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Registered Member #3859
Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179
I am trying to drive this circuit:
with a signal output from a wide-band amplifier circuit:
Datasheet for MAX4420 - Datasheet for LT1253 -
I need to obtain an output and an inverted output from my amp to drive the two ICs, as I understand.
Should I replace two MAX4420 ICs with UCC37321 and UCC37322 :
Following this analogy: or should I connect my circuit so one MAX4420 receives an input from a pullup resistor, connected to the 12VDC rail and another one receives input from a pulldown resistor, connected to the ground? A single output pin should drive them so a pair of diodes may also be required if I am correct.
Registered Member #3859
Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179
Mads Barnkob wrote ...
The TL494 IC have two output pins that work in push-pull mode in my schematic you linked to. Therefore I used two non-inverted MOSFET driver ICs.
I understood that. In my case I have only one output of a square wave generator.
Mads Barnkob wrote ...
If you only have one output, you could use the MAX4420/MAX4429 or UCC37321/UCC37322.
You could also add a 7414 hex inverter schmitt trigger to invert your signal if you use two of the same MOSFET driver ICs.
What is the minimum and maximum frequency your circuit can drive the flyback transformer under?
I am building an experimental generator that will be able to output a wide range of frequencies. I am building it in modules. What is the frequency range of your circuits? Thank you. --Vladimir.
The UCC chips are good to 1.25MHz depending on the gate drive current required (gate capacitance and GDT impedance) and if you can heatsink them well. Without heatsink and under heavy load I wouldn't expect more than about 500KHz.
Registered Member #3859
Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179
Mads Barnkob wrote ...
The TL494 IC have two output pins that work in push-pull mode in my schematic you linked to. Therefore I used two non-inverted MOSFET driver ICs.
I understood that. In my case I have only one output of a square wave generator.
Mads Barnkob wrote ...
If you only have one output, you could use the MAX4420/MAX4429 or UCC37321/UCC37322.
You could also add a 7414 hex inverter schmitt trigger to invert your signal if you use two of the same MOSFET driver ICs.
What is the minimum and maximum frequency your circuit can drive the flyback transformer under?
I am building an experimental generator that will be able to output a wide range of frequencies. I am building it in modules. What is the frequency range of your circuits? Thank you. --Vladimir.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
You most probably want a core made from a high permeability ferrite material like Fair-Rite type 78 or Ferroxcube 3C90. Hard to say though as you haven't specified what frequency the thing will be running at.
Registered Member #3215
Joined: Sun Sept 19 2010, 08:42PM
Location:
Posts: 780
there should be some on ebay
did you have a look at cheap DDS modules off ebay? most of them are OK to some megahertz, and offer arbitrary waveform generation via serial or parallel input, which enbable you to use any arduino or PIC or even computer to get a signal at a given duty cycle and frequency
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Matching a LT1253-based amplifier and two MAX4420. Two ready-designed circuits.
