BA6901F Просмотр технического описания (PDF) - ROHM Semiconductor

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BA6901F

Two-phase Full-wave DC Brushless Fan Motor Drivers

ROHM Semiconductor 

BA6901F

Datasheet

●Safety measure

1) Reverse connection protection diode

Reverse connection of power results in IC destruction as shown in Fig 21. When reverse connection is possible,

reverse connection protection diode must be added between power supply and Vcc.

In normal energization

Vcc

Circuit

block

Each

pin

GND

Internal circuit impedance high

Æ amperage small

Reverse power connection

Vcc

Circuit

block

Each

pin

GND

Large current flows

Æ Thermal destruction

After reverse connection

destruction prevention

Vcc

Circuit

block

Each

pin

GND

No destruction

Fig.21 Current flow when power is connected reversely

2) About measures of voltage rise by back electromotive force

The voltage of output terminal rises by back electromotive force. The diode D1 of Fig.22 is necessary to divide a power

supply line of motor with small signal line, so that the voltage of the output does not affect a power supply line.

D1

IC

Fig.22 Separation of a power supply line

3) FG/AL output

Vcc

FG /AL

Pull-up

resistor

Protection

resistor R1

Connector

of board

Fig.23 Protection of FG and AL terminal

FG and AL output is an open collector and requires pull-up resistor.

The IC can be protected by adding resistor R1. An excess of absolute maximum rating, when FG or AL output terminal

is directly connected to power supply, could damage the IC.

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

TSZ22111・15・001

14/17

TSZ02201-0H1H0B100500-1-2

18.DEC.2012 Rev.002

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