LM3444_15 Datasheet, PDF (3/27 Pages) Texas Instruments – AC-DC Offline LED Driver

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5 Pin Configuration and Functions
DGS Package
10-Pin VSSOP
Top View
NC 1
NC 2
NC 3
COFF 4
FILTER 5
10 NC
9 V_CC
8 GATE
7 I_SNS
6 GND
LM3444
SNVS682D – NOVEMBER 2010 – REVISED DECEMBER 2015
D Package
8-Lead SOIC
Top View
NC 1
FILTER 2
GND 3
I_SNS 4
8 COFF
7 NC
6 VCC
5 GATE
NAME
COFF
FILTER
GATE
GND
ISNS
NC
VCC
PIN
VSSOP
4
5
8
6
7
1, 2, 3, 10
9
SOIC
8
2
5
3
4
1, 7
6
Pin Functions
I/O
DESCRIPTION
I
OFF time setting pin. A user set current and capacitor connected from the
output to this pin sets the constant OFF time of the switching controller.
Filter input. A low pass filter tied to this pin can filter a PWM dimming signal to
I
supply a DC voltage to control the LED current. Can also be used as an analog
dimming input. If not used for dimming connect a 0.1-µF capacitor from this pin
to ground.
O
Power MOSFET driver pin. This output provides the gate drive for the power
switching MOSFET of the buck controller.
—
Circuit ground connection
I
LED current sense pin. Connect a resistor from main switching MOSFET
source, ISNS to GND to set the maximum LED current.
—
No internal connection. Leave this pin open.
O
Input voltage pin. This pin provides the power for the internal control circuitry
and gate driver.
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