Volt-meter
Current-meter
VIN
RTN(GND)
OUT1+(3.3V)
OUT1-(GND)
OUT2-(GND)
OUT2+(1.8V)
+ Electric Load
With Current Meter
- 0A-8A
- Electric Load
With Current Meter
+ 0A-8A
0-36V, 20A
DC Power
Supply
Volt-meter
Volt-meter
Scope
J1
J2
J6
J5
J4
J3
LM25119 DUAL BUCK
Powering and Loading Consideration
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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 banks must be used. In general, electronic loads are 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.
Figure 1. Typical Evaluation Setup
3.5
Quick Start-Up Procedure
1. Set the power supply current limit to at least 20A. Connect the power supply to J1 and J2.
2. Connect one load with an 8A capacity between J3 and J4. Connect another load with an 8A capacity
between J6 and J5.
3. Set input voltage to 12V and turn it on.
4. Measure the output voltages. CH1 should regulate at 3.3V and CH2 should regulate at 1.8V.
5. Slowly increase the load current while monitoring the output voltages. The outputs should remain in
regulation up to full load current.
6. Slowly sweep the input voltage from 6.0V to 36V while monitoring the output voltages. The outputs
should remain in regulation.
2
AN-2066 LM25119 Evaluation Board
SNVA445B – August 2010 – Revised April 2013
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