Texas Instruments LM3444 Evaluation Boards LM3444-120VFLBK/NOPB LM3444-120VFLBK/NOPB 사용자 설명서
제품 코드
LM3444-120VFLBK/NOPB
1
4
3
2
10
7
8
9
I
SNS
NC
GATE
NC
COFF
V
CC
NC
NC
5
6
FILTER
GND
LM3444 Device Pin-Out
WARNING
The ground connection on the evaluation board is NOT referenced
to earth ground. If an oscilloscope ground lead is connected to the
evaluation board ground test point for analysis and AC power is
applied, the fuse (F1) will fail open. The oscilloscope should be
powered via an isolation transformer before an oscilloscope
ground lead is connected to the evaluation board.
to earth ground. If an oscilloscope ground lead is connected to the
evaluation board ground test point for analysis and AC power is
applied, the fuse (F1) will fail open. The oscilloscope should be
powered via an isolation transformer before an oscilloscope
ground lead is connected to the evaluation board.
WARNING
The LM3444 evaluation board should not be powered with an open
load. For proper operation, ensure that the desired number of LEDs
are connected at the output before applying power to the
evaluation board.
load. For proper operation, ensure that the desired number of LEDs
are connected at the output before applying power to the
evaluation board.
6
LM3444 Device Pin-Out
Table 1. Pin Description 10-Pin VSSOP
Pin #
Name
Description
1
NC
No internal connection.
2
NC
No internal connection.
3
NC
No internal connection.
4
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.
OFF time of the switching controller.
5
FILTER
Filter input. A capacitor tied to this pin filters the error amplifier. Could also be used as an analog dimming
input.
input.
6
GND
Circuit ground connection.
7
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
GATE
Power MOSFET driver pin. This output provides the gate drive for the power switching MOSFET of the buck
controller.
controller.
9
V
CC
Input voltage pin. This pin provides the power for the internal control circuitry and gate driver.
10
NC
No internal connection.
4
AN-2082 LM3444 -120VAC, 8W Isolated Flyback LED Driver
SNVA454E – September 2010 – Revised May 2013
Copyright © 2010–2013, Texas Instruments Incorporated