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ML4425IP датащи(PDF) 8 Page - Micro Linear Corporation

номер детали ML4425IP
подробное описание детали  Sensorless BLDC Motor Controller
PDF  16 Pages
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производитель  MICRO-LINEAR [Micro Linear Corporation]
домашняя страница  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4425IP датащи(HTML) 8 Page - Micro Linear Corporation

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ML4425
OUTPUTS
INPUT
STATE
LA
LB
LC
HA
HB
HC
SAMPLING
R
OFF
ON
OFF
ON
OFF
ON
N/A
A
OFF
OFF
ON
ON
OFF
OFF
FB B
B
OFF
OFF
ON
OFF
ON
OFF
FB A
C
ON
OFF
OFF
OFF
ON
OFF
FB C
D
ON
OFF
OFF
OFF
OFF
ON
FB B
E
OFF
ON
OFF
OFF
OFF
ON
FB A
F
OFF
ON
OFF
ON
OFF
OFF
FB C
Table 1. Commutation State Functions
Figure 4. Output Commutation Sequence Timing Diagram
Cycle 1 - Full Commutation, Cycle 2 - Commutation with 50% PWM Duty Cycle
HIGH
SIDE
DRIVE
OUTPUTS
HA
HB
HC
LOW
SIDE
DRIVE
OUTPUTS
LA
ABC
DE
F
ABC
DE
F
LB
LC
Voltage Controlled Oscillator (VCO)
The VCO provides a TTL compatible clock output on the
VCO/TACH pin proportional to the VCO input voltage at
the SPEED FB pin. The proportion of frequency to voltage
(VCO constant, Kv) is set by an 80.6kW resistor on RVCO
and a capacitor on CVCO as shown in Figure 5. RVCO sets
up a current proportional the VCO input voltage at SPEED
FB. This current is used to charge and discharge CVCO
between the threshold voltages of 2.3V and 4.3V. The
resulting triangle wave on CVCO corresponds to the clock
on VCO. Kv should be set so that the VCO output
frequency corresponds to the maximum commutation
frequency or maximum motor speed when the VCO input
is equal to or slightly less than VREF. CVCO is calculated
using the following equation:
C
V
Hz Farad
V
Hz
RPM
NSPEED
VCO
MAX
=
™™
œ
™™
-
6 5
3101 10
005
6
..
.
(2)
The closest standard value that is equal to or less than the
calculated CVCO should be used.
FUNCTIONAL DESCRIPTION (Continued)



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