Semiconductor Group

8

TCA 505 BG

Pin 14; B

This pin serves for limiting the base voltage of the internal output-stage transistors. If this pin

external resistor) that is independent of the supply voltage by means of an external resistor

across Q2 (or Q4) and ground (watch out for power dissipation!).

A capacitor on this pin delays the activation of the outputs after the supply voltage is applied

(turn-ON delay). In this way erroneous pulses are prevented on the output during buildup of

the oscillator.

for large core diameters, because in such cases a relativity long turn-ON delay has to be

selected and the delayed twin-on operation would otherwise be activated each time there was

a brief voltage dip.

The sample / pause ratio is approx. 1:200 (see pin SC).

switch) can be generated by switching the outputs. The quiescent current can then be kept low.

This mode is primarily suitable for AC switches with power supply by phase-control.