how hard to push xp-l hi

[wight]

@will34

What matters is how many amps you’re pushing, I ran 6.6A through a XPL HI on noctigon with a taskled driver and it killed it instantly. Since then I only run them direct drive, they don’t get past 6A and even in small hosts like the S2+ it works fine.

The part I have italicized/stricken is a bit misleading with the context that follows it.

• Yes, DD is usually safe w/ the LED on a DTP MCPCB.
• Yes, the bond wires on these LEDs will poof easily once a high enough current goes through them.
• DD current is not directly comparable to the current from the TaskLED driver, see below.

The TaskLED driver would either be buck or boost. The output from a typical buck or boost LED driver has peaks higher than the average current. These peaks last long enough to poof those bond wires, so the maximum survivable current from a driver of this type will be lower than the maximum survivable DD current.

Let’s reference RMM from RMM’s MTN-MAXlp thread:

@RMM

An Additional Word of Caution Regarding Maximum Amperage. The MAX16820 is a hysteretic converter with a 10% current ripple, meaning that from the center, or average, current set point, the LED will momentarily experience an additional 5% current over the average set current. This means that if you have an LED that can only handle 6A, you need to set the sense resistor at least 5% below that number.

• Example: 6.1A maximum LED, 0.033 Ohm resistor. If all of the components were ideal and perfect, the 0.033 Ohm resistor should give us 6.06A averagecurrent. This sounds safe, but it’s not. The LED will see peak currents of up to 6.36A, which will blow our theoretical 6.1A maximum LED.