User's Guide
SNVA291A – October 2007 – Revised April 2013
AN-1724 LM5015 Isolated Two-Switch DC-DC Regulator
Evaluation Board
1
Introduction
The LM5015 Isolated DC-DC regulator evaluation board provides a low cost and fully functional DC-DC
regulator without employing any discrete power MOSFET. The evaluation board can be configured as
either an Isolated Two-Switch Forward DC-DC Regulator, or an Isolated Two-Switch Flyback DC-DC
Regulator. The factory default configuration of the evaluation board is forward topology. The forward
converter configuration will produce about 2% higher efficiency and lower output ripple voltage than the
flyback. Whereas, the Flyback configuration costs slightly less. Suggestion to reconfigure the evaluation
board as an Isolated Two-Switch Flyback DC-DC Regulator is provided at the end of this document.
For detailed features and technical information of the LM5015 device, see the LM5015 High Voltage
Monolithic Two-Switch Forward DC-DC Regulator Data Sheet (SNVS538). For non-isolated applications,
see the AN-1725 LM5015 Non-Isolated Two-Switch DCDC Regulator Evaluation Board User's Guide
(SNVA292).
The evaluation board features:
• Input Voltage: 36V to 72V
• Isolated Output Voltage: 5V
• Output Current: 0A minimum, 2.5A nominal, and 3A maximum
• Input UVLO Threshold: 34V nominal
• Measured Efficiency: 86% (VIN = 48V, IOUT = 2.5A)
• Switching Frequency: 300 kHz
• Ability to Synchronize to External Clock
• Ability to Be Remote Controlled (Enable/Disable)
• Two Layer PC Board and Top Side Component Placement
• Configurable as Either a Forward (Factory Default) or a Flyback Regulator
• Board Size (WxLxH): 2.5 in. x 3.5 in. x 0.63 in
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SNVA291A – October 2007 – Revised April 2013
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AN-1724 LM5015 Isolated Two-Switch DC-DC Regulator Evaluation Board
Copyright © 2007–2013, Texas Instruments Incorporated
1
Board Connections/Start-up
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Figure 1. Evaluation Board Layout
2
Board Connections/Start-up
Figure 1 shows the PC board layout. The input connections are made to connectors J1 (high potential)
and J2 (input return). The load is connected between connectors J3 (5V) and J4 (5V return). Ensure the
wires are adequately sized for the intended load current.
A DC power supply capable of at least 75V and 0.5A is recommended as the input power source for the
evaluation board. Use the output over-voltage and over-current limit features of the DC power supply to
protect the board against damage by errant connections.
A resistive load is optimal, but an appropriate electronic load is acceptable. The maximum load current is
3A. Exceeding this current will cause the LM5015 to enter cycle-by-cycle peak current limit mode, and the
output voltage will fall below the regulated 5V. Current limit mode is triggered whenever the primary switch
current exceeds 1.2A (nominal).
During the first power up, the load should be kept reasonably low (
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