MIC4609 datasheet(27/34 Pages) MICROCHIP

Part #	MIC4609

Description	600V 3-Phase MOSFET/IGBT Driver

PDF	34 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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27 / 34 page

 2016 Microchip Technology Inc.

DS20005531A-page 27

MIC4609

Figure 5-5 shows the critical current paths when the

driver outputs go low and turn off the external IGBTs.

Short, low-impedance connections are important

during turn-off for the same reasons given in the

turn-on explanation. Current flowing through the

internal diode replenishes charge in the bootstrap

capacitor, CB.

FIGURE 5-6:

Turn-Off Current Paths.

It is highly recommended to use a ground plane to

minimize parasitic inductance and impedance of the

return paths. The MIC4609 is capable of greater than

1A peak currents and any impedance between the

MIC4609, the decoupling capacitors, and the external

IGBTs/MOSFETs will degrade the performance of the

driver.

xHS

xHB

xHO

VDD

xHI

xLI

VSS

xLO

CVDD

GND

plane

GND

plane

VIN

HS Node

Level

shift

LOW-SIDE DRIVE TURN-OFF

CURRENT PATH

HIGH-SIDE DRIVE TURN-OFF

CURRENT PATH

HS Node

MIC4609 Datasheet(PDF) 27 Page - Microchip Technology

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