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3 / 17 page www.ti.com Operation 2.3 Initial Setup and Equipment Interconnect • Select the desired V OUT by programming the output voltage according to the instructions listed above in 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 IN (J1, Pin 1) of the EVM. Next, connect the ground lead (-) from the power supply to GND (J2, Pin 1). • Connect a 0- to 1-A load between V OUT (J3, Pin 1) and GND (J4, Pin 1). 3 Operation 1. Turn on the input power supply and verify that the output voltage, V OUT, is near 0 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 IN voltage as necessary for test purposes. NOTE: Note: Power dissipation (P DISP) across the TPS7A4700 is dependent on the VIN to VOUT voltage drop and the output load current, I Load (PDISP = (VIN – VOUT) × ILoad). If the power 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 OUT ramp-up waveform at turn-on (ENable) as well as the input surge current into the 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 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated |
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