Rainbow-electronics BA6286N Manual do Utilizador descarregar pdf (Página 4)

435

Motor driver ICs BA6286 / BA6286N

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)

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

VCE 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 put to LOW level. This circuit saves power dur-

ing standby mode by leaving the outputs OPEN.

(4) Thermal shutdown circuit

When the thermal shutdown circuit is activated at the

chip temperature of about 175C (typical), the outputs

are left OPEN. The temperature difference between the

activation and deactivation settings is about 15C. When

the thermal shutdown circuit is deactivated, the outputs

revert to the status determined by input mode.

Input / output truth table

Application example

1 2 3 4 5 6 7

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