List of Terminals
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12
SLUUBQ8B – August 2017 – Revised January 2017
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Copyright © 2017, Texas Instruments Incorporated
Using the UCC25630-1EVM-291
Table 3. Test Points (continued)
TEST POINTS
NAME
DESCRIPTION
TP17
INJECT1
Small signal injection terminal
TP18
INJECT2
Small signal injection terminal
TP19
BW
Bias winding voltage sense
TP20
RVCC
Regulated 12-V supply
TP21
VCC
Supply input
TP22
LL/SS
Soft-start and light-load burst mode threshold
TP23
VOUT_N
Output voltage return terminal
7
List of Terminals
Table 4. Terminals
TERMINAL
NAME
DESCRIPTION
J1
AC Input
3-pin, AC power input, 85 V to 265 V
J2
VIN_P
Input voltage positive terminal
J3
VIN_N
Input voltage return terminal
J4
DISABLE
External disable terminal
J5
VOUT
Output voltage terminal, 4-pin
8
Test Procedure
1. Refer to
Figure 3
for basic setup. The required equipment for this measurement is listed in
Section 5.1
.
2. Before making electrical connections, visually check the board to make sure there are no suspected
spots of damage.
3. Keep the DC voltage source output off, connect it to J2 (+) and J3 (-). The DC voltage source should
be isolated and meet the IEC60950 requirement. Set the DC output voltage within the range specified
in
Table 1
, between 340 VDC and 410 VDC; set the DC source current limit to 1 A.
NOTE:
The board has no fuse installed and relies on the external voltage source current limit to
ensure circuit protection.
4. Connect an electronic load set to either constant current mode or constant resistance mode. The load
current range is from 0 A to 10 A.
5. Keep the AC voltage source output off, connect it to J1 with AC_line to J1-1, AC_earth to J1-2,
AC_neutral to J1-3. The AC voltage source should be isolated and meet the IEC60950 requirement.
Set the AC output voltage in the range specified in
Table 1
, between 85 VAC and 264 VAC; set the AC
source current limit to 200 mA.
6. If the load does not have a current or a power display, a current meter needs to be inserted between
the load and the board.
7. Connect a voltage meter across the load and set the meter’s scale to 20 VDC.
8. Turn on the AC voltage source output.
9. Turn on the DC voltage source output. Then the measurements can be made.
8.1
Equipment Shutdown
1. Shut down AC voltage source.
2. Shut down DC voltage source.
3. Shut down electronic load.