TA8490(2001) Просмотр технического описания (PDF) - Toshiba

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производитель

TA8490
(Rev.:2001)

TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT MULTI−CHIP

Toshiba 

TA8490F

Reverse rotation detection circuit

By comparing the two phases of the Hall element signal, this circuit detects a state where the phases are

inverted, at which time the torque is reduced to 0. The detection accuracy is determined by the number of pulses

per rotation of Hall element output.

Note: Due to its inertial force, the motor does not stop immediately after the torque is reduced to 0.

Output circuit

This circuit uses the power transistor’s base current to regulate the circuit’s output current.

The upper−stage power transistor consists of a PNP discrete transistor (RN6006), which gives high torque

efficiency.

Current limiter circuit

The current limit value is determined by the equation below.

ILIM ≈

0.24

RF + 0.1

[A]

(typ.)

12

2001-06-13

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