ADP2441-EVALZ User Guide

UG-407

Rev. 0 | Page 3 of 12

USING THE EVALUATION BOARD

POWERING UP THE EVALUATION BOARD

The ADP2441 evaluation board is provided fully assembled

and tested. Before applying power to the evaluation board,

follow the procedures in this section.

Input Power Source

The power source voltage must not exceed 36 V, the maximum

operation input voltage of the ADP2441.

Make sure the power source is switched off before connecting it

to the ADP2441 evaluation board. Connect the positive

terminal (T1), and the negative terminal of the power source to

the evaluation board GND terminal (T2). If the power source

includes an ammeter, connect the ammeter in series with the

input source voltage. Connect the positive lead (+) of the power

source to the ammeter positive (+) connection, the negative

(T1), and the negative lead (−) of the power source to the

evaluation board GND terminal (T2).

Output Load

Make sure the evaluation board is switched off before connect-

ing the load. Connect the load directly to the evaluation board,

(T3) and the negative (−) load connection to the GND terminal

(T4). If an ammeter is used, connect it in series with the load:

connect the positive (+) ammeter terminal to the evaluation

to the positive (+) load terminal, and the negative (−) load

terminal to the evaluation board GND terminal (T4).

Once the load is connected, make sure it is set to the proper

current before powering the ADP2441 evaluation board. Before

connecting a load to the output of the evaluation board, make

sure that the output voltage does not exceed the maximum

operating voltage range of the load.

Enabling and Disabling the DC-to-DC Switching

Regulator

In the evaluation board, a voltage divider is used to generate

an enable signal for the IC. As soon as voltage is applied to

Alternatively, header TP1 (EN) is available to enable and disable

the evaluation board. To enable the output, connect the header

the output connect the header TP1 to the GND.

PGOOD Signals

regulation, the logic signal at the PGOOD test point is high. In

a typical application, a pull-up resistor from the PGOOD pin to

the external supply is used to generate this logic signal.

On the evaluation board, the pull-up resistor (R7) is available to

connect to the external supply through the jumper (JP1). Test

Point TP2 is available to connect the external supply of 5 V.

Figure 2 PGOOD Signal

External SS/Track Signal

The SS/TRK pin is multipurpose. It can be used either for

tracking the external supply or for soft start.

A header, TRK, is available on the board for connecting an

external signal to be tracked by the regulator output voltage.

Before applying a signal to the TRK header, make sure the

voltage divider resistor values (R10, R11) connected on the

evaluation board are the correct values (see the ADP2441

data sheet).

Alternatively, to program soft start time, a capacitor can be

connected to SS/TRK pin. On the evaluation board, a 10 nF

capacitor, C11, is connected for a soft start time of 6 ms.

Figure 3. Soft Start Signal

PGOOD

TP2: EXTERNAL

SUPPLY: 5V

JP1

R7

50k

Ω

R10

OPEN

R11

OPEN

C11

10nF

SS

SS/TRK

TRK