AN2816 datasheet(18/36 Pages) STMICROELECTRONICS

18 / 36 page

Getting started

AN2816

18/36

Getting started

The following step-by-step power-up and power-down sequences are provided in order to

correctly evaluate the PM6675S demonstration board performance.

●

Power-up sequence

–

Working in an ESD-protected environment is highly recommended. Check all wrist

straps and ground mat connections before handling the PM6675S demonstration

board

–

Connect power supplies as shown in the PM6675S demonstration board test

setup (Figure 13) and insert the meters in order to perform the desired

performance evaluation. Connect the scope-probes as desired

–

Set the JP1 through JP5 jumpers in order to properly configure the PM6675S

board (default position suggested). Set the SWEN-LEN switches to the on position

(upper position). Do not change jumper settings when the board is powered

–

Set the VCC supply to 5 V±5% and the current limit to 100 mA

–Set the VIN supply to a voltage in the range 4.5 V to 28 V. An initial test at 12 V and

3 A current limit is suggested

–

Set all the loads to 0 A

–

Turn-on the VIN supply

–

Turn-on the VCC supply

–Vary the VOUT load from 0 A to 10 A

–Vary the LOUT load from 0 A to 2 A to test source capability. If a different LDO input

is desired, connect the external rail as dashed in Figure 13 and remove the R6

resistor. All changes must be done when the board is not powered

–Vary VIN supply from 4.5 V to 28 V

●

Power-down sequence

–

Decrease LOUT loads to 0 A

–

Reduce VOUT load to 5 A

–

Decrease VCC supply from 5 V to 3.8 V in order to test the UVLO

–

Increase VCC supply from 3.8 V to 5 V to restart the device

–

Use the SWEN-LEN switches to test soft-start and soft-end on both outputs

–

Turn-off the VOUT load

–

Turn-off the VCC supply

–

Turn-off the VIN supply

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