SPMD250STP STMicroelectronics, SPMD250STP Datasheet - Page 18

• Manufacturer Part Number: SPMD250STP
• Description: MOD STEPPER MOTOR DRV 2.5A BIPO
• Manufacturer: STMicroelectronics
• Series: EASY POWER™r
• Type: Stepper Motor Driverr

Specifications of SPMD250STP

• Motor Type: Stepper, Bipolar
• Number Of Motors: 1
• Voltage - Output: 40V
• Voltage - Logic Supply: 4.5 V ~ 5.5 V
• Current - Output: 2.5A
• Transistor Type: MOSFET
• Termination Style: PC Pin
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 12V
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 40V
• Product: Stepper Motor Controllers / Drivers
• Operating Supply Voltage: 5 V
• Mounting Style: SMD/SMT
• For Use With: 497-10050 - BOARD EVAL SPMD250497-9011 - DEMO SYSTEM BASED ON SPMD250STP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8416

User notes
9.9
18/28
Figure 14. Phase current programming
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
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
9
SPMD250STP
Rf
=
12
1
Cf
-------------- -
fc 17
306
–
=
80.5 4.7fc
------------------------------ -
=
Doc ID 14350 Rev 2
kΩ
–
fc
where
=
nF
where
fc
=
kHz
Figure
fc
=
Rf 18kΩ
kHz
15). The resistor value is
≥
9
SPMD250STP
SPMD250STP
12
1