BA6286 데이터 시트보기 (PDF) - ROHM Semiconductor

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BA6286

Reversible motor driver

ROHM Semiconductor 

Motor driver ICs

FCircuit operation

(1) Input section

The four output modes are controlled by two logic inputs.

Current flows from OUT1 to OUT2 when FIN is HIGH and

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

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

can be operated by a logic circuit with a current capacity

of 120 X 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 VOH and VOL are given by :

VOH [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 VREF pin.

BA6286 / BA6286N

(3) Power saving circuit

All circuits are turned off when the FIN 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.

FInput / output truth table

FApplication example

435

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