4 Connector and Test Point Descriptions
4.1 Enable Switches – SW1 and SW2
TPS53126EVM-600 includes independent enable switches for each of the two outputs. When the switch is in the
DIS position, the channel is disabled and discharged per the TPS53126’s internal discharge characteristics.
To enable V
OUT1
, place SW1 in the EN position. To enable V
OUT2
, place SW2 in the EN position.
4.2 Switching Frequency Select Switch – SW3
TPS53126EVM-600 includes a frequency select switch (SW3) to select the frequency programmed by the
TEST2 IC pin of the TPS53126. When in the 350-kHz position, the D-CAP2™ mode control selects the Ton
for 350-kHz operation. When in the 700-kHz position, the D-CAP2™ mode control selects the Ton for 700-kHz
operation. For more details of switching frequency verse V
IN
and I
OUT
, see the TPS53126 data sheet .
Do not switch the position of SW3 while the TPS53126EVM-600 module is running. To change frequency
selection, disable both Channel 1 and Channel 2 before changing the switching frequency.
4.3 Test Point Descriptions
lists the test points, their labels, uses, and where additional information is located.
Table 4-1. TPS53126EVM-600 Test Points Description
Test Point
Label
Use
Section
TP1
TEST1
Not Used
TP2
TEST2
Monitor Frequency Select Voltage (5 V or GND)
TP3
GND
Ground for Input Voltage
TP4
GND
Ground for Channel-1 Output Voltage
TP5
SW1
Monitor Switching Node for Channel 1
TP6
GND
Ground for Channel-2 Output Voltage
TP7
VOUT2
Monitor Output Voltage for Channel 2
TP8
VOUT1
Monitor Output Voltage for Channel 1
TP9
VIN
Monitor Input Voltage
TP10
VREG5
Monitor Output of VREG5 Regulator
TP11
SW2
Monitor Switching Node for Channel 2
4.3.1 Input Voltage Monitoring –TP3 and TP9
TPS53126EVM-600 provides two test points for measuring the voltage applied to the module. This allows the
user to measure the actual module voltage without losses from input cables and connectors. Measure all input
voltage between TP9 and TP3. To use TP9 and TP3, connect a voltmeter positive terminal to TP9 and negative
terminal to TP3.
4.3.2 Channel-1 Output Voltage Monitoring – TP4 and TP8
TPS53126EVM-600 provides two test points for measuring the voltage generated at the V
OUT1
output by the
module. This allows the user to measure the actual output voltage without losses from output cables and
connectors. Measure all dc output voltage measurements between TP8 and TP4. To use TP8 and TP4, connect
a voltmeter positive terminal to TP8 and negative terminal to TP4.
For output ripple measurements, TP8 and TP4 allow a user to limit the ground loop area by using the tip and
barrel measurement technique shown in
.
Connector and Test Point Descriptions
6
TPS53126 Buck Controller Evaluation Module User's Guide
SLVU435A – FEBRUARY 2011 – REVISED JANUARY 2022
Copyright © 2022 Texas Instruments Incorporated
