AN4382 datasheet(48/70 Pages) STMICROELECTRONICS

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User interface

AN4382

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DocID025437 Rev 1

The LED can be switched off using parameter 0. Once the LEDs are switched off with the

command “ll”, then the LED can only be switched on again via the command “ll”

(and not 0 - 10 V or DALI).

The STEVAL385LEDPSR demonstration board also limits the resonant output current

variation rate to a maximum of 333 mA /second, in order to preserve both the output

capacitors and the LED string.

Caution:

Take care when using this command. The board injects the configured LED current

independently from the LED ratings. The user shall configure a current level not greater than

the maximum current allowed by the LED strings connected.

The correlation from output current and “ll” value is not linear. Table 14 defines the value for

a selected number of output current values correlated with “ll” value:

Table 14.

“ll” <-> output current relation

Syntax:

ll val

Parameters:

•

val [0,2-4096]: configure the output current level.

–

0: switch off the LED

–

2-4096: set the output current. The STEVAL385LEDPSR supports currents in the

range 539-3450.

Output:

Default:

none

Example: ll 539:

set the minimum LED current level.

“ll” value

Output current (1 A scale)

Output current (500 mA scale)

0Off

Off

539

10 mA

5 mA

660

100 mA

50 mA

795

200 mA

100 mA

935

300 mA

150 mA

1070

400 mA

200 mA

1380

500 mA

250 mA

1770

600 mA

300 mA

2175

700 mA

350 mA

2600

800 mA

400 mA

3020

900 mA

450 mA

3450

1000 mA

500 mA

AN4382 Datasheet(PDF) 48 Page - STMicroelectronics

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