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Half Bridge IR2153 Mosfet death

sunil21

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As a first step to build a Half Bridge , I assembled one with IR2153 and an ATX transformer.
with the frequency set to 40khz (RT - 18k , CT - 1nf) , it was outputting around 26 Volts
2 mosfets - 4n60 (FQPxx... 2.6 amp 600v). initially I had two Bulk caps 100uf/250 volts. I connected the output to load, over 1 amp and all seemed okay. (mosfet , Transformer all very cool). Then I changed the Input capacitor. I made a new input part. connected 1x150uf/450v capacitor followed by two 3.3uf/350v in series. for few days / few testing this was working okay . Then one day during working I heard a sound. No output.
I checked - both mosfets gone. IR2153 gone .. IR2153 VCC- GND is short. so i bought new IR2153 and Two 4n60 . connected a 60w lamp before the bridge . I turned it on and gone again... I checked both Mosfet gone , upper mosfet gate resistance is gone ( resistance value infinity). IR2153 still seemed to work . I connected a 56k (RT) and 4.7uf(CT) and connected two LEDS and they are alternately blinking.

In flybacks when Mosfets die (my cases) , I usually found the Drain-source short (continuity in multi meter). But here The Gate-Drain is found short. So with the 150uf in the input I heard connecting a lamp before it wont save the mosfets.. And today I replaced the burned gate resistor. and mosfets (2X2N60). to the one end of the transformer I have the 1uf/250v capacitor and to the other end I connected a 60w incandescent lamp. Turned it on - again gone... both mosfets... G-D short (no reading for even body diode) What could be the reasons.. so to at least save my mosfets where should i connect the 60w lamp..?
 

KlausST

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Hi,

This sounds like a PCB layout problem.
Maybe a schematic problem.

Please: no textual description of a circuit ... schematics are way more informative and can be understood worldwide.

Klaus
 

sunil21

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IR2153_EX.jpeg

THe Circuit is as shown
 

treez

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Add 18V zeners to gate-source of fets.
Add approx 6r8 resistor in return path of high side gate drive....
Add diode with cathode to switching node connection of chip and anode to ground.
 

sunil21

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There are two diodes connected across both mosfets FR107 (not shown in the schematic).
What about the 150uf bulk capacitor ? too much ? chance for any inrush current issue ?
Like we do in flyback. how/where to connect a 60w lamp for mosfet protection.
Both times, my high sides gate resistors died.

I will connect 18v zener to both mosfet (G-S). If somehow one mosfet dies then the other one will also die?
will connect 6.8ohm to mosfet (high) return path (I have 4.7 and 8.2 ohm in stock - will try 8.2 ohm). will connect this resistor to IR2153 pin 6 - after the capacitor and before the mosfets junction
 

kdolvich

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may be the deal in 10 Ohm gate res. it is less than necessary. sharp switching is tighten requirements for circuits
100 Ohm is optimal, in my opinion.
 

KlausST

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Hi,

10 Ohms vs 100Ohms.
I personally like fast switching and thus rather 10 Ohms.

But as already mentioned, faster switching needs a more elaborated schematic, part selection and PCB layout.

Klaus
 

KlausST

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Hi

The manufacturer's internet pages provide a lot of documents and even videos on how to use this IC.

They are for free an full of essential informations.

Klaus
 

sanjue

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Hi ,everyone;
Vgs damage is more common in the bootstrap driver. I have encountered.

In your example, perhaps you should consider the negative pressure formed on Vgs, which will cause Vgs breakdown or short circuit.

Fairchild has a bootstrap The driver application note details this situation.
 
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Easy peasy

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there are so many things that can be the fault:-
1) bad layout causing undershoot on the mosfet midpoint, killing the driver IC
2) leakage causing overvolt spikes on the mosfets
3) insufficient heat-sinking
4) RFI at higher currents getting into the control
5) blocking cap not needed by the way - as you already have a cap divider - but it would serve to limit max current in the fets
6) over current at startup
7) Too many volts on pin 1 - NEEDS A ZENER 15V 3W ...!
8) output diodes could fail dus to over volt spikes due to leakage - they need snubbers for safety - as do the pri side mosfets ...!
--- Updated ---

p.s. a 60W bulb looks like a short ckt when cold - it is a bad load to use for test on this ckt.
 

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