Texas Instruments LM25085AMYEEVAL 42V Constant On-Time PFET Buck Switching Controller with 0.9V Reference LM25085AMYEEVA LM25085AMYEEVAL/NOPB Scheda Tecnica
Codici prodotto
LM25085AMYEEVAL/NOPB
User's Guide
SNVA384B – February 2009 – Revised April 2013
AN-1933 LM25085A Evaluation Board
1
Introduction
The LM25085AEVAL evaluation board provides the design engineer with a fully functional buck regulator,
employing the LM25085A PFET switching controller which uses the constant on-time (COT) operating
principle. This evaluation board provides a 1V output over an input range of 4.5V to 24V. The circuit
delivers load currents to 5A, with current limit set at
employing the LM25085A PFET switching controller which uses the constant on-time (COT) operating
principle. This evaluation board provides a 1V output over an input range of 4.5V to 24V. The circuit
delivers load currents to 5A, with current limit set at
≊
8.2A. The board is populated with all components
except C5 and C7.
The board’s specification are:
•
Input Voltage: 4.5V to 24V
•
Output Voltage: 1V
•
Maximum load current: 5A
•
Minimum load current: 0A
•
Current Limit Threshold:
≊
8.2A
•
Measured Efficiency: 77.5% (V
IN
= 4.5V, I
OUT
= 1Amp, typical efficiency for converter providing a 1V
output)
•
Nominal Switching Frequency: 200 kHz
•
Size: 3.1 in. x 1.5 in.
Figure 1. Evaluation Board - Top Side
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SNVA384B – February 2009 – Revised April 2013
AN-1933 LM25085A Evaluation Board
Copyright © 2009–2013, Texas Instruments Incorporated