Datasheet

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Connector and Test Point Descriptions

4.1.11 J11 – S+/S–

J11 S+/S– is the sense connection for the input power supply of the dc/dc converters. Connect a

voltmeter, sense connection of a power supply or oscilloscope to this header.

4.1.12 J12 – GND

J12 is the return connection of the input power supply of the dc/dc converters. Connect a power supply

between J10 (VIN) and J12.

4.1.13 J13 – VOUT DCDC1

This header is the positive output of VDCDC1 step-down converter. The output voltage of DCDC1 is fixed

to 3 V (TPS657051) and 2.8 V (TPS657052).

VDCDC1 is capable of sourcing up to 400 mA. A load can be connected between J15 (GND) and J13.

4.1.14 J14 S+/S–

J14 S+/S- are the sense connection for the output of DCDC1. Connect a voltmeter, sense connection of

an electronic load, or oscilloscope to this header.

4.1.15 GND

J8 is the return connection of VDCDC2 output rail. A load can be connected between J13 (VOUT DCDC1)

and J15.

4.2 Enable Jumpers and Switches

4.2.1 JP1 MODE

JP1 selects the forced PWM or Power Save Mode (PSM) operation for the DC/DC converters. Placing a

shorting bar between MODE and PWM ties the MODE pin of TPS655051/2 to VIN, thereby selecting

forced PWM operating mode for the DC/DC converters. Placing a shorting bar between MODE and PFM

ties the MODE pin of TPS657051/2 to GND, thereby selecting Power Save Mode operating mode for the

DC/DC converter at light-load conditions. If Power Save mode is selected, the DC/DC converters

automatically switch to PWM mode at heavier load conditions.

4.2.2 JP2 EN_DCDC1

Placing a shorting bar between EN_DCDC1 and ON ties the enable pin of the DC/DC converter to VIN,

thereby enabling the DCDC1. Placing a shorting bar between EN_DCDC1 and OFF ties the enable pin of

the DC/DC converter to GND, thereby disabling the DCDC1.

4.2.3 JP2 EN_DCDC1

Placing a shorting bar between EN_DCDC2 and ON ties the enable pin of the DC/DC converter to VIN,

thereby enabling the DCDC2. Placing a shorting bar between EN_DCDC2 and OFF ties the enable pin of

the DC/DC converter to GND, thereby disabling the DCDC2

4.2.4 JP4 EN_LDO

Placing a shorting bar between EN_LDO and ON ties the enable pin of the LDO to VIN, thereby enabling

the LDO. Placing a shorting bar between EN_LDO and OFF ties the enable pin of the LDO to GND,

thereby disabling the LDO.

SLVU366–April 2010 TPS657051/2EVM-522 Evaluation Module

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