L6258 STMicroelectronics, L6258 Datasheet - Page 22
L6258
Manufacturer Part Number
L6258
Description
Manufacturer
STMicroelectronics
Datasheet
1.L6258.pdf
(32 pages)
Specifications of L6258
Operating Current
15mA
Motor Controller Type
PWM Motor Controller
Package Type
PowerSO
Operating Supply Voltage (min)
12V
Operating Supply Voltage (typ)
34V
Operating Supply Voltage (max)
5.25V
Lead Free Status / Rohs Status
Not Compliant
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PWM current control loop
3.5
22/32
Figure 9.
We can see that the effect of the load pole is cancelled by the zero of the Bx block ; the total
Aloop cross a the 0dB axis with a slope of -20dB/decade, having in this way a stable system
with an high gain at low frequency and a bandwidth of around 8KHz.
To increase the bandwidth of the system, we should increase the gain of the Bx block,
keeping the zero in the same position. In this way the result is a shift of the total Aloop
transfer function up to a greater value.
Effect of the Bemf of the current control loop stability
In order to evaluate what is the effect of the Bemf voltage of the stepper motor we have to
look at the load block:
Aloop bode plot (compensated)
L6258