Texas Instruments LM22672 1A SIMPLE SWITCHER Regulator LM22672EVAL/NOPB LM22672EVAL/NOPB 数据表
产品代码
LM22672EVAL/NOPB
User's Guide
SNVA369D – September 2008 – Revised April 2013
AN-1896 LM22672 Evaluation Board
1
Introduction
The LM22672 evaluation board is designed to demonstrate the capabilities of the LM22672 switching
regulator. The LM22672 evaluation board schematic shown in
regulator. The LM22672 evaluation board schematic shown in
is 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
DS(ON)
of
the integrated N-channel MOSFET and maximum 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 voltage of 5.5V or higher is required. The typical operating frequency is 500 kHz. The
evaluation board is designed to operate at ambient temperatures up to 50°C.
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 voltage of 5.5V or higher is required. The typical operating frequency is 500 kHz. The
evaluation board is designed to operate at ambient temperatures up to 50°C.
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 × 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. For more details, see LM22672/LM22672Q 42V, 1A SIMPLE
SWITCHER Step-Down Voltage Regulator with Features (
reach a regulated 3.3V output voltage. For more details, see LM22672/LM22672Q 42V, 1A SIMPLE
SWITCHER Step-Down Voltage Regulator with Features (
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.
regulator, the evaluation board can be re-configured for different output voltages.
Typical evaluation board performance and characteristics curves are shown in
. The PCB layout
is shown in
Test points are provided to enable easy connection and monitoring 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.
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
(
(
).
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1
SNVA369D – September 2008 – Revised April 2013
AN-1896 LM22672 Evaluation Board
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