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Descrição Electrónicos  TPS7A4700EVM-094 Evaluation Module
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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
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Copyright © 2012, Texas Instruments Incorporated


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