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LM5117: maximum time of t_on and t_off

Ohad Bonneh
Intellectual 1960 points
Part Number: LM5117

Tool/software:

I would appreciate your help regarding the times in the attached image.

 

Can the min/ max Duty Cycle be calculated based on these times using the following equations?

 

For example, if I want D=98% and T_sw=5usec, so ton=98%*5usec=4.9usec and t_off= 100nsec. Is this scenario possible?

  • 0
    TI__Guru 58601 points

    Hello Ohad

    As it is mentioned in the EC table, there is a forced off time which is 440ns (max), this means when Tsw=5us, the maximum duty cycle which you can achieve is 91.2% (1-440n/5u = 0.912). The off-time cannot be less than the forced HO off-time which is 260/320/440ns [MIn/Typ/Max]

    -EL