Datasheet

0-55V, 16A

DC Power

Supply

Scope

J1 VIN+

VIN-J2

J4VOUT-

VOUT+

LM5117 BUCK

Current-meter

+ Electronic Load

With Current Meter

- 0A-9A

Volt-meter Volt-meter

Powering and Loading Consideration

www.ti.com

3.3 Loading

When using an electronic load, it is strongly recommended to power up the evaluation board at light load

and then slowly increase the load. If it is desired to power up the evaluation board at maximum load,

resistor bank must be used. In general, electronic load is best suited for monitoring steady state

waveforms.

3.4 Air Flow

Prolonged operation with high input voltage at full power will cause the MOSFETs to overheat. A fan with

a minimum of 200LFM should be always provided.

3.4.1 Quick Start-Up Procedure

1. Set the power supply current limit to at least 16A. Connect the power supply to J1 and J2.

2. Connect the load with a 9A capacity between J3 and J4.

3. Set input voltage to 15V and turn it on.

4. Measure the output voltage. The output should be regulated at 12V.

5. Slowly increase the load current while monitoring the output voltage. The output should remain in

regulation up to full load current.

6. Slowly sweep the input voltage from 15V to 55V while monitoring the output voltage. The output should

remain in regulation.

Figure 1. Typical Evaluation Setup

AN-2103 LM25117 Evaluation Board SNVA466B–May 2011–Revised April 2013

Submit Documentation Feedback