ADP2504-BL1-EVZ Analog Devices Inc, ADP2504-BL1-EVZ Datasheet - Page 3

• Manufacturer Part Number: ADP2504-BL1-EVZ
• Description: Blank ADISimPower Eval ADP2504
• Manufacturer: Analog Devices Inc

Specifications of ADP2504-BL1-EVZ

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

USING THE EVALUATION BOARD
The ADP2503/ADP2504 evaluation boards are supplied
fully assembled and tested. Before applying power to the
evaluation board, follow the procedures in this section and
refer to Figure 8.
SETTING UP THE EVALUATION BOARD
Jumper J6
Jumper J6 enables the part. Connect a jumper between
Position 1 and Position 2 to enable the ADP2503/ADP2504.
Connect a jumper between Position 2 to Position 3 to disable
the ADP2503/ADP2504 and bring the current to <1 μA.
Jumper J5
The ADP2503/ADP2504 can be configured to operate in low
noise pulse width mode (PWM) or in power save mode (PSM),
depending on the SYNC pin polarity. If the SYNC pin is pulled
high (Position 1 and Position 2 connected together), the converter
operates in forced PWM mode. If the SYNC pin is pulled low,
pulse skip mode is turned on when the load current drops
below approximately 75 mA.
Input Power Source
If the input power source includes a current meter, use that
meter to monitor the input current. Connect the positive
terminal of the power source to the VIN terminal on the eval-
uation board, and connect the negative terminal of the power
source to the GND terminal of the evaluation board.
If the power source does not include a current meter, connect
a current meter in series with the input source voltage. Then,
connect the positive lead (+) of the power source to the ammeter
positive (+) connection, the negative lead (−) of the power
source to the GND terminal on the evaluation board, and
the negative lead (−) of the ammeter to the VIN terminal on
the board.
Output Load
Connect an electronic load or resistor to set the load current. If
the load includes an ammeter, or if the current is not measured,
connect the load directly to the evaluation board, with the posi-
tive (+) load connection to the VOUT terminal and negative (−)
load connection to the GND terminal.
If an ammeter is used, connect it in series with the load. Connect
the positive (+) ammeter terminal to the evaluation board
VOUT terminal, the negative (−) ammeter terminal to the
positive (+) load terminal, and the negative (−) load terminal
to the evaluation board GND terminal.
Rev. A | Page 3 of 8
Input and Output Voltmeters
Measure the input and output voltages with voltmeters. Make
sure that the voltmeters are connected to the appropriate eval-
uation board terminals and not to the loads or power sources.
If the voltmeters are not connected directly to the evaluation
board, the measured voltages are incorrect due to the voltage
drop across the leads and/or connections between the evalua-
tion board, the power source, and/or the load.
Connect the input voltage measuring voltmeter positive (+)
terminal to the evaluation board VIN terminal, and the negative
(−) terminal to the evaluation board GND terminal. Connect
the output voltage measuring voltmeter positive (+) terminal
to the evaluation board VOUT terminal and the negative (−)
terminal to the evaluation board GND terminal.
POWERING UP THE EVALUATION BOARD
Once the power source and load are connected to the ADP2503/
ADP2504 evaluation board, the board can be powered for opera-
tion. Ensure that the power source voltage is >2.5 V and <5.5 V.
If using an ammeter, increase the range value to 1 A or 3 A for
the initial startup.
Bring the EN pin high using J6, and monitor the output voltage.
If the load is not already enabled, enable the load and verify that it
is drawing the proper current, and that the output voltage
maintains voltage regulation.
MEASURING EVALUATION BOARD PERFORMANCE
Measuring Output Voltage Ripple
To observe the output voltage ripple, place an oscilloscope
probe across the output capacitors (C2 and C3) with the probe
ground lead at the negative (−) capacitor terminal and the
probe tip at the positive (+) capacitor terminal. Set the oscillo-
scope to ac, 20 mV/division, and 2 μs/division time base.
Measuring the Switching Waveform
To observe the switching waveform with an oscilloscope, place
the oscilloscope probe tip at the end of the inductor connected
to the SW1 pin/SW2 pin with the probe ground at GND. Set the
oscilloscope to dc, 2 V/division, and 2 μs/division time base.
Measuring Load Regulation
The load regulation must be tested by increasing the load at the
output and looking at the change in output voltage. To mini-
mize voltage drop, use short low resistance wires, especially for
heavy loads.
Measuring Line Regulation
Vary the input voltage and examine the change in the output
voltage.
EVAL-ADP2503/ADP2504