Texas Instruments AN-1955 LM5009A User Manual

1 Introduction
The LM5009AEVAL evaluation board provides the design engineer with a fully functional buck regulator,
employing the constant on-time (COT) operating principle. This evaluation board provides a 5V output
over an input range of 8V to 75V. The circuit delivers load currents to 150 mA, with current limit set at a
nominal 260 mA.
The board's specification are:
• Input Voltage: 8V to 75V
• Output Voltage: 5V
• Maximum load current: 150 mA
• Minimum load current: 0A
• Current Limit: 260 mA (nominal)
• Measured Efficiency: 90.6% (V
• Nominal Switching Frequency: 130 kHz
• Size: 2.6 in. x 1.6 in.
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SNVA392A – June 2009 – Revised April 2013
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AN-1955 LM5009A Evaluation Board
= 8V, I = 100 mA)
IN OUT
Figure 1. Evaluation Board - Top Side
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User's Guide
SNVA392A – June 2009 – Revised April 2013
AN-1955 LM5009A Evaluation Board
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