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5A is the maximum current it can supply, with smaller loads it will draw less current from the supply - it will happily work at 500-700ma. Here is the efficiency curve for it:
So, it is still around 80% efficient at 500ma.
It will deliver 500ma, but it will draw considerably less than 500ma...
How about TPS54560, this design is about 84% efficient:
You could use an LDO regulator to get 3.3v from this 5v out. Do you actually need 5A of current at 5v/3.3v?
How to use INA210 to current sense negative rail?
Hi,
I'm building a dual rail psu with +/-12 volt rails, max 2A per rail output. I'd like to build current sensing into both positive and negative rails, I've chosen INA210 zero drift shunt monitor on cost/performance basis.
It is suitable for...
Hi Erikl,
Great work! That configuration works perfectly in LT spice as it does in your sim. That has saved an op amp and a stage :grin:
Many thanks for solving the problem!
Allan
Correct, it works in the narrow range where the transistor is a good exponential to linear convertor. Didn't know it was called the diode curve though... One of many huge gaps in my knowledge :-)
The oscillator itself consists of a timing capacitor which is charged by an integrator up to a...
Hi eriki,
Many thanks for the schematic. No problem with using +7.5 ref voltage, however the signal from the first op amp is a negative falling slope. It starts at zero volts and falls at the rate of 20mv per 1V input. I think that this circuit assumes a positive going slope starting from zero...
Looking better! There is still a possible issue to resolve though, as the 18mv per octave is approximate and needs to be set to give exactly 1 octave rise in oscillator pitch for 1 volt rise in keyboard control voltage, which is why there is a trimmer in the original schematic to give an...
Hi Brad,
Many thanks for the reply, it would be perfect except that I forgot to mention that it must have the 2K tempco resistor and 175R resistor in the feedback loop of the first op amp :oops:
They have a combined temperature coefficient of 3300ppm/degC which compensates for the...
Hi Everyone,
My first post, so do be gentle with me ;-)
Here's my schematic:
I am designing a vintage style analog monosynth which needs 1 volt per octave input from a Midi to CV convertor.
The base of one side of the pnp expo convertor requires -18mv per octave, which needs to be offset...
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