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I have implemented your CAT3224 Flash IC chip in a device that is intended to light 4 HB LEDs (Harvatek HT-N178TWV). Right now, we are not providing enough brightness and I am looking for a way to source more current to each LED. right now, I am using the CAT3224 with the Flash resistor set for 1.9A of flash and have each output connected to 2 LEDs in parallel so that .8-1A goes through each LED. We are looking to source LEDs that can take more current, however we do not have room for another supercapacitor. This does not seem as a big issue as our duration of flash pulse only drains about .75V from the 5.5V supercap and there is capacity remiaining. Is there a way to connect two CAT3224 chips to the same supercap? If not, do you have another similar IC that can provide more power from 1 supercap? Please advise any method that may be used to help us achieve more brightness.
It is possible to use two CAT3224 drivers in parallel with a single supercap to get more LED current. One CAT3224 driver operates in charge mode (CHRG pin low) and drive the LEDs. The other CAT3224 driver should not be used in charge mode (CHRG pin low) but only to drive the LEDs.
Answered by: ON Semiconductor
2011-05-27 01:10:49.0