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Sanjib.A
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Re: Very much useful
Sanjib.A   9/11/2013 1:02:56 PM
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Hi Max, Thanks a lot for sharing the guide. This is a pretty elaborated description about the calibration methodology and the advantages of the newer devices with advanced current sensing technique, which make the calibration easier. I am also impressed to see the option for "no calibration", where the "typical" slope and offset correction factors could be used from the datasheet instead of adding a calibration process during production...this is good for the application where accuracy is not that important. Thanks!

Max The Magnificent
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Re: Very much useful
Max The Magnificent   9/11/2013 1:28:50 PM
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@Sanjib.A: Hi Max, Thanks a lot for sharing the guide.

It's my very great pleasure -- I think it contains a lot of useful information.

Brian@BDH
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Re: Another approach to current monitor
Brian@BDH   9/11/2013 3:58:31 PM
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@Aubrey: Re: Do you know if there is a data sheet available? Perhaps it is still preliminary.

Yes, the datasheet is in Max's inbox - I asked him to forward it to you since I didn't have your email address readily available :-) 

Correct, the part does not launch in production until Dec13/Jan14, so the datasheet is still a Target datasheet and the Final datasheet has not been released on the website yet.  However, samples are available!

 

salbayeng
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smart PWM "mosfets"
salbayeng   11/21/2013 7:29:49 AM
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Hi Aubrey , 

More good stuff in your blog as always.

Unfortunate that the only units with status indication, the ZXMS6002G and ZXMS6003G have a feeble 500mohm  Rds , what kind of automative load only uses 1A? , heck a simple PTC placed in close proximity to the MOSFET tab would provide sufficient protection for a 12v / 1A load.

Have you seen the DRV101 , in a TO220 5pin  package , meant for solenoid driver, hits it hard at first then throttles back to PWM, interestingly it has a fault output for both under and overcurrent. 

http://www.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=drv101&fileType=pdf 

I've also looked at using the UC2845 (usually a current mode flyback PWM driver) driving any old mosfet. If you average the PWM signal (while it's running closed loop)   as an analog voltage , you can determine whether it is open or short circuit. But it won't go to 100% duty so only good for bulbs and coils / motors.

Underdriving the gate is a big MOSFET killer , so some kind of de-saturation detector would be helpful.

antedeluvian
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Re: smart PWM "mosfets"
antedeluvian   11/21/2013 9:42:26 AM
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salbayeng

I've also looked at using the UC2845 (usually a current mode flyback PWM driver) driving any old mosfet. If you average the PWM signal (while it's running closed loop)   as an analog voltage , you can determine whether it is open or short circuit.

This is a great idea. You shoul;d submit it to EDN's Design Ideas- make yourself a few bucks.

 

Have you seen the DRV101

Thnaks for the pointer. I recently saw a TI part, but was only rated to 20V, for automotive applications. This one I can use!

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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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