BA6908F

Motor driver ICs

4/7

Electrical characteristics (Unless otherwise specified, Ta=25

Parameter

Symbol

Min.

Typ.

Max.

Unit

Conditions

Supply current

Charge current of capacitor for lock detection

Discharge current of capacitor for lock detection

Charge-discharge current ratio of capacitor for lock detection

Comparison voltage of capacitor for lock detection

Output voltage L

Output voltage H

Clamp voltage of capacitor for lock detection

ILDC

ILDD

VOL

VOH

rCD

VLDCL

VLDCP

1.5

1.50

4.2

320

500

680

−

1.14

0.47

0.3

−

3.4

2.75

8.7

4.50

0.24

0.48

0.90

5.7

9.5

1.80

−

3.9

0.76

2.47

0.2

4.1

1.06

mA

µA

−

V

V

V

"HO" terminal voltage L

"HO" terminal leak current

VHOL

IHOL

0.5

−

−

0.3

050

V

µA

µA

V

At output : OFF

VLD

=1.1V

VLD

=1.1V

VHO

=15V

rCD

=ILDC/ILDD

IHO

=5mA

Hall input offset voltage

Hall input-output gain

Hofs

GHO

10

−10

−

mV

=200mA

=200mA

This product is not designed for protection against radioactive rays.

Lock detect circuit, automatic restart circuit

Charge and discharge time at motor lock condition varies with the value of external capacitor at LD terminal and is

given by the following equation.

Ton (Charge time)

=

ILDC

C· (VLDCL-VLDCP)

Toff (Discharge time)

=

ILDD

C· (VLDCL-VLDCP)

C

VLDCL

VLDCP

ILDC

ILDD

:

:

:

:

:

(1.80V

Typ.)

(0.76V

Typ.)

(2.75

µA Typ.)

(0.48

µA Typ.)

The following value shows charge time and discharge time at C

=0.47µF for reference.

Charge time

= 0.18SEC

(Output : ON)

Discharge time

= 1.02SEC

(Output : OFF)

Value of capacitor at LD terminal

Clamp voltage of capacitor lock detection

Comparison voltage of capacitor lock detection

Charge current of capacitor lock detection

Discharge current of capacitor lock detection

Toff

Output Tr OFF

VLDCL

Motor lock

Detect lock

Lock cancel

Depend on the hall output

Reset ordinary motion

H

+

OUT1

LD

HO

VLDCP

ON

Ton

Fig.4 Timing chart