What's the maximum output current of STLD40D?

TIENHUA · ‎2024-07-07

Hi Sir,

What's the max output current?

There only shows the min current 20mA of Io.

Thank you.

@STLD40D

Peter BENSCH · ‎2024-07-08

As with any boost regulator, the maximum output current depends on various parameters: output voltage = length of the LED chain, duty cycle, inductance, peak current, ripple current, etc. If you set the maximum peak current to 1A with Rset, you may be able to achieve a current of 35mA instead of 20mA, but this also requires a coil with a corresponding saturation current (min. 2A).

Please also take a look at AN2333, which deals with the dimensioning of the circuitry.

Does it answer your question?

Regards
/Peter

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Peter BENSCH · ‎2024-07-08

As with any boost regulator, the maximum output current depends on various parameters: output voltage = length of the LED chain, duty cycle, inductance, peak current, ripple current, etc. If you set the maximum peak current to 1A with Rset, you may be able to achieve a current of 35mA instead of 20mA, but this also requires a coil with a corresponding saturation current (min. 2A).

Please also take a look at AN2333, which deals with the dimensioning of the circuitry.

Does it answer your question?

Regards
/Peter

In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.

TIENHUA · ‎2024-07-08

Hi Peter,

Thanks for your feedback.

Could you help share the equation of ILIMIT and RSET, ILed and RLED?

I cannot find the equation in datasheet.