Texas Instruments LM27342 (10-Pin LLP) - 2MHz 2A Wide Input Buck Regulator with Frequency Synchronization EVM LM27342SDE LM27342SDEVAL Scheda Tecnica
Codici prodotto
LM27342SDEVAL
User's Guide
SNVA381A – November 2008 – Revised April 2013
AN-1929 LM27342 Demonstration Board
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Introduction
The LM27342 demonstration board is designed to provide the power supply design engineer with a fully
functional regulator design, which can be synchronized to an external clock between 1000 kHz and 2350
kHz. The evaluation board provides a 3.3V output with a 2A current capability. The wide input voltage
ranges from 5V to 20V. Without an external synchronization signal, the design operates at 2000 kHz
reducing the solution size and keeping switching noise out of the AM radio band. The printed circuit board
(PCB) consists of four layers of copper on FR4 material. There is a ground plane on the internal layer
directly beneath the LM27342, and a ground plane on the bottom layer. The LM27342 is thermally tied to
the ground planes by thermal vias directly underneath the device. The second internal layer is tied half to
V
functional regulator design, which can be synchronized to an external clock between 1000 kHz and 2350
kHz. The evaluation board provides a 3.3V output with a 2A current capability. The wide input voltage
ranges from 5V to 20V. Without an external synchronization signal, the design operates at 2000 kHz
reducing the solution size and keeping switching noise out of the AM radio band. The printed circuit board
(PCB) consists of four layers of copper on FR4 material. There is a ground plane on the internal layer
directly beneath the LM27342, and a ground plane on the bottom layer. The LM27342 is thermally tied to
the ground planes by thermal vias directly underneath the device. The second internal layer is tied half to
V
IN
and half to V
OUT
. This application report contains the evaluation board schematic, a quick setup
procedure, and a Bill-of-Materials (BOM). For complete circuit design information, see the
LM27341/LM27342/LM27341Q/LM27342Q 2 MHz 1.5A/2A Wide Input Range Step-Down DCDC
Regulator with Frequency Synchronization (
LM27341/LM27342/LM27341Q/LM27342Q 2 MHz 1.5A/2A Wide Input Range Step-Down DCDC
Regulator with Frequency Synchronization (
) data sheet.
The performance of the evaluation board is as follows:
Input Range: 5 to 20V
Output Voltage: 3.3V
Output Current: 0 to 2A
Frequency of Operation: 1000 kHz - 2350 kHz
Board Size: 1.1 X 1.3 inches
2
Evaluation Board Schematic
3
Powering and Loading Considerations
Read this entire page prior to attempting to power the evaluation board.
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SNVA381A – November 2008 – Revised April 2013
AN-1929 LM27342 Demonstration Board
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