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Recommend stepdonw drifer power supply.

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carpenter

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Recommend stepdown driver for power supply.

I have digital communication devices originally intended to operate from battery.
- supply voltage 4V
- supply current in standby about 1mA
- supply current in full operation mode 100mA at 5ms, follow burst 2A at 0,5ms etc.
- maximum allowable ripple 150mV
This device is blocker 220uF tantalum capacitor.

Power supply Requirements
-Input voltage 8-35V typically 12V
- only with ceramic and tantalum capacitor
-further decisions, size od boom, price and availability
For testing I use power supply with LM2596-Adj this woks fine, bud need to find a better driver.
It is for this kind of use of a suitable synchronous driver, for example, MIC28510

In short, what do you recommend?
 

Re: Recommend stepdown driver for power supply.

carpenter said:
- supply current in full operation mode 100mA at 5ms, follow burst 2A at 0,5ms etc.
- maximum allowable ripple 150mV
Click to expand...

The LM2596 is a buck converter module.

I guess it is asked to provide 2A suddenly? Is the problem that the output drops at such times?

Can you get 2A from your original 8-35V power source? If you cannot, then your buck converter is not likely to either.

Have you tried putting a large capacitor, several thousand uF, where it can supplement the buck converter when 2A is demanded? (To do this you may need to resort to an electrolytic.)

It might help to give the 2A device its own power supply.
 

PS with LM2596 works fine with 2x470uF Ultra Low ESR and 220uF LowESR tantalum in second filter + 10uF ceramic nearly powered device. It is also a recommendation design. The problem is the size.
Probably try Constant On-time Step-Down LM25011
 

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