I'm looking for a PWM controller (or a different solution) for a half bridge in a switched mode power supply (~500 kHz) which can provide a different dead time between the transistion Low -> High and High->Low. All controllers or drivers I found yet just provide the same deadtime for the two transistions.
As an alternative I'm thinking to work with delay elements.
Thanks for your help!Valentin
The LM5105, www.ti.com/.../samplebuy bridge&tisearch=Search-EN-Everything, is a half bridge driver with programmable dead-time but they are symmetrical.
Our latest half bridge controller is the LM5036 again I don't think it has the different dead time between the transistion Low -> High and High->Low, .
The UCC28250/1 is another recent half bridge controller,
For the asymmetrical deadtime you may have to go down the route of implementing discrete delays.
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In reply to Peter Meaney:
Thanks for you answer!I will try to realize it with delays. Any suggestions for adjustable delay components?
In reply to Valentin Zeller:
I have used simple asymmetrical delay networks to slow turn-on and for faster to off.
Turn on is through an RC circuit, the C is maybe some 10's of pF or cap across the gate soucre of the mosfet and turn-off is through a diode with maybe a series resistor which are in parallel with the R in the RC circuit.
I hope this helps.
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