Datasheet

2 Setup
3 Operation
Setup www.ti.com
Table 1 describes the jumpers and connectors on the EVM, as well as how to properly connect, set up,
and use the TPS78101EVM-339.
Table 1. TPS78101EVM-339 Jumpers and Connections
Connection
Jumper Connection Instructions
Description
J1 U1 Input - VIN Connect the positive lead of the input source to this input.
J2 U1 Input - GND Connect the return lead of the input source to this input.
J3 U1 Output - VOUT Connect the positive side of the load to this output.
J4 U1 Output - GND Connect the ground side of the load to this output.
J5 U2 Input - VIN Connect the positive lead of the input source to this input.
J6 U2 Input - GND Connect the return lead of the input source to this input.
J7 U2 Output - VOUT Connect the positive side of the load to this output.
J8 U2 Output - GND Connect the ground side of the load to this output.
Enable input for the U1 device. Place a shunt across the H and EN pins of JP1 to enable U1.
JP1 U1 EN Place a shunt across the L and EN pins of JP1 to disable U1. A shunt must be installed on
JP1 in either H or L positions and EN must not be left unconnected.
This jumper is not used with this EVM in its default configuration. If the user modifies the EVM
JP2 U1 V
SET
/FB and replaces U1 with a fixed output voltage option, JP2 is used to change the output voltage
between the two fixed output voltages.
Enable input for the U2 device. Place a shunt across the H and EN pins of JP3 to enable U2.
JP3 U2 EN Place a shunt across the L and EN pins of JP3 to disable U2. A shunt must be installed on
JP1 in either H or L positions and EN should not be left unconnected.
This jumper is used to program the output voltage. Place a shunt across the H and V
SET
pins
JP4 U2 V
SET
/FB of JP4 to set the output of U2 to the default value of 2.2 V. Place a shunt across the L and
V
SET
pins of JP4 to the output of U2 to the default value of 3.3 V.
To setup the EVM Board operation
1. Connect the positive input power supply to the VIN pins on J1/J5.
2. Connect the input power return (ground) to the GND pins on J2/J6. The TPS78101EVM-339 has a
maximum input voltage of 6 V. The recommended maximum operating input voltage is 5.5 V.
3. Connect the desired load between the VOUT (J3/J7) and GND (J4/J8). Each TPS781xxx supplies up
to 150 mA of output current.
4. Configure jumpers JP1/JP3 and JP2/JP4 according to Table 1 and as required for your application.
Additional versions of the TPS781xxx can be tested on this EVM by replacing U1 or U2 with the IC to
be tested and appropriately configuring the resistors and jumpers on the PCB.
TPS78101EVM-339 2 SLVU242 – April 2008
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