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IM2000S Ver la hoja de datos (PDF) - Unspecified

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IM2000S Datasheet PDF : 16 Pages
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The IM2000S will automatically change the non-recirculating pulse widths
to compensate for changes in supply voltage and accommodate a wide
variety of motor inductances. This method also allows for the use of very
low inductance motors, while utilizing a 20kHz chopping rate which
reduces motor heating but maintains high efficiency and low current
ripple.
Fixed PWM Type
The internal PWM in the IM2000S may also be placed in a fixed
recirculating or non-recirculating mode by the use of the CIR0 and
CIR1 inputs. The relationship between the states of the CIR0 and
CIR1 inputs and the method of current control is shown in Table 3.3.
DRIVE CURRENT
FAST DECAY
Figure 3.4: Non-Recirculating PWM
CIR1
0
1
0
1
PWM Current Control Modes
CIR0
PWM Type
0
Auto-Recirculating
0
Fast Decay (Non-Recirculating)
1
Slow Decay (Recirculating)
1
Fast Decay (Non-Recirculating)
Table 3.3: Current Control Mode Settings
Power Control Outputs
The relationship between the
Sine\Cosine, Power Section
Control and PWM outputs of
the IM2000S is illustrated in
Figure 3.5. When either the sine
or cosine is at 0, the enable and
all drive control outputs for that
particular phase will be turned
off to improve accuracy.
The inputs IHI and ILOW to the
IM2000S are used to invert the
polarity of the high side and low
side driver control signals
respectively. These inputs have
no effect on the sign, EN, and
PWM output signals.
Sine\Cosine Output
Sense Current
Oscillator
Enable (In & Out)
HLx
LLx
HRx
LRx
SIGNx
PWMx
**
**
*Fast decay period for auto decay mode.
Figure 3.5: Power Control Output Relationships
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