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Connector and Test Point Descriptions

4 Connector and Test Point Descriptions

4.1 Enable Switches (SW1 and SW2)

TPS53128EVM-620 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 TPS53128’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)

TPS53128EVM-620 does not populate SW3. When using TPS53128EVM-620 to evaluate the TPS53126

controller in the TSSOP package, SW3 can be populated to allow selection of the TPS53126 switching

frequency between 350 kHz and 700 kHz.

4.3 Test Point Descriptions

Table 2 lists the test points, their labels, uses, and where additional information is located.

Table 2. TPS53128EVM-620 Test Points Description

Test Point Label Use Section

TP1 SS1 Monitor Channel 1 Soft-Start Voltage Section 4.3.4

TP2 SS2 Monitor Channel 2 Soft-Start Voltage Section 4.3.4

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 4.3.5

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 4.3.6

TP11 SW2 Monitor Switching Node for Channel 2 Section 4.3.5

4.3.1 Input Voltage Monitoring (TP3 and TP9)

TPS53128EVM-620 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)

TPS53128EVM-620 provides two test points for measuring the voltage generated at the VOUT1 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.

SLVU433–February 2011 TPS53128EVM-620

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