ML4435 查看數據表（PDF） - Micro Linear Corporation

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ML4435

Sensorless BLDC Motor Controller

Micro Linear Corporation 

BLOCK DIAGRAM

PRELIMINARY

ML4435

FB A

14

FB B

15

FB C 16

5.8kΩ

2.9kΩ

NEUTRAL

SIMULATOR

MUX

SIGN

+

CHANGER –

BACK

EMF SAMPLER

+ LEVEL

SHIFT

– 0.7V

0.97V

+

COMP

–

COMMUTATION

STATE MACHINE

R

SPEED FB

6

VOLTAGE

CONTROLLED

OSCILLATOR

3µs

A

POWER ON

F

B

RESET PULSE

SPEED SET 5

E

C

D

–+

SPEED

ERROR AMP

+

–

COAST

+

COMP

1.5V –

SPEED COMP 3

ISENSE 1

SOFT START 19

8.2 + 0.7V

LEVEL SHIFT

0.7V

2.2 + 0.7V TRIANGLE WAVE

GENERATOR

1V

225kΩ

225kΩ

+

COMP

–

CURRENT LIMIT

COMPARATOR

PWM

COMPARATOR

+

–

5V

GATING

LOGIC

AND

OUTPUT

DRIVERS

DQ

R

PULSE-BY-PULSE

CURRENT LIMIT

8.7V +

– UVLO COMPARATOR

VREF + 0.7V

6V REFERENCE

0.9V

VREF

18 SPEED FB

2 TACH

20 CVCO

4 RVCO

7 HA

8 HB

9 HC

11 LA

12 LB

13 LC

6

RT

10

VCC

17

GND

ML4435 Block Diagram

May, 2000 PRELIMINARY DATASHEET

3

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