I am currently designing a pwm based led driver circuit using the AL8843SP ic from diodes incorporated, it can source maximum 3 A to the output load. The leds i want to operate require 2 A continuous current at 12 V DC but the leds require 5 A peak current for short durations of time (10ms).

My question is if the AL8843 is able to handle that peak output current for short durations of time (the datasheet contains no such information) or what if i use an inductor with saturation current greater than 5 A can anyone help me please

 

Al8843 datasheet link is attached below
https://www.diodes.com/assets/Datasheets/AL8843.pdf

 

It looks like the datasheet states the chip can handle 60W, that's 5A @12V.

 

You could use a supercapacitor to get the 10A 10ms pulse. A .1F would do it, losing only 100mV over the 10ms.

 

The recommended operating current is 2A.
5A peak is 3.5 VRMS, so the maximum current of 3A would be exceeded.

 

It looks like the datasheet states the chip can handle 60W, that's 5A @12V.

It’s also 5V @ 12A, and it doesn’t say it can handle that.

 

I am currently designing a pwm based led driver circuit using the AL8843SP ic from diodes incorporated, it can source maximum 3 A to the output load. The leds i want to operate require 2 A continuous current at 12 V DC but the leds require 5 A peak current for short durations of time (10ms).

My question is if the AL8843 is able to handle that peak output current for short durations of time (the datasheet contains no such information) or what if i use an inductor with saturation current greater than 5 A can anyone help me please

It doesn’t seem to know anything about the current, except for the voltage across the sense resistor, so if you reduce the resistor it will probably run at 5A, although it’s probably not such a good idea. What happens, for instance, if the control circuit gets stuck in the 5A position?
3A is a thermal limit, so if you exceed it briefly and not very often, it’s unlikely to run into trouble.
You definitely will need an inductor that doesn’t saturate at 5A. A saturating inductor could cause it to fail.
Just out of interest, why do you want 5A for 10ms intermittently?

 

leds i want to operate require 2 A continuous current at 12 V DC but the leds require 5 A peak current for short durations of time (10ms).

Please give us the LED part numbers or data sheet.

I have used many Diodes Inc parts. It looks to me that you want 2A LED current which will be 1.9A to 2.1A depending on what inductor you use and ...... but there is no fear of hitting 5A or 3A. This is a "hysteresis" PWM so the on current (1.9 and the off current 2.1 in my example) the current is very accurately controlled.
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Why are we talking bout 5A. Pick the resistor to set the current. The current will ramp up/down within +/+100mA of where you set it.