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General Configurations
7
SLVUA44B – June 2014 – Revised July 2017
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Copyright © 2014–2017, Texas Instruments Incorporated
TPS25940EVM-635: Evaluation Module for TPS25940X
4.4
Test Procedures
Use the following steps for the test procedure:
1. The operational voltage range of the two rails VIN1 and VIN2 can be adjusted by changing a few
resistor settings, as listed in
Table 6
.
Table 6. Operational Range Setting for VIN1, VIN2 = 12 V, 5 V and 3.3 V
VIN Operational Range
Rail: VIN1 or VIN2
R9
R13
R11
R22
R26
12 V: 10.5 V to 16 V
(Default)
VIN1
16.9k
32.4k
47k
5 V: 4.6 V to 5.7 V
VIN1
23.2k
105k
137k
3.3 V: 3 V to 3.8 V
VIN1
48.7k
187k
237k
2.3 V to 15.5 V (Default)
VIN2
NoPoP
32.4k
5 V: 4.6 V to 5.7 V
VIN2
130k
100k
3.3 V: 3 V to 3.8 V
VIN2
237k
169k
2. Turn on the power supply and set the power supply voltage to 12 V.
3. Turn off the power supply. Hook up CH1 and CH2 of the PWR635 assembly as shown in
Figure 2
.
4. Ensure that the output load is disabled and the power supply is set properly for the design under test
(DUT). Connect the negative probe of DMM to TP12 or TP25 (GND).
5. Turn on the power supply,
only 1 channel at a time
. Verify that the voltages shown in
Table 7
are
obtained.
Table 7. PWR635 DMM Readings at Different Test Points
Voltage test on (CH1)
Measured Voltage Reading
Voltage tested on (CH2)
Measured Voltage Reading
VIN1 (TP3)
12 ±0.3 VDC
VIN2 (TP15)
12 ±0.3 VDC
EN_UV1 (TP8)
1.13 ±0.1 VDC
EN_UV2 (TP17)
12 ±1 VDC
OVP1 (TP5)
0.742 ±0.1 VDC
OVP2 (TP18)
0.742 ±0.1 VDC
IMON1 (TP11)
32.9 mV ±5 mV VDC
IMON2 (TP22)
32.6 mV ±5 mV VDC
VOUT1 (TP2)
12 ±0.3 VDC
VOUT2 (TP16)
12 ±0.3 VDC
PG1 (TP9)
2.40 ±0.2 VDC
PG2 (TP21)
2.4 ±0.2 VDC
FLTb1 (TP4)
10.51 ±0.5 VDC
FLTb2 (TP20)
10.5 ±0.5 VDC
