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Operation

2.3

Initial Setup and Equipment Interconnect

•

Select the desired V

the Output Voltage Set Note in Section 2.1.

•

Disable the EVM by adding a shorting jumper to J9 from EN (Pin 2) to OFF (Pin3).

•

Before connecting the input power supply to the EVM, verify that the output voltage is set to the

desired supply voltage (+3 V to +35 V range) and that it is current limited to 2 A. With the input power

supply turned off, connect the positive voltage lead (+) from the power supply to V

EVM. Next, connect the ground lead (-) from the power supply to GND (J2, Pin 1).

•

Connect a 0- to 1-A load between V

3

Operation

1. Turn on the input power supply and verify that the output voltage, V

2. Enable the output by reconnecting the jumper on J9 to short the EN (Pin 2) to the ON (Pin 1).

3. Vary the load current and V

NOTE: Note: Power dissipation (P

voltage drop and the output load current, I

dissipation is high, the output voltage may continuously transition on-off-on, due to the

shutdown effect of the thermal limit shutdown circuit.

4

Test Results

This section provides typical performance waveforms for the EVM, characteristic of this design.

4.1

Turn On Characteristic

Figure 1 shows the V

IN pin of the LDO itself when the LDO starts-up into a fully loaded output.

Figure 1. Turn On Sequence

3

SLVU741 – May 2012

TPS7A4700EVM-094 Evaluation Module

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