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Date: 02/01/00 at 2:10 AM
Posted by: Steve Harvey
E-mail: steve.harvey@hbpuk.haldex.com

I need a design for a protected tracking voltage regulator which will give a 5V [0-50mA] output. It needs to be protected against the output
shorting to ground or any voltage up to +30V.

The output voltage needs to track the logic supply (which is 4.75 to 5.25V) so that the regulator output is always within +/-20mV of it at all times.

I have designed the circuit as shown on the referenced diagram [acrobat format] but it does suffer from instability as there is a small'sawtooth' AC signal superimposed on the output.

http://website.lineone.net/~steveharvey/track-reg.pdf

The diode on the output is required to protect against accidental shorting to a supply voltage (typ 24V) as this circuit is to be used on vehicles with nominal 24V DC supplies.

Does anyone know if a better circuit which is of a similarly low cost and complexity OR could suggest a modification that would make the current circuit more stable.

The circuit is to go into a product which may be built in large volumes so it needs to be cheap !

Steve Harvey. AMIEE
steveharvey AT lineone DOT net
http://website.lineone.net/~steveharvey

Follow Ups:

  Re: Tracking Voltage Regulator- Comments on Design Invited John Dunn - Consultant   Posted at: 02/01/00 (0)

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