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AN2650 Fiches technique(PDF) 21 Page - STMicroelectronics

No de pièce AN2650
Description  L9942 stepper motor driver for bipolar stepper motors
PDF  26 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2650 Fiches technique(HTML) 21 Page - STMicroelectronics

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DocID14109 Rev 3
21/26
AN2650
Power dissipation
25
7
Power dissipation
The calculation of the power dissipation depends upon the selected slew rate and decay
mode of the device. In Figure 12 the set up was selected with a fast decay.
Figure 12. Current flow and voltage drop during fast decay
For a rough calculation of the power dissipation, three different phases are selected:
1.
Static ON
2.
Static free wheeling (FW), fast decay
3.
Dynamic on and off with slew rate.
7.1
Static ON
Only the RDS,on of the high and low side switches are used for generating power
dissipation.
t
Vs
V
OUT-A
V
OUT-B
t
PWM
Vs
gnd
ON
ON
OFF
OFF
I
L
Vs
gnd
ON
I
L
OFF
ON
OFF
ON
FW fast decay
OUT-B
OUT-B
A
-
T
U
O
A
-
T
U
O
t
D
t
Pulse
t
r/f



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