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AN2650 Datasheet(PDF) 14 Page - STMicroelectronics

Part # AN2650
Description  L9942 stepper motor driver for bipolar stepper motors
PDF  26 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2650 Datasheet(HTML) 14 Page - STMicroelectronics

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Decay modes
AN2650
14/26
DocID14109 Rev 3
Figure 6. Slow decay
4.2
Fast Decay
The fast decay mode realizes a maximum loss of energy in the motor coil. This means the
current decrease in the motor coil is “fast”.
Fast decay is illustrated in Figure 7.
Vs
gnd
ON
ON
OFF
OFF
I
L
Vs
gnd
OFF
I
L
Vs
gnd
ON
OFF
OFF
OFF
I
L
OFF
ON
OFF
t
I
L
t
CC
cross current
protection
slow
decay
„ON“
I
L increase



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