L9909 データシートの表示（PDF） - STMicroelectronics

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L9909

DC MOTOR DRIVER WITH POSITION CONTROL

STMicroelectronics 

®

L9909

DC MOTOR DRIVER WITH POSITION CONTROL

DESCRIPTION

Oscillator.

The output current at ROSC pin is mirrored to

COSC pin with a proper direction according to its

voltage slope.

The triangular wave form at COSC pin, being

compared with a threshold, defines the PWM duty

cycle at the motor driver output M+ and M-.

The oscillator also supplies the time base for the

switch off and switch on delays and the Time Out

Counter.

The typical oscillator period is:

Tosc = 7.04 x Rosc x Cosc

MInidip

ORDERING NUMBER: L9909

BLOCK DIAGRAM

V cc

Vcc

Current ratio = 1 : 2

1

2

Vcc

01

150KΩ

01

150KΩ

+-

- + OP1

| 5 Verr|

COMP7

Td_on

switch on

DELAY

+

VR7 =

7.5% Vcc

COUN TER

START

RES

TIME OUT

Vcc

+

COMP1

Td_off

switch off

VR3=6.6% Vcc

START

STOP

-

D ELAY

VR4 = 1.5V

+ COMP4 Td_pwm

pwm

DELAY

STOP

DIRECTION

PWM

VR2=56.6%Vcc

Tck

DRIVE R

VR3=6.6%Vcc

VR5 = 6.6% Vcc

TEMP.

SENSE

over

temp.

CONT ROL

OFF

Td_ov_2

( 1ms)

Vcc

VOLT.

over volt.

over volt.

SENSE

D ELAY2

OFF

Vcc

Td_ov_1

(130 µs)

35V

VR2 =

56.6% Vcc

VR3 =

6.6% Vcc

COMP2

S

Tck

FF

R

over volt.

DELAY 1

curr.

limit

curr.

limit

COMP3

Vcc

I

35V

M+

open

open

10V

Q

M-

16V VR2 =

I

56.6% Vcc

VR3 =

6.6% Vcc

OP8 VR8 =

+ 14.2% Vcc

I curr. -

Latch

sense

curr.

curr.

IN

limit

limit

7V

OSCILLATOR

ROSC

GND

February 2001

1/9

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