115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

SLA7050M

UNIPOLAR STEPPER-MOTOR

TRANSLATOR/PWM DRIVER

8

Motor

Driver

Applications Information (cont’d)

Allowable avalanche energy

Waveforms during avalanche breakdown

given +25°C limits, which may be caused by internal

heating during normal operation.

These power MOSFET outputs feature an excellent

combination of fast switching, ruggedized device design,

low on resistance, and cost effectiveness.

Avalanche energy capability. There is a surge voltage

expected when the output MOSFET turns off, and this

voltage may exceed the MOSFET breakdown voltage

(V

and as long as the energy (E

MOSFET by the surge voltage, is less than the maximum

allowable value, it is considered to be within its safe

operating area. Note that the maximum allowable ava-

lanche energy is reduced as a function of temperature.

In application, the avalanche energy (E

by the MOSFET is approximated as

E

Output circuit for avalanche energy

calculations