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Download st docs - Computer power supply, dc power supply, atx , switching, high voltage, uninterruptible power supply, laptop and other service manual and repair information.

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File name:24v 13a.pdf
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Descr:24V 13aA power supply
Group:Electronics > Consumer electronics > Power supply >
Uploaded:2013-11-13 18:07:48
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24v 13a.pdfAN1621 APPLICATION NOTE 300W SECONDARY CONTROLLED TWO-SWITCH FORWARD CONVERTER WITH L5991A 1 INTRODUCTION A typical off-line isolated switch-mode power supply has the controller located on the primary side of the transformer, whereas the output voltages to be controlled and the housekeeping functions are located on the secondary side. Usually the voltage feedback signal is transferred to the primary controller by using an optocoupler or a transformer. We want to propose here an asymmetrical half bridge forward converter with the controller located on the secondary side. This solution offers some advantages: direct use of the on-board voltage reference no need of the opto feedback, with its temperature and ageing gain dependence available on-board housekeeping functions eliminates the need of an additional dedicated device negligible extra cost on the gate drive transformer to satisfy safety requirements The controller operating on the secondary side requires a specific concept

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