LA72648M-MPB-E データシートの表示（PDF） - ON Semiconductor

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LA72648M-MPB-E

Fan Motor Driver BTL Driver Single-Phase Full-Wave

ON Semiconductor 

Application Circuit Example

LA6581MC

Di

Cr

*1

VCC

R2

*2

H

*5

R2

FG

HB

LA6581MC

OUT1

IN+

OUT2

GND

*4

HB

*3

H

IN+

R1

Elements in substrate

*1 : When Di to prevent breakdown in case of reverse connection is used, it is necessary to insert a capacitor Cr to

secure the regenerative current route. Similarly, Cr is necessary to enhance the reliability when there is no

capacitor near the fan power line.

*2 : To obtain Hall bias from VCC, carry out 1/2 × VCC bias as shown in the figure. Linear driving is made through

voltage control of the coil by amplifying the Hall output. When the Hall element output is large, the startup

performance and efficiency are improved. Adjustment of the Hall element can reduce the noise further.

*3 : When the Hall bias is taken from the HB pin, constant-voltage bias is made with about 2.0V. Therefore, the Hall

element can provide the output satisfactory in temperature characteristics. Adjustment of the Hall output

amplitude is made with R1. (When VCC = 12V, the step *2 above proves advantageous for IC heat generation.)

*4 : Keep this open when not used.

*5 : When the wiring from the Hall output to IC Hall input is long, noise may be carried through the wiring.

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No.A2028-4/4

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