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Pin Assignments
VCC
DRV
GND
CS
REF
FAULT
RT
SENSE
1
2
3
4
5
6
7
8
16
15
14
13
12
10
9
BDIM
ADIM
CMP
OVP
ENA
DRAIN
DRAIN
Figure 2. Package Diagram
Pin Definitions
Pin #
1
2
3
4
5
6
7
8
9, 10
12
13
14
15
16
Name
VCC
DRV
GND
CS
REF
FAULT
RT
SENSE
DRAIN
ENA
OVP
CMP
ADIM
BDIM
Description
This pin is the supply voltage of the IC.
This pin is the gate drive signal of the boost switch.
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
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.
This pin is the 5 V reference voltage pin. Maximum current capability is 3 mA.
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.
Oscillator frequency set of the boost switch (50 kHz ~ 300 kHz).
This pin is for sensing the current flowing through the LEDs. A sensing resistor is connected
from this pin to ground. This pin is connected to the negative input of the internal error
amplifier.
Drain pin of PWM dimming power MOSFET.
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.
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.
This pin is the error amplifier output. Typically, a compensation capacitor and resistor are
connected to this pin from the ground.
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.
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 Connect ” pin (not shown in Figure 2).
? 2013 Fairchild Semiconductor Corporation
FAN7340 ? 1.0.1
3
www.f airchildsemi.com
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