LM3477EVAL National Semiconductor, LM3477EVAL Datasheet

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LM3477EVAL

Manufacturer Part Number
LM3477EVAL
Description
BOARD EVALUATION LM3477
Manufacturer
National Semiconductor
Datasheets

Specifications of LM3477EVAL

Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
3.3V
Current - Output
1.6A
Voltage - Input
4.5 ~ 15V
Regulator Topology
Buck
Frequency - Switching
500kHz
Board Type
Fully Populated
Utilized Ic / Part
LM3477
Lead Free Status / RoHS Status
Not applicable / Not applicable
Power - Output
-
© 2002 National Semiconductor Corporation
LM3477 Evaluation Board
Introduction
The LM3477 is a current mode, high-side N channel FET
controller. It is most commonly used in buck configurations,
as shown in Figure 1. All the power conducting components
of the circuit are external to the LM3477, so a large variety of
inputs, outputs, and loads can be accommodated by the
LM3477.
Component
C
C
R
R
C
C
R
R
C
C
R
C
OUT1
OUT2
Q1
R
D
FB1
FB2
IN1
IN2
L
DR
SN
C1
C2
SL
FF
C
120µF/20V
No connect
22µF/10V
22µF/10V
10µH, 3.8A
1.8kΩ
12nF/50V
No connect
5A, 30V
100V, 3A
20Ω
1kΩ
16.2kΩ
10.0kΩ
470pF
0.03Ω
AN200163
FIGURE 1. LM3477 Buck Converter
TABLE 1. Bill of Materials
Value
National Semiconductor
Application Note 1193
Mark Hartman
May 2001
The LM3477 evaluation board comes ready to operate at the
following conditions:
4.5V ≤ V
V
0A ≤ I
The circuit and BOM for this application are given below:
OUT
OUT
= 3.3V
IN
≤ 1.6A
≤ 15V
594D127X0020R2
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DO3316P-103 (Coilcraft)
CRCW08051821FRT1 (Vitramon)
VJ0805Y123KXAAT (Vitramon)
IRLMS2002 (IRF)
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CRCW080520R0FRT1 (Vitramon)
CRCW08051001FRT1 (Vitramon)
CRCW08051622FRT1 (Vitramon)
CRCW08051002FRT1 (Vitramon)
VJ0805Y471KXAAT (Vitramony)
WSL 2512 0.03Ω
20016301
Part Number
±
1% (Dale)
www.national.com

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LM3477EVAL Summary of contents

Page 1

... SL R 16.2kΩ FB1 R 10.0kΩ FB2 C 470pF FF R 0.03Ω SN © 2002 National Semiconductor Corporation National Semiconductor Application Note 1193 Mark Hartman May 2001 The LM3477 evaluation board comes ready to operate at the following conditions: 4.5V ≤ V ≤ 15V 3.3V OUT 0A ≤ ...

Page 2

Performance Following are some benchmark data taken from the circuit above on the LM3477 evaluation board. This evaluation board may also be used to evaluate a buck regulator circuit optimized for a different operating point evaluate a trade-off ...

Page 3

Increasing Current Limit The R resistor offers flexibility in choosing the ramp of the SL slope compensation. Slope compensation affects the mini- mum inductance for stability (see the Slope Compensation section in the LM3477 datasheet), but also helps determine the ...

Page 4

Layout Fundamentals FIGURE 7. LM3477 Evaluation Board PCB Layout (Top Side) FIGURE 8. LM3477 Evaluation Board PCB Layout (Bottom Side) www.national.com (Continued) 4 20016309 20016308 ...

Page 5

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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