) Fairchild Semiconductor – LED Backlight Driving Boost Switch

Block Diagram
OVP
20μs Delay
3V
OVP
100mV
ADIM
TSD
1μs
+
Delay
ADIM*4
1.4~4V
Current
Sense
-
OCP
POR
640µs at 200kHz
Auto-Restart
PWM
gm
0.3~3V
SQ
R
1/4
-
+
CMP
100mV
-
0.5V ⁺
Burst
Operation
OLP
R
SQ
Dim off
PWM
Gate
Driver
Slope
5k
Compensation
CLK+LEB
4V
16 Steps
Internal Soft-Start ^{3ms at 200kHz}
Switch Off
0.5V
GND
45µA
Oscillator
VCC
ENA
UVLO 9V
1.22V
-
+
Hys. 70mV
Hys. 1.0V
REF
5V, max. 3mA
Voltage Reference
& Internal Bias
OLPi
Dim off
PWM
BDIM
OLP
5μs Delay
40.96ms
at 200kHz
Debounce
Time
OLPi
Current
Sense
0.2V
PWM
End of Soft-Start
BDIM
Figure 1. Internal Block Diagram
FAULT
DRV
CS
RT
Drain
SEN
© 2012 Fairchild Semiconductor Corporation
FAN73402 • 1.0.0
2
www.fairchildsemi.com