dilandl
Joined: 28 Dec 2007
Posts: 7
Location: Madison Alabama
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 Posted: Sun Dec 21, 2008 9:26 pm Post subject: AEC 9051 Filtered LED Driver Circuit Question |
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This is probably a question for Bob . . . .
I am in the process of building an LED driver that has 4 of the
3021-D-E-1000 Buck Pucks on the same board. I am attempting to parrot
the filter design that Bob used for the AEC 9051 to quiet down the Buck
Pucks but I have a couple of questions:
1. This board will use PWM (100 Hz) from a PIC to control the
intensity of the LEDs attached to it. The Buck Pucks can be "flashed"
at up to 10 kHz by toggling the control pin between 0 and 5V. I have
tested this at 100 Hz and they work very well this way "bare". If I add
the the filter network a-la the AEC 9051 to the LED+ and LED- lines,
will it detrimentally affect the ability to toggle the output of the
Buck Puck on and off at 100 Hz? I suspect that it won't but I'd like a
second (more informed) opinion.
2. Each of the 4 Buck Pucks will have to have it's own filter network
on LED+ and LED-. But I would really like to avoid having to replicate
the filters 4 times for the VIN+ and VIN- lines. If I combined these
into a single filter, would I need to change the inductance and
capacitance values of the components? Inductance and capacitance values
aside, it would seem that I would now have to have an inductor rated
for at least 4A to feed the 4 Buck Pucks. Does that sound right? The
problem there is that a 100uH inductor rated for 4A is physically pretty
large and I'm really trying to keep the size of this thing down. Any
other suggested solutions?
Thanks!
Dan Langhout
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_________________
Dan Langhout
Madison, AL
RV-7 in progress |
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