LM22671EVAL/NOPB National Semiconductor, LM22671EVAL/NOPB Datasheet

BOARD EVALUATION FOR LM22671

LM22671EVAL/NOPB

Manufacturer Part Number
LM22671EVAL/NOPB
Description
BOARD EVALUATION FOR LM22671
Manufacturer
National Semiconductor
Series
SIMPLE SWITCHER®r
Datasheets
1.LM22671MRE-ADJNOPB.pdf (18 pages)
2.LM22671EVALNOPB.pdf (6 pages)
3.LM22671EVALNOPB.pdf (18 pages)

Specifications of LM22671EVAL/NOPB

Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
3.3V
Current - Output
500mA
Voltage - Input
4.5 ~ 42 V
Regulator Topology
Buck
Frequency - Switching
500kHz
Board Type
Fully Populated
Utilized Ic / Part
LM22671
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Lead Free Status / Rohs Status
Compliant
Other names
*LM22671EVAL
*LM22671EVAL/NOPB
LM22671EVAL
LM22671EVAL
© 2010 National Semiconductor Corporation
LM22671 Evaluation Board
Introduction
The LM22671 evaluation board is designed to demonstrate
the capabilities of the LM22671 switching regulator. The
LM22671 evaluation board schematic shown in
configured to provide an output voltage of 3.3V up to 500 mA
load current with an input voltage range of 4.5V to 42V. The
typical operating frequency is 500 kHz. The evaluation board
is designed to operate at ambient temperatures up to 50°C.
300784
FIGURE 1. Evaluation Board Schematic
Figure 1
is
National Semiconductor
Application Note 1895
Frederik Dostal
July 6, 2010
The performance of the evaluation board is as follows:
Input Range: 4.5V to 42V
Output Voltage: 3.3V
Output Current Range: 0A to 500 mA
Frequency of Operation: 500 kHz
Board Size: 1.5 X 1.5 inches
Package: PSOP-8
At low input voltages between 4.5V and 6V, a minimum load
of approximately 5 mA may be required to reach a regulated
3.3V output voltage. See the LM22671 datasheet for more
details.
To aid in the design and evaluation of DC/DC buck converter
solutions based on the LM22671 switching regulator, the
evaluation board can be re-configured for different output
voltages.
Typical evaluation board performance and characteristics
curves are shown in
shows the PCB layout.
Test points are provided to enable easy connection and mon-
itoring of critical signals. When performing over load or short
circuit tests, refer to the current limit section of the LM22671
datasheet to determine if the circuit is in safe operating mode.
For more information about device function and electrical
characteristics, refer to the LM22671 datasheet.
Figure 2
through
30078401
Figure
www.national.com
5.
Figure 6

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LM22671EVAL/NOPB Summary of contents

Page 1

... The typical operating frequency is 500 kHz. The evaluation board is designed to operate at ambient temperatures up to 50°C. © 2010 National Semiconductor Corporation National Semiconductor Application Note 1895 Frederik Dostal ...

Page 2

... Output capacitor C5 is not populated but space is provided to add a second output capacitor. This second output capacitor may be used to further reduce output voltage ripple. Supplier TDK C3225X7R1H225K Panasonic TDK C1608X7R1H103K TDK C2012X5R0J226M - TDK C1608Y5V1A105Z Central Semiconductor Wurth Coilcraft MSS7341-393MLD - CRCW0603976RFKEA - CRCW06031K54FKEA - National Semiconductor LM22671MR-ADJ 2 Part Number EEEFK1J220XP CMSH1-60 7447779139 ...

Page 3

Performance Characteristics Unless otherwise specified 12V FIGURE 2. Start-Up Waveforms (Load Resistor = 6.6Ω) FIGURE 3. Operation at 500 mA = 25°C. A 30078405 30078402 FIGURE 5. Overall Loop Gain and Phase (I 3 30078403 FIGURE ...

Page 4

PCB Layout Diagram www.national.com FIGURE 6. Top Layer 4 30078406 ...

Page 5

5 www.national.com ...

Page 6

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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