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Re: power supply noise
What is your board layout like? It is best to build switching power supplies on a single sheet of copper clad board with the component leads as short as possible.
If you have long wires, you will get noise from the switcher itself, get noise induced from your car, noise...
You will have great difficulty. At such a high frequency your switching losses will be high. can you bring the frequency down to something more humane, like 300kHz. this tends to be the sweet spot trading off inductor size against switching loses.
Look at LT and Power Integrations for high...
Try this:
**broken link removed**
It is an apps note I wrote some years ago.
The AS1100 is better. the MAX7219 has some bugs in it - the SPI lines are prone to latching up on startup (they float and hence read erroneous data into the chip). The AS1100 overcomes this, but is an idential chip...
Re: LED DRIVER(MM5450)
I have an application note describing how to drive 8x8 RGB LEDs using an Austria Microsystems AS1100 if this is of any use. Software is done in a PIC
You can use the same circuit to drive 192 individual LEDs if needed
Please let me know
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