Definitely not enough info. here. What exactly is the output as it stands ? If it is an op-amp output, then how do you manage to get 5V out of it when your supply is 5V ? - Im guessing you have a rail-to-rail op-amp. If this was the case, I should imagine your op-amp max. output degrades some what at 60mA (e.g. drops a few hundred mV at least).
What are your tolerances for outputs ? Here's a tip for you... take a look at the LM2941, 1A adjustable reg. with as low as 200mV drop-out voltage. Kind regards, Darren Logan BSc(Hons) Development Engineer ------------------------------------------------------- Michell Instruments Ltd tel: +44(0)1223 434 854 Nuffield Close fax: +44(0)1223 434 895 Cambridge www.michell-instruments.com CB4 1SS mailto:[EMAIL PROTECTED] ISO9002 accredited: Q6284 * Member BCAS UKAS accredited: 0179 * Investor in People ---------------The dew point specialists-------------- This communication contains information which is confidential and may also be privileged. It is for the exclusive use of the intended recipient(s). If you are not the intended recipient(s), please note that any distribution, copying or use of this communication or the information in it is strictly prohibited. If you have received this communication in error, please notify the sender immediately and then destroy any copies of it. -----Original Message----- Sent: 02 December 2002 15:09 To: Multiple recipients of list CHIPDIR-L Elbert, you have tell us a little more of what this circuit need to do, like bandwidth, switching speed, voltages, what it is for, etc. if you need simply a limited current source, check out what a LM317 can do for you. Cheers Friedel At 05:04 a.m. 02/12/02 -0800, you wrote: >Hello members, > >I need some help with a current boost circuit. The primary powersuppy of the >circuit is 5V. > >I have an output which is switchable between 1.8V, 3.3V and 5 Volts, >delivering a maximum current of 60mA. However, I need about 200 mA, with a >250mA current limit. I thought about a simple voltage follower opamp circuit >with a current boost circuit at the output of the opamp. I searched on >several websites of the Hardware chapter on the chipdir, but did not find an >applicable circuit. Any ideas? > > >Kind regards, > >Elbert Smit > > >-- >Author: Elbert Smit > INET: [EMAIL PROTECTED] > >Fat City Network Services -- 858-538-5051 http://www.fatcity.com >San Diego, California -- Mailing list and web hosting services >--------------------------------------------------------------------- >To REMOVE yourself from this mailing list, send an E-Mail message >to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in >the message BODY, include a line containing: UNSUB CHIPDIR-L >(or the name of mailing list you want to be removed from). You may >also send the HELP command for other information (like subscribing). -- Author: Friedel Bruening INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Author: Darren Logan INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
