ACPL-K34T View Datasheet(PDF) - Avago Technologies
Part Name
Description
MFG CO.
'ACPL-K34T' PDF : 15 Pages View PDF
To prevent cross-conduction between high side and low side power transistors, minimum dead time (DT MIN) must
be introduced to the system. For example, given DTD MIN = -40 ns and DTD MAX = 50 ns, if designers target to have
minimum dead time (DT MIN) of 20 ns after the optocoupler, then initial dead time (DT) needed for the system can be
calculated as:
DT = DT MIN – DTD MIN
= 20ns – (-40ns)
= 60ns
Maximum dead time (DT MAX) after the optocoupler can be calculated as:
DT MAX = DT + DTD MAX
= 60 ns + 50 ns
= 110 ns
By introducing DT = 60 ns, the overall system dead time can vary from 20 ns to 110 ns due to the optocoupler’s DTD.
Note: The propagation delays used to calculate dead time distortion (DTD) are taken at equal temperatures and test
conditions since the optocouplers used are typically mounted close to each other and are switching the same type of
MOSFETs.
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