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• OC stands for Over Current; DT/SD stands for Dead
Time and Shut Down.
• The DT (dead time) is defined as the time period from the
starting point of turn-off on one side of the switching
stage to the starting point of turn-on on the other side.
• DT/SD pin provides two functions: 1) setting deadtime
and 2) shutdown. There are 4 modes of DT pre-
programmed in IC.
• The IRS20124 determines its operation mode based on
the voltage applied to the DT/SD pin. An internal
comparator translates which mode is being used by
comparing internal reference voltages.
• Since IRS20124 has internal dead time generation, if
independent inputs for HO and LO are no longer
provided; shutdown mode is the only way to turn off
both MOSFETs simultaneously to protect them from over
current conditions.
SUP. 7note
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