539

Motor driver ICs

BA6477FS

(4)

Other circuits

S Start/stop circuit

The start / stop circuit puts the IC to the operating state

when the control pin is LOW, and to the standby state (cir-

cuit current is nearly zero) when the control pin is HIGH.

The Hall elements bias switch, which is linked to the

start / stop circuit, is turned off during the standby state,

so that the Hall device current is shut down.

S Thermal shutdown circuit

This circuit shuts down the IC currents when the chip

junction temperature is increased to about 175

_C (typi-

cal). The thermal shutdown circuit is deactivated when

the temperature drops to about 155

_C (typical).

FCircuit operation