5 test setup and power-up/power-down instructions, Warning – Texas Instruments UCC28060EVM User Manual
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5
Test Setup and Power-Up/Power-Down Instructions
Isolation Transformer
0 to 300W Load
VM
+
13V Bias Supply
Test Setup and Power-Up/Power-Down Instructions
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WARNING
There are high voltages present on the pre-regulator. It should only
be handled by experienced power supply professionals. To
evaluate this board as safely as possible, the following test
configuration should be used:
•
Connect an isolation transformer between the source and unit
•
Attach a voltmeter and a resistive or electronic load to the unit
output before supplying power to the EVM.
A separate 13-V bias supply is required to power the UCC28060 control circuitry. The unit will start up
under no-load conditions. However, for safety, a load should be connected to the output of the device
before it is powered up. The unit should also never be handled while power is applied to it or when the
output voltage is above 50-V dc. Refer to
for a recommended test setup diagram.
CAUTION
There are very high voltages on the board. Components can and will reach
temperatures greater than 100
°
C. Use caution when handling the EVM.
Figure 3. Test Setup
UCC28060EVM 300-W Interleaved PFC Pre-Regulator
4
SLUU280B – May 2007 – Revised July 2008