AN1621 300W SECPNDARY控制双开关正激变换器L5991A

AN1621 300W SECPNDARY控制双开关正激变换器L5991A

AN1621
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 trans-
former, whereas the output voltages to be controlled and the housekeeping functions are located on the sec-
ondary 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 sec-
ondary side. This solution offers some advant