Texas Instruments Evaluation Module for TPS53128 Dual Synchronous Step-Down Controller TPS53128EVM-620 TPS53128EVM-620 Datenbogen
Produktcode
TPS53128EVM-620
www.ti.com
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.
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.
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
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
TP2
SS2
Monitor Channel 2 Soft-Start Voltage
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)
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.
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.
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
and barrel measurement technique shown in
5
SLVU433 – February 2011
TPS53128EVM-620
© 2011, Texas Instruments Incorporated