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FAN7346 Datasheet(PDF) 3 Page - Fairchild Semiconductor

Part No. FAN7346
Description  4-Channel LED Current Balance Controller
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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FAN7346 Datasheet(HTML) 3 Page - Fairchild Semiconductor

 
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© 2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN7346 • 1.0.0
3
Pin Configuration
Figure 2. Package Diagram
Pin Definitions
Pin #
Name
Description
1
OVR
This pin is input for over-voltage regulation.
2
FB
This pin is for feedback of minimum drain voltage of external current regulation switch. This
pin is externally connected to the cathode of the feedback photo-coupler.
3
CMP
This pin is for compensation of the minimum channel voltage feedback.
4
VMIN
Synchronous signal of channel drain-voltage. If multiple controllers are operated, this pin
must be tied together. In single operation, this pin must be open.
5
FO
This pin is fault output. In case of OLP, SLP, and OCP; this pin is connected to ground.
6
PWM4
PWM dimming signal input pin of channel 4.
7
PWM3
PWM dimming signal input pin of channel 3.
8
PWM2
PWM dimming signal input pin of channel 2.
9
PWM1
PWM dimming signal input pin of channel 1.
10
ENA
Enable input.
11
ADIM
This pin is for the reference voltage of the LED current feedback voltage.
12
SLPR
This pin is for setting the reference of channel over-voltage protection (short-LED protection).
13
REF
This pin is the reference output. Voltage is 5V; current capability is 3mA.
14
VCC
This pin is the supply voltage of the controller.
15
FB4
This pin is for current sensing feedback of channel 4.
16
VDD
Internal gate driver power supply voltage. A large capacitor (1µF~2µF) must be connected
from this pin to ground.
17
OUT4
This pin is for gate signal to the external balance FET of channel 4.
18
CH4
This pin is for drain voltage of the external balance FET of channel 4.
19
FB3
This pin is for current sensing feedback of channel 3.
20
OUT3
This pin is for gate signal to the external balance FET of channel 3.
21
CH3
This pin is for drain voltage of the external balance FET of channel 3.
22
FB2
This pin is for current sensing feedback of channel 2.
23
OUT2
This pin is for gate signal to the external balance FET of channel 2.
24
CH2
This pin is for drain voltage of the external balance FET of channel 2.
25
FB1
This pin is for current sensing feedback of channel 1.
26
OUT1
This pin is for gate signal to the external balance FET of channel 1.
27
CH1
This pin is for drain voltage of the external balance FET of channel 1.
28
GND
This pin is the ground.


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