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High Power LED Driving Solutions - ZXLD1350 Slide 13

To summarize, C1 is a 1 µF ceramic at a voltage rating 10% greater than VIN Max. This must be an X7R not aY5V ADJ can be left floating but if the user wants to increase noise immunity on the pin add a 10 nF ceramic capacitor. C3 reduces ripple current in the LED. Without it the LED is subject to peak currents of +/-15% of the average current. Adding a 1 µF X7R rated at the VIN voltage will reduce this to under about a factor of 3. This has no effect on efficiency or frequency but does increase start up delay.

PTM Published on: 2011-05-24