Texas Instruments UCC29950EVM-631, User Manual, Page: 10 / 38

Test Setup
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5.1 Test Equipment
AC Source: (for example, Hewlett Packard 6813B 300 V
RMS
, 1750 VA AC Power Source/Analyzer) or
VARIAC. The input voltage shall be a transformer isolated variable AC source capable of supplying
between 90 V
AC
and 264 V
AC
, at 50 Hz and 60 Hz, at no less than 10-A peak.
13-V Bias Supply: The bias supply to the device shall be capable of supplying up to 13 V
DC
at no less
than 100 mA. Connect the bias supply to the negative and positive terminals of J5, shown in Figure 3 and
Figure 4 .
Output Load: One Electronic Load (for example TDI RBL 488 600-40-800). A programmable electronic
load set to constant current mode and capable of sinking 0 A to 25 A at 12 V
DC
shall be used. Connect the
load to J3 as shown in Figure 3 and Figure 4 .
Power Meter: For highest accuracy, a power analyzer shall be used to measure the input power, THD,
and power factor. An example of such an analyzer is the Voltech PM100 Single Phase Power Analyzer or
the Yokogawa WT210/WT230 Digital Power Meter.
Multimeters: For highest accuracy, the output voltage of the UCC29950EVM-631 shall be monitored by
connecting a digital voltmeter, V1, directly across TP18 and TP27 with the positive terminal at TP18 and
the negative terminal at TP27. A dc current meter, A1, should be placed in series with the electronic load
for accurate output current measurements.
Oscilloscope: A digital or analog oscilloscope with 500-MHz scope probes is recommended.
Fan: A fan, capable of 200 LFM to 400 LFM, should be used to maintain component temperatures within
safe operating ranges at all times during operation of the UCC29950EVM-631. Position the fan so as to
blow along the length of the heatsink as shown in
Figure 3 and Figure 4 .
Recommended Wire Gauge: All electrical connections to the EVM must be made using appropriately
rated wire. The line connections at J1, the PFC Output connections at J2 and the Aux Bias connections at
J5 may be made using 22 AWG (0.5 mm
2
) Tri Rated wire. The output connections at J3 may be made
with 16 AWG (1.5 mm
2
) Tri Rated wire. Use two conductors for the positive output and two for the
negative output. The normal output load current of 25 A causes a voltage drop of about 250 mV per meter
in both the positive and negative connections.
10 Using the UCC29950EVM-631 300-W PFC/LLC Off-Line PSU Module SLUUB69A – March 2015 – Revised March 2015
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