Datenblatt-Suchmaschine für elektronische Bauteile
  German  ▼
ALLDATASHEETDE.COM

X  

ML4435 Datenblatt(PDF) 8 Page - Micro Linear Corporation

Teilenummer ML4435
Bauteilbeschribung  Sensorless BLDC Motor Controller
Download  14 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Hersteller  MICRO-LINEAR [Micro Linear Corporation]
Direct Link  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4435 Datenblatt(HTML) 8 Page - Micro Linear Corporation

Back Button ML4435 Datasheet HTML 4Page - Micro Linear Corporation ML4435 Datasheet HTML 5Page - Micro Linear Corporation ML4435 Datasheet HTML 6Page - Micro Linear Corporation ML4435 Datasheet HTML 7Page - Micro Linear Corporation ML4435 Datasheet HTML 8Page - Micro Linear Corporation ML4435 Datasheet HTML 9Page - Micro Linear Corporation ML4435 Datasheet HTML 10Page - Micro Linear Corporation ML4435 Datasheet HTML 11Page - Micro Linear Corporation ML4435 Datasheet HTML 12Page - Micro Linear Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 8 / 14 page
background image
PRELIMINARY DATASHEET
May, 2000
8
PRELIMINARY
ML4435
times the commutation frequency. The TACH out also
indicates a low motor speed by staying TTL high when the
motor is at its minimum speed (SPEED FB below 0.97V).
BACK EMF SAMPLER
The input to the VCO (pin 18) SPEED FB is controlled by
the Back EMF Sampler. The back EMF sense pins FB A,
FB B, and FB C inputs to the back EMF sampler require
a signal from the motor phase leads that is below the
VCC of the ML4435. The phase sense input impedance is
8.7k
Ω. If the motor voltage is greater than the VCC of the
ML4435 then this requires a series resistor RFB from the
motor phase lead shown in Figure 8. RFB can be selected
by using the graph in Figure 9 or using the following
equation:
VNEUTRAL = (FB A + FB B + FB C)/3
This allows the ML4435 to compare the back EMF signal
to the motors neutral point without the need for bringing
out an extra wire on a WYE wound motor. For DELTA
wound motors there isn’t a physical neutral to bring out so
this reference point must be calculated anyway.
The back EMF sampler takes the motor phase that is not
driven (i.e. if LA and
HB are on then phase A is driven
low and phase B is driven high then phase C is sampled).
The sampled phase provides a back EMF signal that is
compared against the neutral of the motor. The sampler
is controlled by the commutation state machine. The
sampled back EMF is compared to the neutral through an
error amplifier. The output of the error amplifier outputs
a charging or discharging current to SPEED FB (pin 18)
which provides the voltage to the VCO.
BACK EMF SENSING PHASE LOCKED LOOP
COMMUTATION CONTROL
The three blocks: The commutation state machine, the
VCO, and the back EMF sampler form a phase locked
loop that locks the commutation clock onto the back EMF
signal. The complete phase locked loop is illustrated in
Figure 10. The phased locked loop requires a lead lag
filter that is set by external components on SPEED FB (pin
18). The filter components in Figure 10 work for most
applications. If performance is unstable C1 and C2 can
go up or down a decade in value as low as the C2 stays
equal to C1 x 10.
Figure 10. Phase Locked Loop
FBA
VCO
BACK EMF
SAMPLER
COMMUTATION
STATE MACHINE
4
SPEED FB
RSFB
CSFB2
CSFB
6
5
FBB
FBC
RSFB2
Figure 9. RFB vs. VMOTOR [MAX]
FUNCTIONAL DESCRIPTION
RFB = 8.7k
(
VMOTOR
12
-1)
W
The back EMF sampler takes the motor phase voltages
divided down to signals that are less than VCC (12V
nominal) and calculates the neutral point of the motor by
the following equation:
Motor Volta e [Max] V
05
20
25
30
2,000
0
4,000
6,000
,000
0,000
2,000
Figure 8. Back EMF Sampler Configuration
BLDC
MOTOR
RFBA
RFBB
RFBC
FBA
ABC
4
FBB
5
FBC
6


Ähnliche Teilenummer - ML4435

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Mitsubishi Electric Sem...
ML4406 MITSUBISHI-ML4406 Datasheet
206Kb / 7P
   MITSUCISHI LASER DIODES
logo
Micro Linear Corporatio...
ML4411 MICRO-LINEAR-ML4411 Datasheet
296Kb / 14P
   Sensorless Spindle Motor Controller
ML4411ACS MICRO-LINEAR-ML4411ACS Datasheet
296Kb / 14P
   Sensorless Spindle Motor Controller
ML4411CS MICRO-LINEAR-ML4411CS Datasheet
296Kb / 14P
   Sensorless Spindle Motor Controller
logo
Mitsubishi Electric Sem...
ML44126N MITSUBISHI-ML44126N Datasheet
51Kb / 4P
   FOR OPTICAL INFORMATION SYSTEMS
More results

Ähnliche Beschreibung - ML4435

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Fairchild Semiconductor
ML4425 FAIRCHILD-ML4425 Datasheet
167Kb / 16P
   Sensorless BLDC Motor Controller
logo
Micro Linear Corporatio...
ML4425 MICRO-LINEAR-ML4425 Datasheet
353Kb / 16P
   Sensorless BLDC Motor Controller
ML4420 MICRO-LINEAR-ML4420 Datasheet
2Mb / 14P
   ENHANCED SENSORLESS BLDC MOTOR CONTROLLER
ML4426 MICRO-LINEAR-ML4426 Datasheet
353Kb / 16P
   Bi-directional Sensorless BLDC Motor Controller
logo
Allegro MicroSystems
A4962 ALLEGRO-A4962 Datasheet
671Kb / 42P
   Sensorless BLDC Controller
logo
Princeton Technology Co...
PT2434 PTC-PT2434 Datasheet
412Kb / 5P
   3-Phase Sensorless BLDC Motor Controller
logo
Allegro MicroSystems
A4963 ALLEGRO-A4963 Datasheet
642Kb / 42P
   Sensorless BLDC Controller
logo
Micro Linear Corporatio...
ML4428 MICRO-LINEAR-ML4428 Datasheet
310Kb / 16P
   Sensorless Smart-Start??BLDC PWM Motor Controller
logo
Allegro MicroSystems
A4960-A ALLEGRO-A4960-A Datasheet
1Mb / 34P
   Automotive, Sensorless BLDC Controller
A4964 ALLEGRO-A4964 Datasheet
1Mb / 92P
   Sensorless Sinusoidal Drive BLDC Controller
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14


Datenblatt Download

Go To PDF Page


Link URL




Privatsphäre und Datenschutz
ALLDATASHEETDE.COM
War ALLDATASHEET hilfreich?  [ DONATE ] 

Über Alldatasheet   |   Werbung   |   Kontakt   |   Privatsphäre und Datenschutz   |   Linktausch   |   Hersteller
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com