Texas Instruments LM3401 Hysteretic PFET Controller for High Power LED Drive Evaluation Module LM3401EVAL/NOPB LM3401EVAL/NOPB Datenbogen
Produktcode
LM3401EVAL/NOPB
C535676
Connector
P1
P6
Anode of First LED
(LED+)
(LED-)
Cathode of Last LED
HYS
ILIM
DIM
CS
H
G
SNS
VIN
LM3401
C3
L1
GND
R1
R2
R3
Q1
D1
VIN: 4.5V to 35V
GND
DIM
LED+
LED-
C2
7
6
5
4
3
2
1
8
+
C1
Connecting the LED Array
Figure 1. Complete LM3401 Demo Board Schematic
Table 1. LED Current Setting Resistors
LED
R1
R3
R1 power dissipation
average current
(typical current limit)
340 mA
(1)
0.59
Ω
(1)
24.9 k
Ω
(1.5A)
(1)
68 mW
700 mA
0.29
Ω
47 k
Ω
(2.8A)
142 mW
1.0A
0.20
Ω
68 k
Ω
(3.9A)
200 mW
(1)
Default value
3
Connecting the LED Array
The LM3401 demo board includes a female 6-pin SIP connector as well as two turret posts for the
cathode and anode connections of the LED array. These are labeled “LED+” and “LED-“. Either
connection can be used.
cathode and anode connections of the LED array. These are labeled “LED+” and “LED-“. Either
connection can be used.
shows the pinout of the SIP connector.
Figure 2. LED Connection
2
AN-1657 LM3401 Demo Board
SNVA254C – August 2007 – Revised April 2013
Copyright © 2007–2013, Texas Instruments Incorporated