Datasheet

6/9

BH6766FVM

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

www.rohm.com

11.Jul.2012 Rev.001

TSZ02201-0H1H0B100100-1-2

TSZ22111・15・001

●

●

●

●Safety measure

1) Reverse connection protection diode

Reverse connection of power results in IC destruction as shown in Fig.10. When reverse connection is possible,

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

Fig.10 Flow of current when power is connected reversely

2) Measure against Vcc voltage rise by back electromotive force

Back electromotive force (Back EMF) generates regenerative current to power supply. However, when reverse

connection protection diode is connected, Vcc voltage rises because the diode prevents current flow to power supply.

Fig.11 Vcc voltage rise by back electromotive force

When the absolute maximum rated voltage may be exceeded due to voltage rise by back electromotive force, place

(A) Capacitor or (B) Zener diode between Vcc and GND. If necessary, add both (C)..

Fig.12 Measure against Vcc voltage rise

Vcc

GND

Vcc

GND

Vcc

GND

Internal circuit impedance high

amperage small

Circuit

block

Each

pin

In normal energization

Large current flows

Thermal destruction

Each

pin

Circuit

block

Reverse power connection

No destruction

Each

pin

Circuit

block

After reverse connection

destruction prevention

Phase

switching

ON

ON

ON

ON

(A) Capacitor

(B) Zener diode

(C) Capacitor and zener diode

ON

ON

ON

ON

ON

ON