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User's Guide
SNVA184B–September 2006–Revised May 2013
AN-1522 LM5069 Evaluation Board
1 Introduction
The LM5069EVAL evaluation board provides the design engineer with a fully functional hot swap
controller board designed for positive voltage systems. This board contains an LM5069-2, the auto restart
version of this IC. This application note describes the various functions of the board, how to test and
evaluate it, and how to change the components for a specific application. For more information, view the
LM5069 Positive High Voltage Hot Swap / Inrush Current Controller with Power Limiting (SNVS452) data
sheet.
The board’s specifications are:
• Input voltage range: +78V maximum, limited by the transient suppressor (Z1)
• Current limit: 5.5 Amps, ±11.8%
• Q1 Power limit: 45W
• UVLO Thresholds: 34.4V, ±4.4% and 32.4V, ±2%
• OVLO Thresholds: 77.7V, ±2% and 75.7V, ±3.6%
• Insertion delay: 600 ms
• Fault timeout period: 38 ms
• Restart time: 7.7 seconds
• Size: 4.0” x 1.4”
2 Board Configuration
Figure 1. Evaluation Board - Top Side
The LM5069 evaluation board is shown in Figure 1, and the schematic is shown in Figure 2. The
“BACKPLANE” section, at the left end of the board, represents the backplane voltage source. The vertical
dashed line is the boundary between the backplane voltage source and the hot swap circuit input. In other
words, it represents the edge connector in a card cage system. The toggle switch (SW1) provides a
means to “connect” and “disconnect” the hot swap circuit from the backplane voltage source. The circuitry
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SNVA184B–September 2006–Revised May 2013 AN-1522 LM5069 Evaluation Board
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