TCA305 SIEMENS | Alldatasheet

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Technical content

Features

  • Lower open-loop current consumption;IS < 1 mA
  • Lower output saturation voltage
  • The temperature dependence of the switching distance is lower and compensation of the resonant circuit TC (temperature coefficient) is easier
  • The sensitivity is higher, so that larger switching distances are possible and coils of a lower quality can be used
  • The switching hysteresis remains constant as regards temperature, supply voltage and switching distance
  • The TCA 305 even functions without external integrating capacitor. With an external capacitor (or with RC combination) good noise immunity can be achieved
  • The outputs are temporarily short-circuit proof (approx. 10 s to 1 min depending on package)
  • The outputs are disabled whenVS < approx. 4.5 V and are enabled when the oscillator stabilizes (fromV S min = 5 V)
  • Higher switching frequencies can be obtained
  • Miniature package Proximity Switch P-DSO-8-1 P-DIP-14-1 P-DSO-14-1 Type Ordering Code TCA 305 A Q67000-A2291 Package P-DIP-14-1 TCA 305 G Q67000-A2305 P-DSO-14-1 (SMD) TCA 355 G Q67000-A2444 P-DSO-8-1 (SMD) ■ Not for new design 01.96

The devices TCA 305 and TCA 355 contain all the functions necessary to design inductive proximity switches. By approaching a standard metal plate to the coil, the resonant circuit is damped and the outputs are switched. Operation Schematic: see TCA 205 The types TCA 305 and TCA 355 have been developed from the type TCA 205 and are out- standing for the following characteristics: Logic Functions Oscillator Outputs Q not damped damped H L L H TCA 355 G Pin Configurations(top view)

Standard Turn-ON Delay Referred toTA = 25 ˚C

VS = 12 V,TA = – 25 to 85 ˚C Parameter Symbol Unit Limit Values Supply voltage Output voltage VS VQ Output current IQ mA50 V V Junction temperature Storage temperature range T j Tstg 150 – 55 to 125 Thermal resistance system - air TCA 305 A TCA 305 G R th SA Rth SA 85 (135)2) 140 (200)2) K/W K/W Distance, hysteresis resistance RDi,RHy Ω0 Capacitances C I,C D µF5 Supply voltage VS V5 to 303) Oscillator frequency fOSC MHz0.015 to 1.5 Ambient temperature TA ˚C– 25 to 85 Parameter typ.min. max. Unit Test Condition Limit ValuesSymbol Open-loop current consumption 0.6 0.9 (1.0)2) mA outputs openIS Reference voltage1) L-output voltage per output 3.2 0.04 0.10 0.22 0.15 0.35 0.75 V V V V I REF < 10µA IQ L = 5 mA IQ L = 25 mA IQ L = 50 mA VREF VQ L VQ L VQ L H-output current per output 10 µA VQ H = 30 VIQ H Threshold at 3 Hysteresis at 3 2.1 0.50.4 0.6 V V VS 3 VHy Turn-ON delay1) 600– 25 % – 25 % ms/ µF TA = 25 ˚CtD ON Switching frequency w/o CI 5 kHzfS 1) TCA 305 only 2) Values in parenthesis apply to TCA 355 only 3) Operation at voltages less than 5 V (between approx. 2.5 and 5 V) is possible, ifVREF is connected toVS. In this caseVREF is no longer internally stabilized. Additionally, the pin "turn-on delay" is to be applied as follows: If no turn-on delay is needed, this pin has to be connected toVS. If, however, a turn-on delay is required, the charge current forD D has to be adjusted with an external resistor between this pin andVS (recommended value 390 k ).Ω

Oscilator Turn-ON Delay for TCA 305 A; G Integrating Capacitor Outputs

L0,C 0 Resonant circuit RHy Hysteresis adjustment RDi 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. R I;C I Integration element. At pin 3 (integrating capacitance) we recommend a capacitor of typ. 1 nF. To increase noise immunity this capacitor can be substituted by an RC circuit with, e.g.,RI = 1 M andC I = 10 nF. C D 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 C 0 (STYROFLEX ® ) fOSC Sn RA (Metal) C D 100

0.1 CuL

µH 1000 pF appr. 350 kHz 4 mm 8.2 k + 330 100 nF Ω Ω × 0.05 268 µH 1.2 nF appr. 280 kHz 8 mm 33 k 100 nF Ω N 22 (25× 8.9) mm 100 × 0.1 585 µH 3.3 nF appr. 115 kHz 15 mm 22 k + 2.7 k 100 nF Ω Ω