Semiconductor Group

7

TCA 305

TCA 355

Resonant circuit

Hysteresis adjustment

Distance adjustment

D

Temperature compensation of the resonant circuit; possibly with series

resistance for the purpose of adjustment. The diode is not absolutely necessary.

Whether it is used or not depends on the temperature coefficient of the resonant

circuit.

Integration element. At pin 3 (integrating capacitance) we recommend a

capacitor of typ. 1 nF. To increase noise immunity this capacitor can be

Delay capacitor

Dimensioning Examples in Accordance with CENELEC Standard (flush)

Ω

M 12

M 18

M 30

Ferrite pot core

Number of turns

Cross section of wire

Sn

M 33 (7.35

100

0.1 CuL

206

1000 pF

appr. 350 kHz

4 mm

8.2 k

+ 330

100 nF

Ω

Ω

N 22 (14.4

80

20

268

1.2 nF

appr. 280 kHz

8 mm

33 k

100 nF

Ω

N 22 (25

100

10

585

3.3 nF

appr. 115 kHz

15 mm

22 k

+ 2.7 k

100 nF

Ω

Ω