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SPMD250STP Fiches technique(PDF) 19 Page - STMicroelectronics

No de pièce SPMD250STP
Description  2.5 A bipolar stepper motor drive module
PDF  29 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

SPMD250STP Fiches technique(HTML) 19 Page - STMicroelectronics

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SPMD250STP
User notes
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Figure 14.
Phase current programming
9.9
Chopper frequency programming
The chopper frequency is internally set to 17 kHz, and it can be changed by addition of
external components as follows. To increase the chopper frequency a resistor must be
connected between Oscillator (pin 8) and Vss (pin 12, see Figure 15). The resistor value is
calculated according to the formula:
Equation 3
To decrease the chopper frequency a capacitor must be connected between Oscillator (pin
8) and Gnd1 (pin 1). The capacitor value is calculated according to the formula:
Equation 4
12
9
1
12
9
1
SPMD250STP
SPMD250STP
Rf
306
fc 17
–
---------------
k
Ω
=
=
where
fc
kHz
=
Rf
18k
Ω
≥
Cf
80.5
4.7fc
–
fc
-------------------------------
nF
=
=
where
fc
kHz
=



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