Technical Note

11/15

BA6246, BA6246N, BA6247FP-Y, BA6239A, BA6238A, BA6238AN

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2009.04 - Rev.A

○

c

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2) Output high voltage setting

This function optionally sets output voltage by the VR 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. Please do not to

exceed the VCC1 and VCC2 voltage forced to the VR pin voltage.

a) BA6246, BA6246N, BA6247FP-Y

The circuit diagram associated with the output high voltage setting VR pin is as per shown on the right.

In addition, the relation of VREF voltage to output voltage

is expressed by:

Therefore, when the VR voltage condition is as follows, the output high voltage is restricted.

b) BA6239A

The circuit diagram associated with the output high voltage setting VR pin is as per shown on the right.

In addition, the relation of VREF voltage to output voltage

is expressed by:

Therefore, when the VR voltage condition is as follows,

the output high voltage is restricted.

VR

VCC2

Q1

Q2

OUT

GND

Q4

Q3

Fig.36 BA6239A

VCC2

VCC1

VR

Q1

Q2

Q3

Q4

Q5

OUT

GND

Q6

Q7

Fig.35 BA6246, BA6246N, BA6247FP-Y