Boost Switch. FAN7340MX Datasheet

FAN7340MX Switch. Datasheet pdf. Equivalent

FAN7340MX Datasheet
Recommendation FAN7340MX Datasheet
Part FAN7340MX
Description LED Backlight Driving Boost Switch
Feature FAN7340MX; FAN7340 — LED Backlight Driving Boost Switch July 2013 FAN7340 LED Backlight Driving Boost Switch .
Manufacture Fairchild Semiconductor
Datasheet
Download FAN7340MX Datasheet




Fairchild Semiconductor FAN7340MX
July 2013
FAN7340
LED Backlight Driving Boost Switch
Features
Single-Channel Boost LED Switch
Internal Power MOSFET for PWM Dimming:
RDS(on) = 3.4 Ω at VGS=10 V, BVDSS=400 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 FAN7340 is a single-channel boost controller that
integrates an N-channel power MOSFET for PWM
dimming using Fairchild’s proprietary planar Double-
diffused MOS (D MOS) 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
FAN7340MX
Operating
Temperature
Range
-40°C to +125°C
Package
16-Lead, Small-Outline Integrated Circuit (SOIC)
Packaging
Method
Tape & Reel
© 2013 Fairchild Semiconductor Corporation
FAN7340 1.0.1
www.f airchildsemi.com



Fairchild Semiconductor FAN7340MX
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
Q
S
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
FAN7340 1.0.1
2
www.f airchildsemi.com



Fairchild Semiconductor FAN7340MX
Pin Assignments
VCC 1
DRV 2
GND 3
CS
4
REF 5
FAULT 6
RT 7
SENSE 8
16 BDIM
15 ADIM
14 CMP
13 OVP
12 ENA
10 DRAIN
9 DRAIN
Figure 2. Package Diagram
Pin Definitions
Pin #
Name
Description
1
VCC This pin is the supply voltage of the IC.
2
DRV This pin is the gate drive signal of the boost switch.
3
GND This pin is the ground of the IC.
This pin is for sensing the current flowing through an external MOSFET. It includes a built-in
4
CS
300 ns blanking time. The peak of the current flowing through the MOSFET is limited to this
pin voltage. Slope compensation of the boost controller can be programmed through the
series resistor of this pin.
5
REF This pin is the 5 V reference voltage pin. Maximum current capability is 3 mA.
6
FAULT
This pin is for indicating the fault signal. This pin is connected to the open drain. When OLP
protection is occurred, the FAULT pin is pulled HIGH.
7
RT
Oscillator frequency set of the boost switch (50 kHz ~ 300 kHz).
This pin is for sensing the current flowing through the LEDs. A s ensing resistor is connected
8
SENSE from this pin to ground. This pin is connected to the negative input of the internal error
amplifier.
9, 10
DRAIN Drain pin of PWM dimming power MOSFET.
12
ENA
Enable input pin. If voltage of this pin is higher than 1.22 V, IC is starting to operate. If the
voltage of this pin is lower than 1.15 V, the IC stops operating.
13
OVP
Over-voltage protection input pin. Output voltage of the boost circuit is connected to this pin
through a resistor divider circuit. If this pin voltage is higher than 3 V, OVP is triggered.
14
CMP
This pin is the error amplifier output. Typically, a compensation capacitor and resistor are
connected to this pin from the ground.
15
ADIM
This pin is for setting the current flowing through the LEDs. This pin is connected to the
positive inputs of the internal error amplifier. Linear voltage range of ADIM is 0.3 V~3.0 V.
16
BDIM
This pin is for the burst dimming signal. If this pin voltage is HIGH, the internal dimming
MOSFET is turned on. If this pin voltage is LOW, the dimming MOSFET is turned off.
Note :
1. Pin 11 is a No Connectpin (not shown in Figure 2).
© 2013 Fairchild Semiconductor Corporation
FAN7340 1.0.1
3
www.f airchildsemi.com





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