LTspice: Splitting a gate drive into two separate gate drive pulse streams?

[Flyback]

Hi,

I wish to simulate a Half Bridge SMPS in LTspice, but using the LT1243 adapted to control it.

I need to split the gate drive in to two separate streams as in the attached.

Would you say D flip flop for each stream would be best to achieve these two streams?

 

[ronsimpson]

Because you are using LTspice: Use LTC3721

 

[Flyback]

Thanks Ronsimpson, the LTC3721 has slope compensation and a rather low current sense voltage reference, and takes longer to simulate.
The LT1243 is very simple and straightforward.
(I like the LTC3721 though and if i was doing it on the bench i would consider using it in some cases.)

The attached (LTspice and schem) shows how it can be done with the LT1243 …but I am getting an unfortunate little spike in the waveform streams as shown.

Any better ways?

 

[alec_t]

Your little spike may be a sim artefact. Putting even 1pF in parallel with S1 or S2 increases the spike dramatically.