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J1
C1 C2
C4
C3
C5
C6
R1
R2
R3
R4
D1
L1
J3
GND OUT1 OUT2
IN
GND
NATIONAL
SEMICONDUCTOR
LM5010 EVALUATION BD
55101 2308-001 REV B
C2002
U1
R5
C7
User's Guide
SNVA101A–December 2004–Revised April 2013
AN-1352 LM5010 Evaluation Board
1 Introduction
The LM5010EVAL 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 10V output
from an input range of 12V - 75V. The circuit provides load currents > 1A, with the current limit set at
≊1.3A.
The board’s specification are:
• Input Voltage: 12V to 75V
• Output Voltage: 10V, ±3%
• Maximum Continuous Output current: 1.0A
• Current Limit: 1.3A
• Measured Efficiency: 93% (V
IN
= 12V, I
OUT
= 500 mA)
• Switching Frequency: ≊480 kHz
• Size: 1.1 in. x 1.875 in. x 0.47 in
Figure 1. Evaluation Board - Top Side
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1
SNVA101A–December 2004–Revised April 2013 AN-1352 LM5010 Evaluation Board
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