ADM00308 Microchip Technology, ADM00308 Datasheet - Page 14

• Manufacturer Part Number: ADM00308
• Description: Power Management IC Development Tools MTS2916A Stepper Driver Eval Board
• Manufacturer: Microchip Technology
• Type: Motor / Motion Controllers & Driversr

Specifications of ADM00308

• Rohs: yes
• Product: Evaluation Boards
• Tool Is For Evaluation Of: MTS2916A
• Input Voltage: 7 VDC to 12 VDC

MTS2916A Dual Full-Bridge Stepper Motor Driver Evaluation Board User’s Guide
2.5
2.6
DS52058A-page 14
KEY COMPONENTS
MODES
Some of the key components on the evaluation board may need to be adjusted,
depending on the characteristics of the utilized motor. The fixed Off Time (t
by the combination of R
t
The evaluation board is designed with t
The amount of time it takes for the winding current to reach the regulation point is
determined by multiple factors, such as motor voltage, inductance, resistance and the
set point threshold.
The set point threshold is determined by the states of I0/I1, V
resistance value. For details on set point thresholds and component values, see the
MTS2916A Data Sheet (DS22259).
Explaining the effects of the motor characteristics is beyond the scope of this user’s
guide; however, the t
while trying to maintain a switching frequency above the 20 kHz audible range.
There is a single pole filter in the sense feedback used to set a break frequency of
approximately 80 kHz. Depending on the application, this break frequency may need
to be adjusted. This may be apparent when designing to regulate at low currents.
The following plots were taken from a single winding of a bipolar stepper motor.
TABLE 2-2:
FIGURE 2-2:
OFF
CH1: Phase 1
CH2: I01
CH3: I11
CH4: Coil Current
= 1.1 x R
Full Step
t
x C
MODE 1 VALUES
t
.
Mode 1 Plot.
OFF
t
and Ct and is determined by the expression:
time of 24.2 µs was chosen to cover most motor applications
V
Speed = 0.43V
V
REF
LOAD
= 1.94V
= 24V
OFF
= 24.2 µs.
 2012 Microchip Technology Inc.
REF
and the sense
OFF
) is set