Irs2153
- Thread starter b_force
- Start date
You cannot use IR2153 for regulated SMPS, since its not a PWM chip. Its a fixed frequency SMPS chip
Regards.
I think "fixed frequency SMPS chip" is giving it too much credit as what's an SMPS without a PWM. It's simply a high and low side gate driver IC running off its own oscillator apparently with a fixed duty cycle and dead time.
That's not to say it is of no use in SMPS though. There are some more complex SMPS which for one reason or another incorporate a fixed frequency fixed duty cycle oscilator driven main switching transformer purely for isolation. Regulation is performed separately by e.g. a buck converter. Essentially a primary side PWM controlled buck converter regulates the bus voltage (or current) that the main switching transformer sees, and the main transformer passes the energy across the isolation boundary in a highly efficient way. All this is beside the point, but I find it interesting
Further reading:
http://sva.ti.com/AU/design/courses/214/print.htm#01cas05
That's not to say it is of no use in SMPS though. There are some more complex SMPS which for one reason or another incorporate a fixed frequency fixed duty cycle oscilator driven main switching transformer purely for isolation. Regulation is performed separately by e.g. a buck converter. Essentially a primary side PWM controlled buck converter regulates the bus voltage (or current) that the main switching transformer sees, and the main transformer passes the energy across the isolation boundary in a highly efficient way. All this is beside the point, but I find it interesting
Further reading:
http://sva.ti.com/AU/design/courses/214/print.htm#01cas05
vectrix150v
New member
It is an interesting concept, I can see some value with this in a project I am working on at the moment (an unisolated buck converter) - while it is isolated from a user, a truly isolated converter would be a lot safer!
the voltage fed buck cascade essentially simplifies to a voltage ratio between a buck converters LC filter and a second output filter. the current fed one simplifies to a current ratio between the buck converters L and C.
it is interesting, but usually if you want a buck derived converter with isolation, you'd use a forward, push pull, half bridge or full bridge converter.
it is interesting, but usually if you want a buck derived converter with isolation, you'd use a forward, push pull, half bridge or full bridge converter.