MIC4607 Datasheet, PDF (19/42 Pages) Microchip Technology – 85V, Three-Phase MOSFET Driver with Adaptive Dead-Time, Anti-Shoot-Through and Overcurrent Protection

4.4 Overcurrent Timing Diagram
The motor current is sensed in an external resistor that
is connected between the low-side MOSFET’s source
pins and ground. If the sense resistor voltage exceeds
the rising overcurrent threshold (typically 0.2V), all LO
and HO outputs are latched off and the FLT/ pin is
pulled low. Once the outputs are latched off, an internal
current source (typically 0.44 μA) begins to charge up
the external C_DLY capacitor. The outputs remain
latched off and all xLI/xHI (or xPWM) input signals are
ignored until the voltage on the C_DLY capacitor rises
MIC4607
above the V_DLY+ threshold (typically 1.5V), which
resets the latch on the first rising edge of any LI input of
the MIC4607-1 (or falling edge on any PWM input for
the MIC4607-2).
Once this occurs, the C_DLY capacitor is discharged, the
FLT/ pin returns to a high impedance state and all out-
puts will respond to their respective input signals.
On startup, the current limit latch is reset during a rising
V_DD or a rising EN pin voltage to assure normal opera-
tion.
FIGURE 4-4:
Overcurrent Timing Diagram.
 2016 Microchip Technology Inc.
DS20005610A-page 19