ML4428CS datasheet(1/16 Pages) MICRO-LINEAR

Part #	ML4428CS

Description	Sensorless Smart-Start??BLDC PWM Motor Controller

PDF	16 Pages

Scroll/Zoom	100%

Manufacturer	MICRO-LINEAR [Micro Linear Corporation]

Direct Link	http://www.microlinear.com

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1 / 16 page

April 1997

PRELIMINARY

ML4428*

Sensorless Smart-Start™ BLDC PWM Motor Controller

GENERAL DESCRIPTION

The ML4428 motor controller provides all of the functions

necessary for starting and controlling the speed of delta or

wye-wound Brushless DC (BLDC) Motors without the need

for Hall Effect sensors.

Back-EMF voltage is sensed from the motor windings to

determine the proper commutation phase sequence using

PLL techniques. The patented back-EMF sensing technique

used will commutate virtually any 3-phase BLDC motor that

has at least a 30% variation in inductance during rotation

and is insensitive to PWM noise and motor snubbing

circuitry.

The ML4428 also utilizes a patented start-up technique

which samples the rotor position and applies the proper

drive to accelerate the motor. This ensures no reverse

rotation at start-up and reduces total start-up time.

1

FEATURES

s

Stand-alone operation with forward and reverse

s

On-board start sequence: Sense Position

Æ Drive Æ

Accelerate

Æ Set Speed

s

No backward movement at start-up

s

Patented back-EMF commutation technique

s

Simple variable speed control with on-board reference

s

Single external resistor sets all critical currents

s

PWM control for maximum efficiency or linear control

for minimum noise

s

12V operation provides direct FET drive for 12V motors

s

Drives high voltage motors with high side FET drivers

s

Guaranteed no shoot-through when driving external

FET gates directly

* Some Packages Are End Of Life

BLOCK DIAGRAM/TYPICAL APPLICATION

18

13

22

23

24

2

3

4

10

11

9

9V POWER FAIL

BACK-EMF

SAMPLER

HIGH SIDE

GATE DRIVE

LOW SIDE

GATE DRIVE

VFLT

VCO

PHI1

PHI2

PHI3

P1

P2

P3

N1

N2

N3

28

GND

PWM CURRENT

CONTROL

AND ONE SHOT

1

ISNS

26

CIOS

START-UP

AND

COMMUTATION

LOGIC

17

CSNS

25

BRAKE

8

6V

REF

7

27

PWM

SPEED

CONTROL

VSPEED

VREF

RREF

CPWM

CSC

5

6

VCO

16

15

RVCO

CVCO

20

RCVCO

14

VCC

12

F/R

19

RINIT

CISC

21

+

–

0.6V

RUN

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ML4428CS Datasheet(PDF) 1 Page - Micro Linear Corporation

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