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Fairchild Semiconductor Electronic Components Datasheet

FAN73402MX Datasheet

LED Backlight Driving Boost Switch

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July 2013
FAN73402
LED Backlight Driving Boost Switch
Features
Single-Channel Boost LED Switch
Internal Power MOSFET for PWM Dimming:
RDS(ON)=1.0 Ω at VGS=10 V, BVDSS=200 V
Current-Mode PWM Control
Internal Programmable Slope Compensation
Wide Supply Voltage Range: 10 V to 35 V
LED Current Regulation: ±1%
Programmable Switching Frequency
Analog and PWM Dimming
Wide Dimming Ratio: On Time=10 µs to DC
Cycle-by-Cycle Current Limiting
Thermal Shutdown: 150°C
Open-LED Protection (OLP)
Over-Voltage Protection (OVP)
Over-Current Protection (OCP)
Error Flag Generation (for External Load Switch)
Internal Soft-Start
16-Lead SOIC Package
Description
The FAN73402 is a single-channel boost controller that
integrates an N-channel power MOSFET for PWM
dimming using Fairchild’s proprietary planar Double-
diffused MOSFET (DMOS) technology.
The IC operates as a constant-current source for driving
high-current LEDs.
It uses Current Mode control with programmable slope
compensation to prevent subharmonic oscillation. The IC
provides protections including: open-LED protection,
over-voltage protection, and direct-short protection for
high system reliability.
The IC internally generates a FAULT signal with delay if
an abnormal LED string condition occurs. PWM dimming
and analog dimming functions can be implemented
independently. Internal soft-start prevents inrush current
flowing into output capacitor at startup.
Applications
LED Backlight for LCD TV
LED Backlight for LCD Monitor
LED Lighting
Ordering Information
Part Number
Operating
Temperature
Range
FAN73402MX
-40°C to +125°C
Package
Packing Method
16-Lead, Small-Outline Integrated Circuit (SOIC)
Tape & Reel
© 2013 Fairchild Semiconductor Corporation
FAN73402 1.0.1
www.f airchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

FAN73402MX Datasheet

LED Backlight Driving Boost Switch

No Preview Available !

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
4V
16 Steps
Internal Soft-Start 3ms at 200kHz
Switch Off
OLP
R
SQ
Dim off
PWM
Gate
Driver
Slope
5k
Compensation
CLK+LEB
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
© 2013 Fairchild Semiconductor Corporation
FAN73402 1.0.1
2
www.f airchildsemi.com


Part Number FAN73402MX
Description LED Backlight Driving Boost Switch
Maker Fairchild Semiconductor
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FAN73402MX Datasheet PDF






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