Evaluation Board User Guide

ADPL42002 Evaluation

Boards

analog.com

Rev. 0

2 of 12

Quick Start

Required Equipment

• A DC power supply

• Multimeters for voltage and current measurements

• Electronic or resistive loads

Procedure

The ADPL42002 evaluation boards are simple to set up to

evaluate the performance of the ADPL42002. See

Figure 1 or Figure 2 for the evaluation board connections,

and take the following steps:

1. Connect the load between the VOUT and GND

terminals.

2. With the input power supply off and turned down,

connect the input supply to the VIN and GND terminals.

Ensure that the shunt of JP1 connects EN to VIN

according to the jumper connection guide. Also ensure

that the shunt of JP2 allows the resistor divider to

program the output to 3.3V according to the jumper

connection guide.

3. With the load turned down, turn the input power supply

on and increase the voltage to 3.8V or higher.

4. Vary VIN from 3.8V to 20V and the load current from 0A

to 200mA. Observe conservative power dissipation

limits and note the following when setting VIN and the

load current:

• An input voltage that is too close to the programmed

output voltage (too low) can cause dropout

operation and a loss of output-voltage regulation.

• The amount of output current combined with an

input voltage that is too high above the output can

increase power dissipation to an unacceptable

level.

5. Monitor regulation and dropout voltage at the VIN, VOUT,

and GND test points.

6. To apply an EN signal externally, reposition jumper JP1

and apply the EN signal to the EN connector.

7. If an output voltage other than 3.3V is desired, change

resistors R1 and R2.

8. An RC network can be installed in the component

placeholder locations in parallel with the top feedback

divider resistor R1 to improve noise performance.

Refer to the ADPL42002 data sheet for details.

9. JP2 is a convenient way to connect the SENSE/ADJ

pin directly to the output if a fixed-output ADPL42002 is

installed. The bottom feedback divider resistor R2 may

be removed as well.

10. A soft-start capacitor can be installed in the C3

placeholder.

On

the

LFCSP

package

version

evaluation board only, monitor the soft start voltage at

the SS test point.