Technical Note

6/10

BA6219BFP-Y, BA6222

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2009.04 - Rev.A

○

c

2009 ROHM Co., Ltd. All rights reserved.

2) Output high voltage setting

This function optionally sets output voltage by the output high voltage setting pin and controls the motor rotating speed.

However, when the output high voltage is set to a low level, consumption at IC increases. Carry out thermal design with

sufficient margin incorporated with the power dissipation (Pd) under the actual application condition taken into account.

a) BA6219BFP-Y

The circuit diagram associated with the output high voltage setting VR pin is as

expressed by:

b) BA6222

As the relationship between the output high voltage setting pin VR

with output current and chip temperature.

The VR voltage region can be classified into three categories in accord

with the output state:

(A) Output high voltage 0V offset region

(B) Fourfold gain region

(C) Output voltage saturated region

Using this function with the VR pin connected to a load which has output impedance of several hundreds ohm may

result in oscillation. In such event, connect a capacitor of 3300pF or higher to about 0.1μF across VR and GND and

make sure that the motor is free of oscillation.

c) Power supply voltage range of VR voltage

When output voltage control pin (VR) is used:

The output voltage control function does not operate in the region

outside this range. In addition, when the VR pin is not used, use by

shorting VR to VCC1.

3) Switching of rotating direction (FWD/REV)

When the rotating direction is changed over by the motor rotating condition, switch the direction after the motor is

temporarily brought to the BRAKE condition or OPEN condition. It is recommended to keep the relevant conditions as

follows:

via BRAKE: Longer than braking time*.

(* the time required for the output L terminal to achieve potential below GND when brake is activated.)

via OPEN: The time longer than 1 ms is recommended.

OUT

VCC2

VR

VCC1

Q1

Q2

Q3

Q4

Q5

Q6

Q7

Fig. 17

VOH

VR

BA6219BFP-Y

BA6222

(A)

(B)

(C)

Fig. 18

VOH

VR

Control range

Saturation range

Fig. 19