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LT4320 active rectifier
LT4320 active rectifier
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Old 22nd October 2013, 12:57 PM   #11
crt is offline crt  Indonesia
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Originally Posted by Refugee1 View Post
The theory is that a diode will be heated by working currant multiplied by forward voltage in watts.
A FET driven by a square wave from the chip will be heated by the currant multiplied by itself and then by the on resistance.
The on resistance of FETs is getting lower every time a new part number is issued. These things now pay for themselves quickly in power savings.
Take a FET with an on resistance of 0.1 ohms and blast it with 10 amps. It will be heated by 1 what.
Take a power diode with a forward voltage of 0.6 volts and blast that with 10 amps and you get 6 whats of heat.
Do have a look at the data sheets in order to work out the power consumption of the parts you have already got.
Sorry you forgot to square those Amperage
so with 10Amp (0.1Ohm RdsOn) ==> 10 Watt dissipation

MOSFET with RdsOn lower than 20mOhm (high current) is easy to get, even in my country
Right now im using 3.1mOhm RdsOn MOSFET
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Old 25th October 2013, 02:02 PM   #12
Refugee1 is offline Refugee1  United Kingdom
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Well spotted. I have seen electric power steering FETs with very low on resistances that would work very well up to about 60 or 70 volts in that circuit.
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Old 25th October 2013, 08:15 PM   #13
ticktock is offline ticktock  Scotland
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Some interesting data:




Not cheap at all:


Invalid Request

Where to get PCBs or even stuffed boards at a reasonable price?
Blaue Leuchtdioden machen blöd. (hb)
sent from NSA monitored device
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Old 10th February 2015, 03:29 PM   #14
andrrewg is offline andrrewg  United Kingdom
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Default Ideal PSU

Although the efficiency gain isn't massive especially at high voltages it does look like a nice way of doing a linear supply compared to a diode bridge. It will never match the efficiency of a SMPS (due to copper losses in the transformer) but its much simpler to build and potentially lower noise.

I'm thinking about designing a PSU using this chip. I would probably design it for +ve and -ve rails up to 72v DC output.

I could also design in transformer soft start using effectively solid state relays (giveing the added bonus of active switch on / off. Of course it could be build up with different components for lower voltage or without the soft start for smaller transformers.

By the way the chip is available in DIP8 package so would be easy to solder. The PCB could be designed with through hole, or just large surface mount components if prefered.

Does that sound interesting to anyone?
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Old 24th February 2020, 07:13 PM   #15
Blitz is offline Blitz  Germany
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Location: Cologne, Germany
Quick question...Do you think one could as well only use one half of this bridge, so basically a CT-transformer (Fullwave vs. Bridge) ?
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