LM3481EVAL National Semiconductor, LM3481EVAL Datasheet

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LM3481EVAL

Manufacturer Part Number
LM3481EVAL
Description
BOARD EVAL FOR LM3481
Manufacturer
National Semiconductor
Datasheets

Specifications of LM3481EVAL

Main Purpose
DC/DC, Step Up
Outputs And Type
1, Non-Isolated
Voltage - Output
12V
Current - Output
1.5A
Voltage - Input
3 ~ 11V
Regulator Topology
Boost
Frequency - Switching
300kHz
Board Type
Fully Populated
Utilized Ic / Part
LM3481
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-
© 2008 National Semiconductor Corporation
LM3481 Evaluation Board
Introduction
The LM3481 is a current mode, low side N channel FET con-
troller. 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:
Designat
C11
U1
C1
C2
C3
C4
C5
C6
C7
C8
C9
R1
R2
R3
R4
R5
or
Current Limit Sense Cap
Resistor Divider (Upper)
Resistor Divider (Lower)
Analog Input By. Cap
Output Filter Cap
Output Filter Cap
Decoupling Cap
Input Filter Cap
Input Filter Cap
Sense Resistor
Comp Resistor
Filter Resistor
Comp Cap
Comp Cap
Controller
Function
V
CC
Cap
300451
300 kHz, Vin = 5V, Vo = 12V, I
100 µF, 20V, D case, OxiCap
100 µF, 20V, D case, OxiCap
FIGURE 1. Circuit Diagram
100 µF, 16V, Y case, Ta
100 µF, 16V, Y case, Ta
.47 µF, 16V, X7R, 1206
2200 pF, 50V, 0805
0.12 µF, 25V, 0805
390 pF, 50V, 0805
LM3481MSOP-10
169 kΩ, 1%, 0805
1.37k, 1%, 0805
100Ω, 1%, 0805
1 µF, 25V, 1206
1 µF, 10V, 0805
20k, 1%, 0805
Bill of Materials
Description
20 mΩ, 1%
National Semiconductor
Application Note 1756
Maurice Eaglin
April 30, 2008
3V
V
0A
The circuit and bill of materials for this design are given below:
OUT
= 12V
V
I
OUT
IN
O
= 1.5A
11V
1.5A
TPSD107M016R0100
TPSD107M016R0100
TPSV107M020R0060
TPSV107M020R0060
CRCW0805100RFK
CRCW0805169KFK
CRCW080520K0FK
CRCW08051K37FK
WSL2512R0200FE
08055C391KAT2A
ECJ-3VB1C474K
ECJ-2YB1E124K
ECJ-2VB1H222K
0805ZC105KAT
12063C105KAT
Part Number
LM3481MM
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Panasonic
Panasonic
Panasonic
National
Vendor
Vishay
Vishay
Vishay
Vishay
Vishay
AVX
AVX
AVX
AVX
AVX
AVX
AVX
30045101

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LM3481EVAL Summary of contents

Page 1

... Comp Cap C9 V Cap CC C11 Analog Input By. Cap R1 Resistor Divider (Upper) R2 Resistor Divider (Lower) R3 Comp Resistor R4 Filter Resistor R5 Sense Resistor © 2008 National Semiconductor Corporation National Semiconductor Application Note 1756 Maurice Eaglin April 30, 2008 ≤ ≤ 11V 12V OUT ≤ ≤ ...

Page 2

Designat Function or R6 Freq. Adj. Resistor R7 UVLO Res. Div. R8 UVLO Res. Div. L1 Input Filter D1 Schottky Diode Q1 FET J1 Jumper VIN VIN Post Turret GND VIN GND Post Turret GND VOUT Post Turret VOUT VOUT ...

Page 3

FIGURE 3. Top Layer FIGURE 4. Bottom Layer 3 30045103 30045104 www.national.com ...

Page 4

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