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ADP5140-EVALZ
User Guide
USING THE EVALUATION BOARD
POWERING UP THE ADP5140-EVALZ
The ADP5140-EVALZ is supplied fully assembled and tested.
Before applying power to the ADP5140-EVALZ, take the
following steps:
1.
Short the two pins on the S1 jumper to connect the
VOUT2 pin to the PVIN56 pin on the ADP5140-EVALZ
and provide the power supply to Regulator5 and Regulator6.
2.
Short the two pins on the S2 jumper to connect the
VOUT3 pin to the PVIN78 pin on the ADP5140-EVALZ
and provide the power supply to Regulator7 and Regulator8.
3.
Short the two pins on the S3 jumper to connect the
VOUT3 pin to the PVIN9 pin on the ADP5140-EVALZ
and provide the power supply to Regulator9.
4.
Short the EN pin to the VIN pin on the J10 jumper to enable
all regulators.
5.
Short the SEQ pin to the VIN pin on the J2 jumper for all
regulators to start up in sequence.
6.
Short the VIO pin to the VOUT11 pin on the J21 jumper
to select 3.3 V as the input/output voltage if the
CABLEZ
serial interface is used. If the VIO pin is shorted
to the VOUT5 pin on the J21 jumper, a 1.8 V input/output
voltage is used.
Input Power Source
If the input dc power source includes a current meter, use the
meter to monitor the input current. Connect the positive
terminal of the power source to J3 (VIN) of the ADP5140-EVALZ
and connect the negative terminal of the power source to J1
(GND) of the ADP5140-EVALZ.
If the dc power source does not include a current meter, connect a
current meter in series with the input source voltage. Connect the
positive lead of the power source to the positive ammeter terminal,
connect the negative lead of the power source to J1 (GND), and
connect the negative lead of the ammeter to J3 (VIN).
Output Load
Before connecting the load, ensure that all regulators are turned
off. Connect an electronic load or resistor for each regulator to set
the load current.
Using the Buck1 regulator as an example, connect the positive
terminal of the load to J4 (VOUT1) of the ADP5140-EVALZ and
connect the negative terminal of the load to J6 (GND).
Input and Output Voltmeter
Measure the input and output voltages using voltmeters. Ensure
that the voltmeters are connected to the appropriate terminals of
the ADP5140-EVALZ and not to the load or the power source.
If the voltmeters are not connected directly to the ADP5140-
EVALZ, the measured voltages are incorrect because of the voltage
drop across the leads and/or connections between the ADP5140-
EVALZ, the power source, and/or the load.
To measure the input voltage, connect the positive terminal of
the voltmeter to the TP45 test point (VIN_SNS) and the
negative terminal to the TP46 test point (GND_SNS). Using
Buck1 as an example, to measure the output voltage of Buck1,
connect the positive terminal of the voltmeter to the TP1 test
point (VOUT1_SNS) and the negative terminal to the TP3 test
point (GND_SNS). The measurement method of the output
voltage for the other regulators is the same as for Buck1.
Turning On the ADP5140-EVALZ
When the power source and load are connected to the ADP5140-
USB-SDP-
EVALZ, the ADP5140-EVALZ can be powered for operation.
Take the following steps to turn on the ADP5140-EVALZ:
1.
Ensure that the S1, S2, S3, J10, J2, and J21 jumpers are
connected correctly.
2.
Set the input voltage to 3.7 V and turn on the power supply.
3.
Ensure that each regulator outputs the correct voltage.
4.
Turn on the load and ensure that the load is drawing the
load current that was set.
5.
Verify that the output voltage maintains its regulation.
MEASURING EVALUATION BOARD PERFORMANCE
Measuring the Switching Waveform
To observe the switching waveform of the ADP5140 with an
oscilloscope, place the oscilloscope probe tip at the TP28
(SW1), TP33 (SW2), TP37 (SW3), TP29 (SW4), and TP44
(SW12) test points with the probe ground at any ground test
point, such as TP39 (GND) or TP47 (GND). Set the oscilloscope
to dc with the appropriate voltage and time divisions. The
switching waveform limits alternate approximately between 0 V
and the input voltage (for a buck regulator) or output voltage
(for the boost regulator).
Measuring Load Regulation
To test the load regulation of the ADP5140, observe the change
in each output voltage when increasing each output load current.
To minimize the voltage drop, use short, low resistance wires.
Load Transient Response
Generate a load current transient at each output and use an
oscilloscope to observe the output voltage response. Attach the
current probe to the wire between the output and the load to
capture the current transient waveform of the ADP5140.
Rev. 0 | Page 3 of 10
UG-1861
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