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.

High accurate, wide dynamic range, high side current sense

Status
Not open for further replies.

wfang

Newbie level 4
Joined
Dec 26, 2003
Messages
7
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
60
Anyone has done or has any idea on how to design a current sense circuit to fit below requirements:

1. DC high side current sense and always online (no current break during messurement).
2. DC input range 3~5V (sense circuit works on 5V)
3. Current input range: DC 1mA ~ 2A, 5% resolution at full range
4. Whole circuit voltage drop shall less than 100mV at full rage (1mA ~ 2A)
5. Sensor Op Amp Voltage output 0~5V, can be multiple output for different current range. (e.g. Op amp 1 for 0~100mA, op amp 2 for 100mA~2A range)
6. Output Shall support ADC sample rate at least 1s/s
7. Shall auto switch range in less than 0.1ms if multiple range measurement applied.

I have implemented high site current sense circuit work fine at 100mA~2A range with 5% resolution. but couldn't tune it to get same resolution at 1mA~100mA range.

Any suggestions would be appreciated.

Wei
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top