4

Rev. B

11/04

APPLICATION NOTES

MSK 4454 PIN DESCRIPTIONS

+VCC - Is the low voltage supply for all the internal

logic and drivers. A 0.1 µF ceramic capacitor in paral-

lel with a 10µF tantalum capacitor is the recommended

bypassing from the +VCC pin to the COM pin.

H INA, H INB, H INC - Are high active logic inputs for

signalling the corresponding phase high-side switch to

turn on. The logic inputs are compatible with standard

CMOS or LSTTL outputs. These logic inputs are inter-

nally zener clamped at 5.2 volts.

L INA, L INB, L INC - Are low active logic inputs for

signalling the corresponding phase low-side switch to

turn on. The logic inputs are compatible with standard

CMOS

or LSTTL outputs.

These logic numbers are

internally zener clamped at 5.2 volts.

AØ, BØ, CØ - Are the pins connecting the 3 phase

bridge switch options.

AV-, BV-, CV- - Are the connections from the bottoms

of the three half bridges. These pins get connected to

the COM pin. If current sensing is desired they may be

connected to the COM pin through a low value sense

resistor.

+VB - Is the connection used to provide power to the

floating high-side bootstrap supplies in the gate drive

circuitry.

V+ - Is the high voltage positive rail connection to the

tops of the three half bridges.

Proper power supply

bypassing must be connected from this pin to the COM

pin for good filtering. This bypassing must be done as

close to the hybrid as possible.

COM - Is the connection that all hybrid power supply

connections are returned to and bypassed to.