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Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
I believe it's for both diodes. In the datasheet the forward voltage drop is rated at 8 amps per leg, which I assume is maximum. I've noticed that they are pretty sneaky when specifying ratings for those diodes.
Are you building a bench supply? I just so happen to be working on one right now, and finding proper diodes at the right price is quite hard.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Uzzors wrote ...
I believe it's for both diodes. In the datasheet the forward voltage drop is rated at 8 amps per leg, which I assume is maximum. I've noticed that they are pretty sneaky when specifying ratings for those diodes.
Are you building a bench supply? I just so happen to be working on one right now, and finding proper diodes at the right price is quite hard.
No, I just need some fast high current diodes for clamping in my igbt half bridge, one of the 9A ones I had previously, shorted out and took one igbt with it I'll just have to hope that 16A is enough... (its the only cheap diode in this range I can get)
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
You need to be running something insane or have something really bad in the circuit in order to blow 9 ampere diodes from overcurrent. In that case it would be much better idea simply to get IGBT's with diodes.
In SMPS's they almost always use tiny diodes. Like 1 or 2 amps together with transistors rated for 300..400W of power.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Marko wrote ...
You need to be running something insane or have something really bad in the circuit in order to blow 9 ampere diodes from overcurrent. In that case it would be much better idea simply to get IGBT's with diodes.
In SMPS's they almost always use tiny diodes. Like 1 or 2 amps together with transistors rated for 300..400W of power.
I also don't quite know what killed them, but I think it was current spikes, I was running ca. 1kw of power (hard switching). The diodes did not get very hot. As for the igbts, I have a limited source here and the ones I'm using are really cheap for their performance, though without a diode. I think I'll in the end buy several BY500's (cheap) and parallel them for higher peak current.
Edit- A NEW find! I get my components from , but just now I found the MUR1560 600V 15A 30ns schottky, for as little as 17czk ($0.80)! I'll put two in parallel on each "leg" of the bridge, this should be undestructible.
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Dual diode question
I'll just have to hope that 16A is enough... (its the only cheap diode in this range I can get)
