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

Figure 6. Recommended Application Diagram for Positive Control

P OWE R

Reverse Battery

Protection Diode

EMI

Protection

Networ k

1KΩ

1KΩ

U709

V CC

V FB

1nF

V COM

1nF

-+

+-

OSCILLATOR

M+

100nF

DC

MOTOR

M

M-

GROUND

ROSC COSC GND

R osc

27KΩ

Co sc

10nF

Figure 7. Recommended Application Diagram for Direction Control

100nF 1nF

POWER

Reverse Battery

Protection Diode

DIR

Th reshold

Voltage

20KΩ

10KΩ

DIR

Protection

Resistor

EMI

Protection

Cap acitors

1nF

VFB

U709

-

VCC

+

VCOM

1nF

+-

M+

100 nF

DC

MOTOR

M

M-

20KΩ

OSCILL ATOR

100 nF

1nF

GROUND

ROSC COSC GND

Ro sc

27KΩ

Co sc

10nF

Over Current Protection.

The driver output pins (M+ and M-) are over cur-

rent protected by 4 separate linear current limit-

ers, one for each of the 4 power output transis-

tors. The output drivers resume normal operation

as soon as the over current is removed.

Motor Over Voltage Protection.

The motor is over voltage protected by switching

off (to Hi-Z) the M+ and M- output drivers, when

Vcc rises above the 19V typ. over voltage shut

down threshold.

6/9

Over Temperature Protection.

The chip is over temperature protected by switch-

ing off (to Hi-Z) the M+ and M- output drivers.

Power Supply Transient Protections.

The device provides over voltage suppression for

fast Vcc voltage transients (Fig. 5). The Vcc is

clamped at typ. 70V by turning on all four, bridge

connected, power output transistors. They are

roughly subjected to equal currents and voltages

for even transient energy distribution.

The over voltage suppression is deactivated for

slow Vcc voltage transients (Fig. 4) by raising the

Vcc voltage clamp at typ. 80V.

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