Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Fast linear LED driver (20mA)

Status
Not open for further replies.
I

ilmenauer

Newbie level 1
Joined
Jun 1, 2002
Messages
1
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
8
20ma led driver

Hi,
I'm trying to develop LED driver for biological exercises. LED lighting must be fast switched on and off (slope below 0.5us) and programed with 1% resolution. Maximum current is 20mA.
It is a part of uC standalone unit.
I searched for 0-20mA line drivers but they are too slow. Have found opamp MAX4165 with 80mA output but this is too slow.
Also 30mA output DAC the MAX5550 has non acceptable settling time of 30us :(

I'd be grateful for any solution advices.
Kind regards,
Ilmenauer
 

driver 20ma

It should work with any fast OP controlled current source. MAX4185 is obviously too slow. Also a video DAC can drive 20 mA directly with ns rise times, but this solution would be needed only for arbitrary waveform generation.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top