LM22672EVAL/NOPB National Semiconductor, LM22672EVAL/NOPB Datasheet

BOARD EVALUATION FOR LM22672

LM22672EVAL/NOPB

Manufacturer Part Number
LM22672EVAL/NOPB
Description
BOARD EVALUATION FOR LM22672
Manufacturer
National Semiconductor
Series
SIMPLE SWITCHER®r
Datasheets
1.LM22672MRE-ADJNOPB.pdf (18 pages)
2.LM22672EVALNOPB.pdf (6 pages)

Specifications of LM22672EVAL/NOPB

Main Purpose
DC/DC, Step Down
Outputs And Type
1, Non-Isolated
Voltage - Output
3.3V
Current - Output
1A
Voltage - Input
4.5 ~ 42V
Regulator Topology
Buck
Frequency - Switching
500kHz
Board Type
Fully Populated
Utilized Ic / Part
LM22672
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Other names
*LM22672EVAL
LM22672EVAL
© 2010 National Semiconductor Corporation
LM22672 Evaluation Board
Introduction
The LM22672 evaluation board is designed to demonstrate
the capabilities of the LM22672 switching regulator. The
LM22672 evaluation board schematic shown in
configured to provide an output voltage of 3.3V up to 1A load
current with an input voltage range of 4.5V to 42V. Due to the
low R
mum duty-cycle limitations, the minimum input voltage of 4.5V
will only provide a 3.3V output voltage for load currents up to
500 mA. For load currents higher than 500 mA, an input volt-
age of 5.5V or higher is required. The typical operating fre-
quency is 500 kHz. The evaluation board is designed to
operate at ambient temperatures up to 50°C.
DS(ON)
of the integrated N-channel MOSFET and maxi-
300785
FIGURE 1. Evaluation Board Schematic
Figure 1
is
National Semiconductor
Application Note 1896
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 1A
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 LM22672 datasheet for more
details.
To aid in the design and evaluation of DC/DC buck converter
solutions based on the LM22672 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 LM22672
datasheet to determine if the circuit is in safe operating mode.
For more information about device function and electrical
characteristics, refer to the LM22672 datasheet.
Figure 2
through
30078501
Figure
www.national.com
5.
Figure 6

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LM22672EVAL/NOPB Summary of contents

Page 1

... For load currents higher than 500 mA, an input volt- age of 5.5V or higher is required. The typical operating fre- quency 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 1896 Frederik Dostal ...

Page 2

... This second output capacitor may be used to further reduce output voltage ripple. Value Supplier TDK Panasonic TDK Nippon Chemi-Con TDK Central Semiconductor Wurth Coilcraft 976Ω 1% 1.54 kΩ 1% National Semiconductor 2 ® designer online circuit simulation Part Number C3225X7R1H225K EEEFK1J220XP C1608X7R1H103K APXE6R3ARA121ME61G - C1608Y5V1A105Z CMSH1-60 744066220 MSS1038-223NLC ...

Page 3

Performance Characteristics Unless otherwise specified 12V FIGURE 2. Start-Up Waveforms (Load Resistor = 3.3Ω) FIGURE 3. Operation 25°C. A 30078505 30078502 FIGURE 5. Overall Loop Gain and Phase (I 3 30078503 FIGURE 4. ...

Page 4

PCB Layout Diagram www.national.com FIGURE 6. Top Layer 4 30078506 ...

Page 5

5 www.national.com ...

Page 6

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