Output diode reverse recovery time selection for Flyback design
Hi,
I am currently using TNY264 IC for one of our flyback design which is having a dual output of 12V, 50mA &
5V, 125 mA.
I have a query regarding the reverse recovery time requirement for the selection of the output rectifier diode.
The flyback design is operating in continuous conduction mode, can i use a diode of 100 nSec reverse recovery time
or should i go for lesser reverse recovery time and what is impact of higher reverse recovery time of secondary
rectifier diode.
Please send me the details, Thanks in advance.
Comments
The output voltage is not stable ..
Any recoemndaiton...
| Attachment | Size |
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| LinkSwitch-Schematic.pdf (41.19 KB) | 41.19 KB |
Hello,
Thank you very much for consider using PI products. I think this is a new topic not related to the original topic. In order not to confuse the dicssusion, i recommend you create a new topic in the forum.
LNK454/456-458/460 LinkSwitch-PL Family is LED Driver IC with TRIAC Dimming, Single-Stage PFC and Constant Current Control for Non-Isolated Applications. Is your applictaion LED driver related? if so, you should put this to the LED section.
As you mention the voltage is not stable, this is a constant current design, what's your load condition? can you give more details about your application. it will be helpful to us to understand the issue
Best Regards
Hello Kunal J,
Sorry for the late reply.
Continuous mode operation (KDP < 1 ) provides higher output power. In this mode a Schottky output diode should be used to prevent long diode reverse recovery times that could exceed leading edge blanking period (tLEB). The big current spikes during turn-on period caused by capacitance and secondary-side rectifier reverse recovery time will not cause premature termination of the switching pulse.
Best Regards