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LM3414HV: increase input capacitor for PWM

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Part Number: LM3414HV

Hello 

i am using the following configuration for my light system. 

The driver is connected to 2 serial Cree xhp35 using 26V with 1A .

I want to increase the number of LED in my system but the battery of my robot cannot support enough peak current for driving all my LED (i have a around 20 Led driver in my system)

i am using the LEDs in PWM for a short 5ms exposure time at rate of 4 HZ. 

I Want to use a big capacitor but i am not sure where to locate it in the schematic.  in addition when i am adding the capacitor how will i know the charging time of the capacitor  ? i i dont know the Resistance of the driver  (t = RC) 

Thanks 


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