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LM3481
V
IN
I
SEN
COMP
FB
AGND
UVLO
V
C
C
DR
PGND
FA/SYNC/SD
+
+
V
IN
V
OUT
R7
121 kÖ
R8
121 kÖ
C6
0.12 éF
C8
390 pF
R3
1.37 kÖ
R2
20 kÖ
R1
169 kÖ
R6
61.9 kÖ
R5
20
mÖ
C7
2.2 nF
1 éF
C1, C2
100 éF
L1
7.8 éH
C4, C5
100 éF
C9
D1
Q1
J1
C3
0.47 éF
R4
100Ö
User's Guide
SNVA304A–April 2008–Revised May 2013
AN-1756 LM3481 Evaluation Board
1 Introduction
The LM3481 is a current mode, low side N channel FET controller. It can be utilized in numerous
configurations including a Boost, Flyback or SEPIC (Single Ended Primary Inductor Converter). This
evaluation board demonstrates the flexibility of the LM3481 in a boost topology. The operating conditions
for the evaluation board are listed below:
3V ≤ V
IN
≤ 11V
V
OUT
= 12V
0A ≤ I
OUT
≤ 1.5A
The circuit and bill of materials for this design are given below:
Figure 1. Circuit Diagram
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1
SNVA304A–April 2008–Revised May 2013 AN-1756 LM3481 Evaluation Board
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