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Re: [Paparazzi-devel] YAPA2 help needed "SOLVED"

From: Chris
Subject: Re: [Paparazzi-devel] YAPA2 help needed "SOLVED"
Date: Fri, 10 Aug 2012 10:46:52 +0300
User-agent: Mozilla/5.0 (X11; Linux i686; rv:14.0) Gecko/20120714 Thunderbird/14.0

I did some calculations after downloading the INA169 manual and the Attopilot schematic
The results are horrifying.
The current sensor's output is not current limited as it does not have any resistor in line with the output and the output follows the I*Rs *(72.3K/1K) formula (72.3K/1K is the op-amp's gain) Assuming a surge current of 100A which is low when thick wiring, low ESR capacitors
and high voltage is used we get an output of 7.23v with no current limiting.
A 150A surge current  will give an output of 10.8v Arggghhhh.....

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