Datasheet

8/10

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

www.rohm.com

11.Jul.2012 Rev.001

TSZ02201-0H1H0B100110-1-2

TSZ22111・15・001

BH6789FVM

3) Problem of GND line PWM switching

Do not perform PWM switching of GND line because the potential of GND terminal cannot be kept at the minimum.

Fig.15 GND Line PWM switching prohibited

4) AL output

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

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

directly connected to power supply, could damage the IC.

Fig.16 Protection of AL terminal

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●

●

●Thermal derating curve

Thermal derating curve indicates power that can be consumed by IC with reference to ambient temperature. Power that

can be consumed by IC begins to attenuate at certain ambient temperature. This gradient is determined by thermal

resistance θja.

Thermal resistance θja depends on chip size, power consumption, package ambient temperature, packaging condition,

wind velocity, etc., even when the same package is used. Thermal derating curve indicates a reference value measured

at a specified condition. Fig.17 shows a thermal derating curve (Value when mounting FR4 glass epoxy board 70 [mm] x

70 [mm] x 1.6 [mm] (copper foil area below 3 [%]))

＊

Reduce by 4.68 mW/°C over 25°C.

(70.0mm×70.0mm×1.6mm glass epoxy board)

Fig.17 Thermal derating curve

PWM input

Prohibited

Vcc

Motor

Driver

GND

Controller

M

Pd(mW)

700

600

585

500

400

300

200

100

0

25

50

75

105

100

125

150

Ta(℃)

AL

Protection

Resistor R1

Pull-up

resistor

Vcc

Connector

of board