5. We have selected The Allegro A4988 DMOS driver for the system in problem 3.

a. While running with the K0538 motor continuously, should we expect thermal problems with the

driver, assuming nominal (typical) Reson and Ambient temperature? What about the worst case of

b. Maximum Rdson and ambient temperature of 85°C?

b. Now consider the K046B winding: Typical thermals at the driver? Worst Case?

Hint: Slide 32, Lecture 4F.

Hint: You will have 4 calculated power dissipations from parts a and b. Put them on the graph below and

write down your calculations and Justifications.

THERMAL CHARACTERISTICS

Charact

Package Therma

Synes

P

400

306

2.10

2010

1.M

FPC based on JEDEC sta

Power Dissipation varsin Aer Temperature

4.00

8.50

That Condore

20

4

MOR

100

12

Temps, TA (C)

140

196

W UNIT

POW