AMIS30623C623BRG ON Semiconductor, AMIS30623C623BRG Datasheet - Page 31

• Manufacturer Part Number: AMIS30623C623BRG
• Description: IC MOTOR DRIVER/CTLR 32-QFP
• Manufacturer: ON Semiconductor

Specifications of AMIS30623C623BRG

• Applications: Stepper Motor Driver
• Number Of Outputs: 1
• Current - Output: 800mA
• Voltage - Supply: 6.5 V ~ 29 V
• Operating Temperature: -40°C ~ 165°C
• Mounting Type: Surface Mount
• Package / Case: 32-VSQFP
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Motordriver
Current Waveforms in the Coils
PWM Regulation
or <Ihold> and the current position of the rotor) through
the motor coil while ensuring high energy transfer
efficiency, a regulation based on PWM principle is used. The
regulation loop performs a comparison of the sensed output
current to an internal reference, and features a digital
regulation generating the PWM signal that drives the output
switches. The zoom over one micro−step in the Figure 18
above shows how the PWM circuit performs this regulation.
To reduce the current ripple, a higher PWM frequency is
selectable. The RAM register PWMfreq is used for this.
Figure 17 below illustrates the current fed to the motor coils by the motordriver in half−step mode.
Whereas Figure 18 below shows the current fed to the coils in 1/16
In order to force a given current (determined by <Irun>
Figure 18. Current Waveforms in Motor Coils X and Y in 1/16
Ix
Iy
Figure 17. Current Waveforms in Motor Coils X and Y in Halfstep Mode
Ix
Iy
Coil Y
Coil Y
Coil X
Coil X
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PWM Jitter
higher harmonics of the PWM frequency, jitter can be added
to the PWM clock. The RAM register <PWMJEn> is used
for this.
Table 22. PWM FREQUENCY SELECTION
Table 23. PWM JITTER SELECTION
To lower the power spectrum for the fundamental and
PWMfreq
PWMJEn
th
micro stepping (1 electrical period).
0
1
0
1
th
Single PWM frequency
Added jitter to PWM frequency
Micro−Step Mode
Applied PWM Frequency
22,8 kHz
45,6 kHz
Status
t
t