Datasheet
Connector and Test Point Descriptions
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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
Table 2 lists the test points, their labels, uses, and where additional information is located.
Table 2. 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 Section 4.3.1
TP4 GND Ground for Channel-1 Output Voltage Section 4.3.2
TP5 SW1 Monitor Switching Node for Channel 1 Section 4.3.4
TP6 GND Ground for Channel-2 Output Voltage Section 4.3.3
TP7 VOUT2 Monitor Output Voltage for Channel 2 Section 4.3.3
TP8 VOUT1 Monitor Output Voltage for Channel 1 Section 4.3.2
TP9 VIN Monitor Input Voltage Section 4.3.1
TP10 VREG5 Monitor Output of VREG5 Regulator Section 4.3.5
TP11 SW2 Monitor Switching Node for Channel 2 Section 4.3.4
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 Figure 2.
6
TPS53126EVM-600 SLVU435–February 2011
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