Texas Instruments UCC28610EVM-474, User Manual

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Test Procedure
6 Test Procedure
All tests should use the set up as described in Section 5 of this user ’ s guide. The following test procedure
is recommended primarily for power up and shutting down the evaluation module. Never leave a powered
EVM unattended for any length of time.
6.1 Applying Power to the EVM
1. Set up the EVM as shown in Section 5 of this user ’ s guide
(a) If no-load input power measurements are to be made, set the power analyzer to long averaging
and external shunt mode. Insert a shunt, such as a 10- Ω resistor as shown in Figure 3 , in series
with the Neutral terminal of the EVM. Set the appropriate current scale on the power analyzer.
(b) For operation with a load, as shown in Figure 4 , set the electronic load to constant current mode to
sink 0 A.
2. Prior to turning on the AC source, set the voltage to between 85 V
AC
and 265 V
AC
.
3. Turn on the AC source.
4. Monitor the output voltage on DMM V
1
.
5. Monitor the output current on DMM A
1
.
6. The EVM is now ready for testing.
6.2 No-Load Power Consumption
1. Use the test set up shown in Figure 3 .
(a) Set the power analyzer to external shunt mode.
(b) Set the appropriate current scale factor for using an external shunt on the power analyzer. A 10-
Ω
shunt scales at 10,000 mV/A for the PM100 Voltech.
(c) Set the power analyzer long averaging time to include several cycles of operation. The PM100
Voltech should be set to a long averaging time of 10 or more for accurate burst mode
measurements.
2. Apply power to the EVM per Section 6.1 .
3. Monitor the input power on the power analyzer while varying the input voltage.
4. Make sure the input power is off and the bulk capacitor and output capacitors are completely
discharged before handling the EVM.
11 SLUU383B – November 2009 – Revised May 2011 UCC28610EVM-474 25-W Universal Off-Line Flyback Converter
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