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High-efficiency LED drivers target any-colour chips

Posted: 01 Jul 2015 ?? ?Print Version ?Bookmark and Share

Keywords:Ams? LED driver? external resistor?

Ams has developed a line-up of low-dropout LED drivers geared to match current source bias for any colour LED, including white and blue. The AS1111x devices can drive up to four high-current LEDs, stated the company.

The LED current can be adjusted using an external resistor (RSET) and dimmed with an external PWM signal via the EN pin. When the devices are disabled, the supply current drops down to less than 1?A.


Additional features include: up to four channels of 40mA drive (for high brightness LEDs); 150mV headroom to operate (efficiency and battery lifetime); analogue or PWM brightness control with high resolution; no switching noise for EMI-sensitive environments; and fewer external components required.

LED current per output is 40mA to 80mA, with three per cent LED-to-LED matching, from a supply voltage of 0.15V to 3.6V. Packaging is WL-CSP-6, 0.4mm pitch (AS1111A and AS1111B), MLPD-8, 0.5mm pitch (AS1111C) and pricing is from $0.19 (1000).

- Graham Prophet
??EE Times Europe

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