BA6901F-E2 데이터 시트보기 (PDF) - ROHM Semiconductor

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BA6901F-E2

Two-phase Full-wave DC Brushless Fan Motor Drivers

ROHM Semiconductor 

BA6901F

Datasheet

●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:

TON(charging time) =

TOFF(discharging time)=

C×(VLDCL-VLDCP)

ILDC

C×(VLDCL-VLDCP)

ILDD

C

ＶLDCL

ＶLDCP

ＩLDC

ＩLDD

： Capacity of capacitor equipped externally on LD terminal

： LD terminal clamping voltage

： LD terminal comparator voltage

： LD terminal charging current

： LD terminal discharging current

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

H-

A1

LD terminal clamping

voltage

LD

LD terminal comparator

voltage

AL

TOFF

Output Tr OFF

TON

ON

HIGH(open collector)

FG

Motor Lock

locking detection

Lock Recovers normal

release operation

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.

H+

PWM

A1

A2

FG

Fig.14 Timing chart in PWM control

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

TSZ22111・15・001

9/17

TSZ02201-0H1H0B100500-1-2

18.DEC.2012 Rev.002

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