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Monolithic Flyback switchers for high voltage DC ouput

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sabu31

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Hi all,

I would like to know if there are monolithic switcher ICs for flyback topology to achieve +5kV DC (5 Watts) from standard single phase AC 230V rms. Most of the sites i checked, give upto 1000 V design (LT 8304) . Thanks .
 

Hi,

correct me if I´m wrong...
But doesn´t the output voltage of a flyback depend on winding count (ratio) of the used transformer.

--> The switcher IC will never see the high output voltage.
The switcher IC will just see the DC input voltage (plus spikes)

****
I can´t see that LT8304 can be used for 230V AC input
nor can I see any 1000V ouput voltage specification.
Please clarify.


Klaus
 
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    sabu31

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If you can divide down the o/p volts and have enough power to run an opto or other feedback loop - then you can run most any off the shelf flyback controller ...

kind regards, EP.
 
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    sabu31

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Easy peasy said:
If you can divide down the o/p volts and have enough power to run an opto or other feedback loop - then you can run most any off the shelf flyback controller ...

kind regards, EP.
Click to expand...

Is it possible to use the switcher ICs or general purpose PWM controllers in Open loop.
 

Hi,

"Flyback" and "open loop" is not a good idea.
With low (no) load the output voltage will go unwantedly high ... maybe until a device breaks down in overvoltage.

I recommend to read through some SMPS basics for different topologies.

Klaus
 

open loop means you have no control of Vout, so if you design for a given load and that load is removed the volts will go up to unknown levels - similarly - if you put desired load on you have no idea what actual Vout is ...
 

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