Texas Instruments UCC25600EVM, User Manual, Page: 6 / 24

Test Setup
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6 SLUU361A – April 2009 – Revised November 2018
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LLC Resonant Half-Bridge Converter, 300-W Evaluation Module
Table 2 shown below lists the functions of each test point.
Table 2. UCC25600EVM Test Points
PRIMARY TEST POINTS SECONDARY TEST POINTS
NAME REF DES CONNECTION NAME REF DES CONNECTION
Vin TP1
Module input
v
Vxm TP7 T2 pin 12
PGND TP3
Module input
voltage -
Vxm TP12 T2 pin 7
Vbias TP20 Primary Bias 12V + VOUT TP9 T2 pin 9 & 10
GND TP23 Primary Bias 12V - VO+ TP10
SS TP26 UCC25600 SS-pin VO- TP18 Output -
VDD TP22 UCC25600 VCC-pin Loop+ TP19 Loop m
GD1 TP24 UCC25600 pin 8 Loop- TP21 Loop measure -
GD2 TP25 UCC25600 pin 5 VOripple TP15 Output ripple
VG5 TP4 Q5 gate
OC TP17 UCC25600 pin 3
VG6 TP11 Q6 gate
SW1 TP6
Switch node of Q5
and Q6
PGND TP16 Power GND
Icr TP2
Resonant tank
current
Vxm TP5 T2 pin 6
Vcr TP13
Resonant capacitor
voltage
OUTB TP14 T3 pin 1
OUTA TP8 T3 pin 4
5.2 Test Equipment
Voltage Source: The input source shall be a constant DC source capable of supplying 390 V
DC
with
minimum 1.0 A
DC
current rating.
Multimeters: Multimeters are used to measure the output voltage (DMM1), the input voltage (DMM3), the
output current (DMM2) and the input load current (DMM4).
Output Load: A programmable electronic load is recommended, configurable for constant current mode
and capable of sinking 0 A
DC
to 25 A
DC
from 12 V
DC
. The output voltage can be monitored by connecting a
DC voltmeter, DMM1 to sense pins (TP10 and TP18) shown in Figure 3 . A DC current meter, DMM2, may
be inserted in series with the electronic load for accurate output current measurements. Similarly, the input
voltage can be monitored by connecting a DC voltage meter to sense pins (TP1 and TP3). The input
current can be monitored by a DC current meter too. These are shown in
Figure 3 .
Oscilloscope: Set the oscilloscope channel to AC coupling with 20-MHz bandwidth.