Texas Instruments UCC29950EVM-631, User Manual, Page: 8 / 38

Fan
62
k
: ,
5W
Electronic
Load
+ -
V1
- +
A1
-
+
V2
- + AC Source
L N
Power Meter
+
-
+
-
Voltage
Current
The 62-k : resistor and the
V2 Meter provide monitoring
and an automatic discharge
of the PFC stage output
capacitance (C6). They are
recommended but are not
necessary for operation and
may be omitted. Remember
to discharge C6 when
finished.
The voltage on the bulk
capacitor, C6, may be
monitored at J2 as shown
or at TP31 (pos) and TP
32 (neg)
Test Setup
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5 Test Setup
Figure 3 shows the test setup recommended in order to evaluate the UCC29950EVM-631 in Self Bias
Mode. Figure 4 shows the test setup recommended in order to evaluate the UCC29950EVM-631 in Aux
Bias Mode.
Figure 3. UCC29950EVM-631 Recommended Self Bias Test Set Up
8 Using the UCC29950EVM-631 300-W PFC/LLC Off-Line PSU Module SLUUB69A – March 2015 – Revised March 2015
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