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ML4426CS 数据表(PDF) 8 Page - Micro Linear Corporation

部件名 ML4426CS
功能描述  Bi-directional Sensorless BLDC Motor Controller
PDF  16 Pages
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制造商  MICRO-LINEAR [Micro Linear Corporation]
网页  http://www.microlinear.com
标志 MICRO-LINEAR - Micro Linear Corporation

ML4426CS 数据表(HTML) 8 Page - Micro Linear Corporation

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ML4426
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 (Forward Direction)
Figure 4. Output Commutation Sequence Timing Diagram (Forward Direction)
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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