APPLICATION NOTES

IN

MSK 4900 PIN DESCRIPTIONS

VCC - is the bias supply voltage for supplying the input logic

and the power supply for the isolated output. This pin should

be bypassed to GND with a 4.7µF tantalum capacitor and a

0.1µF ceramic capacitor as close this pin and GND as pos-

sible.

GND - is the Vcc supply return for the input logic and the

internal isolated supply. This GND is completely isolated from

the output section. No output returns should connect to this

GND in order to preserve isolation. All Vcc bias supply by-

pass connections should be made as close to this pin as pos-

sible. An input ground plane is the most preferred layout for

assuring good, low impedance ground, shielding of inputs

from noise, etc.

HI - is the input logic pin for commanding the high-side gate

drive to turn on. This logic input is TTL compatible. This in-

put is exclusive OR'd with LO to protect against simultaneous

turn on of both the high-side and low-side gate drive.

LO - is the input logic pin for commanding the low-side gate

drive to turn on. This logic input is TTL compatible. This in-

put is exclusive OR'd with HI to protect against simultaneous

turn on of both the high-side and low-side gate drive.

X FAULT - is an open collector output for indicating either a

de-saturation condition or an undervoltage condition for the

gate drive. This output will be cleared upon activation of

X FAULT CLEAR.

X FAULT CLEAR - is a logic input pin for clearing a FAULT

condition. This input should not be activated until shutdown

of the affected gate is complete. Allow (TBD) µSec after FAULT

before activation of this pin.

X ON - is the gate drive output pin for turning the gate on.

This pin will source TBD current. A separate gate resistor shall

be selected to tailor the turn-on characteristics. This pin will

turn on to +15V.

NOTE: X = HI or LO

X OFF - is the gate drive output pin for turning the gate off.

This pin will sink TBD current. A separate gate resistor shall

be selected to tailor the turn-off characteristics. This pin will

turn off to -5V.

DE-SAT SENSE X - is the input connection for sensing de-

saturation. This pin shall be connected to the collector of the

IGBT. This pin is blanked during switching so that it will not

false trip.

X VDD - is the pin for the floating gate supply voltage. TBD

capacitance shall be connected between this pin and X VSS

as close to the pin as possible. Nominally, this voltage will be

+15V with respect to the RETURN X pin and the emitter of

the IGBT.

X VSS - is the return pin for the floating gate supply voltage.

TBD capacitance shall be connected between this pin and X

VDD as close to the pins as possible. Nominally, this voltage

will be -5V with respect to the RETURN X pin and the emitter.

SS X - is the soft shutdown pin for slowly turning the gate

off after a de-saturation condition. This pin is a separate gate

turn-off path and requires a separate gate resistor for this spe-

cial turn-off approach. The resistor should be sized to keep di/

dt from being too high after the de-sat condition.

RETURN X - is the pin for the emitter reference. This pin will

be at zero volts to +15V to -5V for the gate drive voltage.

3

PRELIMINARY

Rev. - 1/07