Rainbow-electronics BA6285FP Manual de usuario descargar pdf (Pagina 6)

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Motor driver ICs BA6285FS / BA6285FP

Circuit operation

(1) Input section

The four output modes are controlled by two logic inputs.

Current flows from OUT1 to OUT2 when F

IN is HIGH and

IN is LOW, and from OUT2 to OUT1 when RIN is HIGH

and F

IN is LOW (refer to the truth table). The input circuit

can be operated by a logic circuit with a current capacity

of 120  170µA.

(2) Output section

Current flows from OUT1 to OUT2 during forward rota-

tion, and from OUT2 to OUT1 during reverse rotation.

The output voltages V

OH and VOL are given by :

OH [V]=VREF – VCE (sat) (PNP) – VBE (NPN)

OL [V]=VCE (sat) (NPN)

CE and VBE are functions of the output current (see elec-

trical characteristic curves). The output current can be

set with the V

REF pin.

(3) Power saving circuit

All circuits are turned OFF when the F

IN and RIN input pins

are both LOW or the POWER SAVE pin is HIGH. This cir-

cuit saves power during standby mode by leaving the

outputs OPEN.

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Rainbow-electronics BA6285FP Manual de usuario Pagina 6