MP172– NON-ISOLATED OFF-LINE REGULATOR
Leading-Edge Blanking
An internal leading-edge blanking (LEB) unit
avoids premature switching pulse termination
due to a turn-on spike. A turn-on spike is caused
by parasitic capacitance and reverse recovery of
the freewheeling diode. During the blanking time,
the current comparator is disabled and cannot
turn off the external MOSFET. Figure 5 shows
the leading-edge blanking.
IDS
350ns
ILIMIT
t
Figure 5—Leading-edge blanking
MP172 Rev. 1.0
9/30/2015
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