Typical applications of TDA1085

It generates AC bipolar signals, longitude. Received
pin 12. The positive half cycle of the speed measurement frequency causes the pump capacitor C to be charged on pin 11. Charging,
under the action of the internal F/V conversion circuit, the resistor R on pin 4. . The current flowing
is proportional to the motor speed. By R,. and ('. Adjust the characteristics of the F/V converter. There is a 470kn resistor in series between pin 11 and pin 9
, which helps to reduce the effect of temperature. The voltage
    of pin 12 is monitored by the internal monitor. If the voltage is higher than 5v. The chip stops working. For example, when the speed measuring generator is open circuit, the voltage at pin 12 will rise, causing the trigger pulse to stop, preventing the motor from running out of control and overspeeding. There is a diode   in pin 12 of TDA1085C , which has a negative direction for the negative half cycle of the speed measuring signal . Clamping function. There is no such clamping diode in TD A10 85A, so a diode VD should be added to the direct circuit.     If a DC tachometer generator is used, it should be directly connected to pin 4 without using the internal F/V converter. Just connect pin 12 to ground.