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I'm looking for a compact solution for 12V->400V conversion. Load current can be expected to be 10mA. What would be the best controller for handling such an exotic conversion in a way that design size stays somewhat reasonable?
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In reply to Peter Meaney:
I see PMP20212 is "close" but would certainly need some work for extra V and I: http://www.ti.com/tool/PMP20212 .
also check www.ti.com/tool/PMP30104 and
For 12 to 400V conversion you can not do a basic boost. The duty cycle would be much too high. Designs with high step up ratio and low current are many times done with a flyback, a multi stage charge pump, or a first stage boost with a reasonable duty cycle followed by some charge pump stages.
Here is one approach;
Multiplied SEPIC Constant Current Capacitor Charger (15Vin to 400V/420Vout @ 80mA) Reference Design
This does have several stages with L and C, and higher current than you need, so may not be a perfect fit.
However it is worth showing.
Another design would be the PMP1435 attached.
This is not on the web, rather in my archives because it is a good demonstration of a boost stage followed by charge pumps.
12Vin to 400Vout at 1mA.
Lower current than requested but I believe it could be increased.
Ed WalkerTexas Instruments Online Support - Systems & Tools
In reply to EdWalker:
In reply to Juha Pesonen:
This design was built and tested.As a result we have Schematic, BoM, Test Results, gerber and board files.The board file is .PCB which is PCAD format. The .SCH is PCAD as wellPCAD can be imported into Altium Designer.
I will attach them to this post.
The user MUST take responsibility for the design if they use it.The design is for reference and not guaranteed to be without error.I have suggested it to many customers and it works very well.
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