LM5001NISOEVAL National Semiconductor, LM5001NISOEVAL Datasheet

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LM5001NISOEVAL

Manufacturer Part Number
LM5001NISOEVAL
Description
BOARD EVALUATION FOR LM5001
Manufacturer
National Semiconductor
Datasheets

Specifications of LM5001NISOEVAL

Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
5V
Current - Output
1A
Voltage - Input
16 ~ 42V
Regulator Topology
Flyback
Frequency - Switching
250kHz
Board Type
Fully Populated
Utilized Ic / Part
LM5001
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Power - Output
-
Lead Free Status / Rohs Status
Not Compliant
© 2009 National Semiconductor Corporation
LM5001 Non-Isolated
Flyback Evaluation Board
Introduction
The LM5001 non-isolated flyback evaluation board is de-
signed to provide the design engineer with a fully functional
non-isolated flyback power converter based on Current Mode
Control to evaluate the LM5001 switching regulator IC. The
evaluation board provides a 5V output with 1A current capa-
bility. The input voltage ranges from 16V to 42V. The design
operates at 250KHz, a good compromise between conver-
sion efficiency and solution size. The printed circuit board
consists of 2 layers of 2 ounce copper on FR4 material with
a thickness of 0.062 inches. This application note contains the
evaluation board schematic, Bill-of-Materials (BOM) and a
quick setup procedure. Refer to the LM5001 datasheet for
complete circuit design information.
Evaluation Board Schematic
300193
National Semiconductor
Application Note 1630
Steven Schulte
June 17, 2009
Refer to the LM5001 datasheet for complete circuit design
information.
The performance of the evaluation board is as follows:
Input Range: 16 to 42V
Output Voltage: 5V, ±2%
Output Current: 0 to 1A
Frequency of Operation: 250 kHz
Board Size: 2.75 X 1.75 X 0.6 inches
Load Regulation: 0.1%
Line Regulation: 0.1%
Over Current Limiting
www.national.com
30019301

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LM5001NISOEVAL Summary of contents

Page 1

... This application note contains the evaluation board schematic, Bill-of-Materials (BOM) and a quick setup procedure. Refer to the LM5001 datasheet for complete circuit design information. Evaluation Board Schematic © 2009 National Semiconductor Corporation National Semiconductor Application Note 1630 Steven Schulte June 17, 2009 Refer to the LM5001 datasheet for complete circuit design information ...

Page 2

Powering and Loading Considerations Read this entire page prior to attempting to power the evalu- ation board. QUICK SETUP PROCEDURE Step 1: Set the input source current limit to 1A. Turn off the input source. Connect the positive output of ...

Page 3

Flyback Topology FLYBACK TRANSFORMER Two things need to be considered when specifying a Flyback transformer to a magnetics manufacturer (Coilcraft, Pulse Engineering, Cooper-Coiltronics, etc.), the turns ratio to de- termine the duty cycle D (MOSFET on time compared to the ...

Page 4

Since these equations don’t take into account the various parasitic resistances and reactances present in all power converters, there will be some difference between the calcu- lated Bode plot and the gain and phase of the prototype circuit ...

Page 5

Performance Characteristics EFFICIENCY PLOTS Figure 1 shows the conversion efficiency versus output cur- rent for several input voltage conditions. FIGURE 1. TURN-ON WAVEFORM When applying power to the LM5001 evaluation board a soft- start sequence occurs. Figure 2 shows the ...

Page 6

... RESISTOR, 0805, VISHAY RESISTOR, 0805, VISHAY RESISTOR, 0805, VISHAY RESISTOR, 0805, VISHAY RESISTOR, 2010, VISHAY FA2636-AL POWER XFR, COILCRAFT LM5001MA REGULATOR, NATIONAL SEMICONDUCTOR 7693 TERMINAL, 6-32 SCREW, 4 PIN, KEYSTONE 5002 TERMINAL, SINGLE PIN, KEYSTONE 6 DESCRIPTION 2.2µ, 50V 0.1µ, 100V 0.01µ ...

Page 7

PCB Layout Silkscreen Component Side 7 30019306 30019307 www.national.com ...

Page 8

Solder Side 8 30019308 ...

Page 9

Notes 9 www.national.com ...

Page 10

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