Texas Instruments LM3444 Evaluation Boards LM3444-230VFLBK/NOPB LM3444-230VFLBK/NOPB Datenbogen
Produktcode
LM3444-230VFLBK/NOPB
1
4
3
2
10
7
8
9
I
SNS
NC
GATE
NC
COFF
V
CC
NC
NC
5
6
FILTER
GND
3
2
1
6
7
8
VCC
NC
NC
GND
COFF
FILTER
4
5
I
SNS
GATE
SNVS682C – NOVEMBER 2010 – REVISED MAY 2013
Connection Diagrams
Figure 1. 10-Pin VSSOP (Top View)
Figure 2. 8-Lead SOIC (Top View)
See DGS Package
See D Package
PIN DESCRIPTIONS
VSSOP
SOIC
Name
Description
1
1
NC
No internal connection. Leave this pin open.
2
NC
No internal connection. Leave this pin open.
3
NC
No internal connection. Leave this pin open.
4
8
COFF
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.
constant OFF time of the switching controller.
5
2
FILTER
Filter input. A low pass filter tied to this pin can filter a PWM dimming signal to 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
0.1µF capacitor from this pin to ground.
control the LED current. Can also be used as an analog dimming input. If not used for dimming connect a
0.1µF capacitor from this pin to ground.
6
3
GND
Circuit ground connection.
7
4
ISNS
LED current sense pin. Connect a resistor from main switching MOSFET source, ISNS to GND to set the
maximum LED current.
maximum LED current.
8
5
GATE
Power MOSFET driver pin. This output provides the gate drive for the power switching MOSFET of the
buck controller.
buck controller.
9
6
V
CC
Input voltage pin. This pin provides the power for the internal control circuitry and gate driver.
10
7
NC
No internal connection. Leave this pin open.
2
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