MIC4609 datasheet(21/34 Pages) MICROCHIP

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 2016 Microchip Technology Inc.

DS20005531A-page 21

MIC4609

FIGURE 4-7:

MIC4609 Motor Driver Typical Application – Phase A.

4.8

Overcurrent Protection Circuitry

The MIC4609 provides overcurrent protection for the

3-phase bridge. It consists of:

• a comparator that senses the voltage across a

current-sense resistor

• a latch and timer that keep all gate drivers off

during a fault

• an open-drain FAULT pin that pulls low during the

fault.

Figure 4-8 illustrates the overcurrent protection

sequence. When an overcurrent condition is detected,

the FAULT pin is pulled low and a latch disables the

gate drive outputs for a time determined by the RCIN

pin capacitor. After the delay circuit times out, the latch

is reset, the FAULT pin is deasserted to a high

impedance state and the gate drive outputs are

re-enabled.

AHS

AHB

AHO

VDD

ALO

Level

shift

COM

VIN

CVDD

RHS

DCLAMP

DBST

VSS

Phase B

Phase A

Phase C

RSNS

VIN

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