Hello
I'm looking for an LED PSU device with either internal or external FETs to power a 3.5V 700mA LED from a nominal 5V supply (so working down to 4.5V). It must be suitable for external shunt FET PWM for high resolution dimming. I've found parts like TPS92510 and LM3405 which meet my voltage/current requirements, but it's not clear to me if they'll cope with shunt FET dimming which would be 14 or 15 bit resolution at about 1KHz. Is there a clear way to identify which devices will do this?
Thanks
Martin