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User's Guide
SNVA196B–January 2007–Revised April 2013
AN-1549 LM34914 Evaluation Board
1 Introduction
The LM34914EVAL 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 40V. The circuit delivers load currents to 1A, with current limit set at ≊1.2A.
The board is populated with all components except R3, C2, C11 and C12. These components provide
options for managing the output ripple as described later in this user's guide.
The board’s specification are:
• Input Voltage: 8V to 40V
• Output Voltage: 5V
• Maximum load current: 1.0A
• Minimum load current: 0A
• Current Limit: ≊1.2A (Vin = 8V)
• Measured Efficiency: 94.5% (V
IN
= 8V, I
OUT
= 200 mA)
• Nominal Switching Frequency: 275 kHz
• Size: 2.0 in. × 1.0 in. × 0.53 in
2 Example Circuit
Figure 1. Evaluation Board - Top Side
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1
SNVA196B–January 2007–Revised April 2013 AN-1549 LM34914 Evaluation Board
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Verzeichnis
- ・ Blockdiagramm on Seite 2
- ・ Anwendungsbereich on Seite 9
