SLA7060M datasheet(13/16 Pages) ALLEGRO

13 / 16 page

SLA7060M THRU SLA7062M

UNIPOLAR STEPPER-MOTOR

TRANSLATOR/DRIVERS

www.allegromicro.com

Applications Information (cont’d)

Allowable avalanche energy

Waveforms during avalanche breakdown

caused by increased operating junction temperatures. The

figure provides a normalized on-resistance curve, and all

thermal calculations should consider increases from the

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

(BR)DS). However, the MOSFETs are avalanche type

and as long as the energy (E

(AV)), which is imposed on the

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

(AV)) dissipated

by the MOSFET is approximated as

(AV) = VDS(AV) x 0.5 x ID x t

Output circuit for avalanche energy

calculations

Lead temperature TL [°C) at GND pin (#11) close to the package

SLA7062M

SLA7061M

SLA7060M

SLA7060M Datasheet(PDF) 13 Page - Allegro MicroSystems