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ML4425CP Datasheet(PDF) 8 Page - Fairchild Semiconductor

No. de pieza ML4425CP
Descripción Electrónicos  Sensorless BLDC Motor Controller
Download  16 Pages
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

ML4425CP Datasheet(HTML) 8 Page - Fairchild Semiconductor

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ML4425
PRODUCT SPECIFICATION
8
REV. 1.0.2 7/2/01
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 80.6kΩ 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 trian-
gle 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:
The closest standard value that is equal to or less than the
calculated CVCO should be used.
C
VCO
6.5V
3.101
×
10
6
Hz
Farad
V
------------------------------
×
0.05
Hz
RPM
--------------
N
×
SPEED
MAX
×
-----------------------------------------------------------------------------------
=
(2)
Table 1. Commutation State Functions
State
Outputs
Input
Sampling
LA
LB
LC
HA
HB
HC
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
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
A
B
C
D
EFA
B
C
D
E
F
LB
LC


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