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L6238S датащи(PDF) 21 Page - STMicroelectronics

номер детали L6238S
подробное описание детали  12V SENSORLESS SPINDLE MOTOR CONTROLLER
PDF  31 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6238S датащи(HTML) 21 Page - STMicroelectronics

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sistive network as shown in figure 4.12 can be
used to emulate the Bemf of the motor.
The actual Bemf zero-crossing is 30 electrical de-
grees (50% of a commutation interval) away from
the optimal switch point. A digital counter circuit
measures 50% of the previous interval to deter-
mine the next interval’s commutation delay from
the zero crossing. During the low RPM stages of
start up the long commutation intervals may
cause the counter to overflow, in which case 50%
of the max count will be less than 50% of the
ideal commutation interval. Therefore, the torque
will not be optimal until the desired commutation
interval is less than the dynamic range of the
counter.
4.9 Center Tap Protection
Spindle Motors with a high number of windings
exhibit a transformer coupling effect that in some
cases can cause relatively high currents to flow
through the center tap input.
Current flowing out of the center tap pin as high
as 25mA has been observed with certain motors.
Figure 4-12: Bemf Emulator
R1 1K
DS1
TO CENTER
TAP INPUT
D95IN317
Figure 4-13
Figure 4-11: Bemf Amplifier.
Vo
BEMF
-35
-25
0
25
35
ViBEMF(mV)
SLOPE=0
SLOPE=1
D95IN316
L6238S
21/31



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