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Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
The FSFR2100 is a resonant zvs half bridge thing with built in 13A 600V .38 ohm mosfets. They also make a version that you can use your own FETs with (FAN7621). I plan on using it to drive my x-ray machine's flyback, and I'll report on whether or not it works. I think the external fet IC could be very useful as a reliable half bridge SSTC controller, and it's up to someone else to prove me right or wrong.
Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
I dunno, I'm the one who gave him the thing, But I wondered if it could be used for Induction heating purposes, keeping it locked on resonance with the feedback.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Inducktion wrote ...
I dunno, I'm the one who gave him the thing, But I wondered if it could be used for Induction heating purposes, keeping it locked on resonance with the feedback.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Patrick wrote ... It allows for feedback too, would that be useful for stabilizing HV, for your Xray stuff?
Could be. But the optoisolator LED current (5 mA?) could be a significant load at x-ray voltages, with significant power in the current-limiting resistor.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Klugesmith wrote ...
Could be. But the optoisolator LED current (5 mA?) could be a significant load at x-ray voltages, with significant power in the current-limiting resistor.
Yes, I was contemplating that.
Perhaps a few dozen uA could be snaged via HV resistor then a transistor powered at LV could have base amplification to drive the LED-OPTO indirectly? Or am I totally crazy ?
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
So... I can't use this IC for my flyback driver. It has a maximum power dissipation of 12 watts, so because of I²R I can only put 5.5 amps through it (.38 ohms RDSon). Grr... looks like I'll have to get an external mosfet one.
Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
I don't know if this is an ideal solution. I see this IC is made for LLC-topology operation, and to be honest I don't really know all that much about the LLC topology, but something tells me it's going to be a bit trickier to design than something based on say a hard-switched or SLR halfbridge.
I do hope that I'm wrong though, as I have a similar problem I'm trying to solve, and it would be fantastic if something as simple as this works well.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
By looking at the datasheet and how the pwm is controlled, it looks very easy to use. I'm going to get the external fet ones to play with, but since I don't plan on using this one I could possibly toss it into an envelope and send it to you to fiddle with.
Edit, the external fet one is out of stock on DIPs. Gahh looks like I'll have some tiny soldering to do. :-/
Registered Member #3610
Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506
Klugesmith wrote ...
Patrick wrote ... It allows for feedback too, would that be useful for stabilizing HV, for your Xray stuff?
Could be. But the optoisolator LED current (5 mA?) could be a significant load at x-ray voltages, with significant power in the current-limiting resistor.
That's not a problem. The xray anode current will typically be somewhere in the range of 4-10mA for a dental unit. You don't need to pass the anode current directly through the opto though, you can use an op-amp to buffer and scale the drop across a current sensing resistor as needed.
High frequency supplies with a cockroft-walton multiplier will have a large sag under load, so regulation is almost essential unless you are really careful to ensure that the filament in the tube is always hot prior to activating the HV. It's easily possible to exceed 120kV with no load.
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This is a neat little IC
