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Old 6th November 2006, 10:09 AM   #1
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Default Using Monitor power ic as smps for amplifiers

Im using monitor power ic (DP104c) to make an smps. It uses a flyback topology. The application notes suggest that they can handle loads upto about 300w. Is that a big deal? The ic is very cheap. Dp104c is easily avaialable at less than 1$. It is actually equivalent to fairchild's KA 5Q series switching ics. These device also features a thermal shut down. The advantage of using them is both PWM controller and switching MOSFET are packed inside them. All you need is an optocoupler. I had designed one with them and now powering a 200w amplifier. It works quite fine. But I need to measure how much power it can actually deliver safely. Waiting for ur valuable replies..
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Old 6th November 2006, 12:15 PM   #2
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Can I have the link of DP104C Pls..
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Old 6th November 2006, 02:08 PM   #3
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Default monitor smps

Hi sivan,

Unfortunately they do not provide datasheet of DP104c. These are actually equivalent to fairchild's KA 5Q series. I was experimenting with those power switch ics which was used widely in monitors and tvs. What i experienced so far was excellent performance at the cheapest rates. The problem now is whether it can drive about 300w or not. Thnks for ur reply


datasheet of KA 5q is obtained here:
http://www.fairchildsemi.com/ds/KA/KA5Q0765RT.pdf
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Old 7th November 2006, 01:04 AM   #4
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Hello REjith...
Thanks for the info..I did a Google for the DP104C,and i could'nt find any....
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Old 7th November 2006, 05:30 AM   #5
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Default smps

Hi ,

What do u think about this idea, would expanding it make it possible to drive a 300w amplifier??If so then it would be a great deal ..
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Old 7th November 2006, 05:54 AM   #6
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Default smps

Im attaching the circuit here..
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File Type: jpg monitor smps.jpg (43.5 KB, 298 views)
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Old 7th November 2006, 08:58 AM   #7
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It seems to be a simple flyback with power limited to abt 100Watts
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Old 7th November 2006, 03:36 PM   #8
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Default smps

ya it seems, but the spec specifies it can deliver loads upto about 300w. Moreover, i have been driving a 200w amp out of it. But really needs to make sure how much it can really withstand
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Old 8th November 2006, 03:26 AM   #9
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Why don't you test power with a dummy load !!
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Old 8th November 2006, 04:58 AM   #10
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Those integrated switchers don't have a particular output power rating, what they have is Rds-on and maximum current and voltage ratings like amy MOSFET.

The output power capability of a flyback converter depends on a lot of parameters like input voltage, transformer inductance and saturation current ratings, transformer turn ratios, primary-side switch ratings, secondary side diode ratings and mode of operation (continuous, critical or discontinuous conduction).

The easiest solution to calculate flybacks is to write a small program or spreadsheet because there are a lot of input and output parameters involved.
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