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L6223 датащи(PDF) 16 Page - STMicroelectronics

номер детали L6223
подробное описание детали  DMOS PROGRAMMABLE HIGH SPEED UNIPOLAR STEPPER MOTOR DRIVER
PDF  33 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6223 датащи(HTML) 16 Page - STMicroelectronics

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Figure 19: Dot Matrix Printer Motor Driver schematic diagram (See also fig. 10, 16).
External RC Network (pin 14)
The external RC network provides the higher of
the two possible chopping frequencies. The dis-
charge time of the capacitor represents the mini-
mum t(ON) available in closed loop. In open loop it
is possible to select a smaller t(ON), (see Fig. 20).
The t(ON) min defines the min current the IC can
supply to the motor, as well as the protection
”window”. This window is necessary to mask the
spike generated at the beginning of each chop-
ping period (see Fig. 21a).
Figure 20: Oscillator waveform and timing.
The window must be large enough to mask this
spike, without penalizing excessively the min cur-
rent control. The capacitor C mainly defines the
value of the window. The mathematical formulas
to calculate the approximate values are:
f(osc) = 1/(0.84
• RC)
for R > 10k
Ω
tON(min) =t(window) = 0.84
• C • R • Rin/(R+Rin)
for Rin = 1.2k
Ω
where Rin is the resistor internal to the IC for the
capacitor discharging.
L6223
16/33



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