AN2787 datasheet(20/37 Pages) STMICROELECTRONICS

20 / 37 page

Getting started

AN2787

20/37

Getting started

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

correctly evaluate the PM6641 demonstration board performance.

Power-up sequence

●

Connect power supplies as shown in the PM6641 demonstration board test setup

(Figure 16) and insert the meters in order to perform the desired performance

evaluation. Connect the scope-probes as desired

●

Set the JP1 through JP8 jumpers in order to properly configure the PM6641

demonstration board. Set the SW1 switches (EN_1S8, EN_VTT, EN_1S5, EN_1S05)

to the ON 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 2.7 V to 3.6 V

●

Set all active loads to 0 A

●

Turn-on the VIN supply

●

Turn-on the VCC supply

●

Vary the 1.8 V (VDDQ) load from 0 A to 4 A

●

Vary the 1.5 V load from 0A to 2.5 A

●

Vary the 1.05 V load from 0A to 3.5 A

●

Vary the 0.9 V (VTT) load from 0 A to 2 A to test source capability. To test sink

capability use the alternative VTT load connection shown in Figure 16

●

Vary VTTREF load to test source capabilty.

Power-down sequence

●

Decrease VTTREF and VTT loads to 0 A

●

Turn-off the 1.8 V (VDDQ), 1.5 V, 1.05 V loads

●

Decrease VCC supply from 5 V to 3.8 V in order to test the input undervoltage lockout

(UVLO)

●

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

●

Use the EN_1S8 and En_VTT switches to enter/exit the S0-S3-S5 states

●

Turn-off the VCC supply

●

Turn-off the VIN supply.

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