Chapter 2
SLVU802 – October 2012
Connector and Test Point Descriptions
2.1
Input / Output Connectors: TPS8269xEVM
2.1.1 J1 V
IN
This header is the positive connection to the input power supply. The power supply must be connected
between J1 and J3 (GND). The leads to the input supply should be twisted and kept as short as possible.
The input voltage must be between 2.3 V and 4.8 V.
2.1.2 J2 S+ / S–
J2 S+ / S– are the sense connection for the input of the converter. Connect a voltmeter, sense connection
of a power supply, or oscilloscope to this header.
2.1.3 J3 GND
This header is the return connection to the input power supply. Connect the power supply between J3 and
J1 (V
IN
). The leads to the input supply should be twisted and kept as short as possible. The input voltage
must be between 2.3 V and 4.8 V.
Capacitor C1 compensates for parasitic inductance as a result of the wires from the DC power supply to
the EVM. It is not required in an actual application circuit.
2.1.4 J4 V
OUT
This header is the positive output of the step-down converter. The TPS8269x has fixed output voltages;
refer to the specific device data sheet for detailed information on the device output voltage.
2.1.5 J5 S+ / S–
J5 S+ / S– are the sense connection for the output of the converter. Connect a voltmeter, sense
connection of an electronic load, or oscilloscope to this header.
2.1.6 J6 GND
J6 is the return connection of the converter. A load can be connected between J6 and J4 (V
OUT
).
2.2
Jumpers and Switches
2.2.1 JP1 ENABLE
This jumper can enable or disable the converter on the EVM. Placing a shorting bar between ENABLE
and ON turns on the converter. Placing a shorting bar between ENABLE and OFF disables the converter.
2.2.2 JP2 MODE
This jumper can enable or disable the power-saving mode (PSM) under light loads. Placing a shorting bar
between MODE and pulse width modulation (PWM) disables the PSM. If the PSM is disabled, the
converter operates in forced PWM mode over the entire load current range.
Placing a shorting bar between MODE and PSM enables the power-saving mode. The device operates in
power-saving mode under light load conditions. See the specific device data sheet for detailed information.
6
Connector and Test Point Descriptions
SLVU802 – October 2012
Copyright © 2012, Texas Instruments Incorporated
