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INFO

available

UCC2626

UCC3626

PRELIMINARY

Brushless DC Motor Controller

FEATURES

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Two Quadrant and Four Quadrant

Operation

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Integrated Absolute Value Current

Amplifier

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Pulse-by-Pulse and Average Current

Sensing

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Accurate, Variable Duty Cycle

Tachometer Output

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Trimmed Precision Reference

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Precision Oscillator

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Direction Output

DESCRIPTION

The UCC3626 motor controller IC combines many of the functions re-

quired to design a high performance, two or four quadrant, 3-phase,

brushless DC motor controller into one package. Rotor position inputs

are decoded to provide six outputs that control an external power stage.

A precision triangle oscillator and latched comparator provide PWM mo-

tor control in either voltage or current mode configurations. The oscilla-

tor is easily synchronized to an external master clock source via the

SYNCH input. Additionally, a QUAD select input configures the chip to

modulate either the low side switches only, or both upper and lower

switches, allowing the user to minimize switching losses in less de-

manding two quadrant applications.

The chip includes a differential current sense amplifier and absolute

value circuit which provide an accurate reconstruction of motor current,

useful for pulse by pulse over current protection as well as closing a

current control loop. A precision tachometer is also provided for imple-

menting closed loop speed control. The TACH_OUT signal is a variable

duty cycle, frequency output which can be used directly for digital con-

trol or filtered to provide an analog feedback signal. Other features in-

clude COAST, BRAKE, and DIR_IN commands along with a direction

output, DIR_OUT.

BLOCK DIAGRAM

QUAD

20

28

VDD

BRAKE

19

1.75V

5 VOLT

REFERENCE

2

VREF

COAST

18

27

DIR_IN

21

DIRECTION

SELECT

HALLA

15

25

AHI

BHI

HALLB

16

HALL

DECODER

23

CHI

HALLC

17

DIRECTION

DETECTOR

26

ALOW

DIR_OUT

8

EDGE

DETECTOR

PWM COMPARATOR

24

BLOW

PWM_NI

14

PWM_I

13

OSCILLATOR

R鈥

22

CLOW

SYNCH

7

S

R

Q

3

CT

6

OVER-CURRENT

COMPARATOR

S

R

Q

ONE SHOT

TACH_OUT

OC_REF

12

5

4

C_TACH

R_TACH

IOUT

11

SENSE AMPLIFIER

PWM LOGIC

1

GND

SNS_NI

9

SNS_I

10

X5

UDG-97173

04/99

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