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BA6901F

Datasheet

Datasheet

TSZ02201-0H1H0B100500-1-2

© 2012 ROHM Co., Ltd. All rights reserved.

18.DEC.2012 Rev.002

TSZ22111・15・001

www.rohm.com

●Description of operations

1) Lock protection and automatic restart

○CR timer system

Charging and discharging time at LD terminal depends on the capacitor equipped externally on LD terminal. Charging

and discharging time is determined as follows:

C

： Capacity of capacitor equipped externally on LD terminal

ＶLDCL

： LD terminal clamping voltage

ＶLDCP ： LD terminal comparator voltage

ＩLDC

： LD terminal charging current

ＩLDD

： LD terminal discharging current

Timing chart of LD terminal is shown in Fig.13.

Fig.13 Lock protection (CR timer system) timing chart

2) PWM terminal

The signal input to PWM terminal is below L (0.8V or less), output (A1 and A2) turns off. And when it is above H (2.0V

or more), output turns on. PWM terminal is pulled up by resistor (30kΩ:typ.) inside IC. When it is open, the output is in

operating mode.

Fig.14 Timing chart in PWM control

TON(charging time) =

C×(VLDCL-VLDCP)

ILDC

TOFF(discharging time)=

C×(VLDCL-VLDCP)

ILDD

H-

Motor

locking

Lock

detection

Lock

release

A1

LD terminal clamping

voltage

AL

LD

Recovers normal

operation

Output Tr OFF

TON

HIGH(open collector)

TOFF

ON

FG

LD terminal comparator

voltage

PWM

H+

A1

A2

FG