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Old 9th February 2009, 06:27 PM   #1
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Default Boost controller for +48VDC?

I need to find a boost controller to drive a switching MOSFET that will allow me to get +48VDC output, and am going a tad bonkers wading thru data sheets from the various semi vendors.

Perhaps someone who has done something similar could advise a part?

Input voltage: +10VDC to +18VDC
Output voltage: +48VDC
Output current: 4.5 amp (external MOSFET probably required, so a healthy drive current is needed)
Output ripple: 200 mV max
Must have a chip enable
Switching frequency in the 500 KHz to 600 KHz range
Max 50% duty cycle
Low side current sensing needed
No input/output isolation required

Any suggestions for a suitable PWM controller for the above would be much appreciated

Thanks,
Lukas
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Old 11th February 2009, 05:03 AM   #2
dtproff is offline dtproff  United States
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Standard UC3844 would do fine. you will have to use a transformer if you want to limit the duty cycle to 50%. If you use an inductor in a non-isolated boost then the duty cycle would be around 75% and you would use the UC3842.

Tony
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Old 11th February 2009, 03:27 PM   #3
star882 is offline star882  United States
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At that power level, a push-pull converter is a better choice.
http://sound.westhost.com/project89.htm is very close to what you need.
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"Fully on MOSFET = closed switch, Fully off MOSFET = open switch, Half on MOSFET = poor imitation of Tiffany Yep." - also applies to IGBTs!
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