TC78B002FTG データシートの表示（PDF） - Toshiba

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TC78B002FTG

TOSHIBA CMOS Integrated Circuit Silicon Monolithic

Toshiba 

TC78B002FTG

10. Lock protection

It monitors the motor rotation by the hall signal and operates when the zero cross of the hall signal can not be

detected for certain time (TON) or more. When lock protection operates, the upper output transistor is turned off

for 1ms(typ) and then all output power transistors are turned off. The motor drive resumes certain time (TOFF)

after the lock protection operates.

TON = 0.4s (typ)

TOFF = 4s (typ)

1ms

1ms

FG is outputted by the hall signal even while the lock protection is operating.

In case the zero cross of the hall signal is detected twice in re-startup, the lock protection is cleared and the

RDO signal outputs low again.

11. Quick Start

During TOFF of lock protection, lock protection is cleared when the voltage of VSP pin is set to VAD(L) or less.

When VAD(L) or more is applied to the VSP pin again, the motor restarts operating quickly without waiting for

the end of the TOFF term.

1ms

0.55V

Because the voltage of VSP pin is detected through A/D circuit, the voltage of VSP pin should be kept at VAD(L)

or less for VSP response time (TVSP) or more in order to clear the lock protection.

Quick start is disabled when the minimum of the duty is configured by applying the voltage of VAD(L) or more

to VMI pin.

21

2013-03-19

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