Texas Instruments UCC25600EVM, Руководство пользователя, Страница: 8 / 24

Test Procedure
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8 SLUU361A – April 2009 – Revised November 2018
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LLC Resonant Half-Bridge Converter, 300-W Evaluation Module
6 Test Procedure
Setup the EVM with equipment as shown in Figure 3 and following the test set up directions described in
Section 5 .
6.1 Line/Load Regulation and Efficiency Measurement Procedure
Set up the load to 1.0 A and input voltage between 375 V
DC
and 405 V
DC
. Prior to turning on the power,
set up the input source current limit to 1.0 A to avoid potential damage, although the EVM has its power
limit typical 350 W. Turn on the input source. Reference test results of line and load regulation can be
found from Section 7
6.2 Output Ripple
Along with the measurement of line and load regulation, the output voltage ripple can be measured at the
same time. The method of tip-and-barrel should be used for the output voltage ripple measurement. The
EVM provides such type of test point to facilitate the measurement for the type of oscilloscopes from
Tektronix as shown in
Figure 3 . Reference test results of the output voltage ripple can be found in
Section 7 .
6.3 Efficiency
The efficiency may be calculated based on the test data obtained from Section 6.1 . To correctly measure
input and output voltage for the efficiency calculation, test points TP1 and TP2 should be used for input
voltage measurement, and test points TP10 and TP18 should be used for output voltage measurement.
Reference results of efficiency can be found in
Section 7 .
6.4 Bode Plots
To measure loop compensation bode plots, a sweep signal may be injected through test points TP19 and
TP21. The full system bode plots is measured with TP19 and TP21. The controller bode plots is measured
with TP21 and U3 pin 4. The modulator bode plots is measured with U3 pin4 and TP19.
6.5 Others
The EVM provides plenty of test points to facilitate the device's evaluation work. Table 2 presents a list of
test points. Users can use these test points to make measurement to the functions of their interest. The
test points are divided into two groups, namely primary side group and secondary side group. During the
measurement setup, be aware of the setup especially for different ground pick up. The EVM is designed
with 3500-V reinforced insulation between the primary and the secondary. As such there is no common
ground as reference point for the measurement to be made on both sides. In other words, each side has
its own ground to be used for measurement reference point.