AN2650 datasheet(22/26 Pages) STMICROELECTRONICS

tên linh kiện	AN2650

Giải thích chi tiết về linh kiện	L9942 stepper motor driver for bipolar stepper motors

PDF	26 Pages

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Power dissipation

AN2650

22/26

DocID14109 Rev 3

7.2

Static freewheeling

Only the RDS,on of the high and low side switches are used for free wheeling and

generating power dissipation.

7.3

Dynamic slew rate power dissipation

During the H-bridge switching, the voltage and the current chang in a triangular form with

the defined slew rate.

7.4

Power dissipation for one PWM phase

The temporary power dissipations, explained above, are summed for the complete PWM

phase.

Pulse

r f

⁄

–

-------------------------------







Pulse

r f

⁄

–

-------------------------------------------







r f

⁄

⋅

-----------------







⋅⋅

⋅

r f

⁄

⋅

–

----------------------------







r f

⁄

---------

⋅







⋅

P2 R

DSON I

r f

⁄

⋅

–

----------------------------







⋅

2U I

r f

⁄

---------







⋅⋅ ⋅

⋅⋅

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