L6208PD datasheet(25/35 Pages) STMICROELECTRONICS

25 / 35 page

DocID7514 Rev 2

25/35

L6208

Application information

Figure 25. Typical application

8.1

Output current capability and IC power dissipation

In Figure 26, 27, 28 and 29 are shown the approximate relation between the output current

and the IC power dissipation using PWM current control driving a two phase stepper motor,

for different driving sequences:



HALF STEP mode (Figure 26) in which alternately one phase / two phases are

energized.



NORMAL DRIVE (FULL STEP TWO PHASE ON) mode (Figure 27) in which two

phases are energized during each step.



WAVE DRIVE (FULL STEP ONE PHASE ON) mode (Figure 28) in which only one

phase is energized at each step.



MICROSTEPPING mode (Figure 29), in which the current follows a sine wave profile,

provided through the Vref pins.

For a given output current and driving sequence the power dissipated by the IC can be

easily evaluated, in order to establish which package should be used and how large must be

the on-board copper dissipating area to guarantee a safe operating junction temperature

(125 °C maximum).

L6208PD データシート(PDF) 25 Page - STMicroelectronics