BA6871 データシートの表示（PDF） - ROHM Semiconductor

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BA6871

3-phase motor driver

ROHM Semiconductor 

Motor driver ICs

FOperation notes

The BA6871BS has two thermal shutdown circuits

(TSD1 and TSD2) to protect the IC. The typical shutdown

temperatures are 175_C for TSD1 and 215_C for TSD 2.

When the TSD1 is activated at an elevated chip tempera-

ture, the output pins (pins 1, 3, and 30) are set to the open

state. TSD1 is functional against excessive power dis-

sipation, output short-circuiting, and other irregularities in

the output current, but does not work against overheating

caused by high internal currents due to externally caused

IC damage or pin-to-pin short-circuiting.

When TSD2 is activated at a higher chip temperature, the

high- and low-side output transistors are turned on, and

the internal resistance between the motor power supply

FElectrical characteristic curves

BA6871BS

pin (pin 2) and the output ground pin (31 pin) drops to less

than 3Ω. The motor power supply current (IM) is then giv-

en by

VM [V]

IM = RM)R31P)3 [Ω]

where

IM is the motor supply current

VM is the motor supply voltage,

RM is the motor power supply output resistance,

R31P is the pin-31 resistance.

In your application, make sure to connect between the

motor power supply and pin 2 a circuit breaker that oper-

ates at currents less than IM.

682

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