Quick start

AN2829

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Quick start

1.

Connect VIN+ and VIN- test points of the demonstration board to an external power

supply.

2.

Ensure that all switches of DIP-switch "S2" are "OFF". In this condition all outputs are

disabled (shutdown-mode).

3.

Turn "S21"on (SHDN pin high). The LDO5 and LDO_ADJ outputs turn-on (standby-

mode).

4.

Turn "S22" on (EN1 pin high). The 1.5 V switching controller brings its output into

regulation. The PGood1 pin goes high after soft-start.

5.

Turn "S23" on (EN2 pin high). The 1.05 V switching controller brings its output into

regulation. The PGood2 pin goes high after soft-start.

6.

In order to load the switching outputs, loads must be connected between the "+" and

the "-" output test points, respectively.

7.

In order to load the LDO5 linear output, loads must be connected between J10 and

LDO5 or resistor RLD5V can be mounted on the demonstration board.

8.

In order to load the LDO_ADJ linear output, loads must be connected between J10 and

LDO_ADJ or the alternative resistor R33 can be mounted on the demonstration board.