M54679SP 데이터 시트보기 (PDF) - Renesas Electronics

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M54679SP

2-Phase Stepper Motor Driver

Renesas Electronics 

M54679SP

(10) Setting output current.

As the output circuit of M54679SP is designed by the bipolar type NPN transistors, the current that go through the

motor coil is smaller about 15 mA (typical) than the current that go through the current sensing resistor. This is caused

by the base current of the power transistors.

Therefore, be aware this base current when the output current is set.

VM

ON

MA

OFF

Iout

OFF

VCC

MB

ON

Ib=15mA(Typ.)

RS

Iout =IRS - Ib

(11) Power GND terminal.

Power GND is connected the anodes of flywheel diodes of bottom side. When the output H-bridge power stage goes to

ON, as the flyback current go through this GND terminal, minimize the wire resistor of this GND on the board.

Rev.1.0, Sep.17.2003, page 7 of 11

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