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| TCA 305 TCA 355 Proximity Switch TCA 305 TCA 355 Bipolar IC Features q q q 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 when VS < approx. 4.5 V and are enabled when the oscillator stabilizes (from VS min = 5 V) Higher switching frequencies can be obtained Miniature package P-DIP-14-1 P-DSO-8-1 q q q q q q q P-DSO-14-1 Type s TCA 305 A TCA 305 G TCA 355 G Ordering Code Q67000-A2291 Q67000-A2305 Q67000-A2444 Package P-DIP-14-1 P-DSO-14-1 (SMD) P-DSO-8-1 (SMD) s Not for new design Semiconductor Group 1 01.96 TCA 305 TCA 355 TCA 305 A TCA 355 G TCA 305 G Pin Configurations (top view) 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 outstanding for the following characteristics: Logic Functions Oscillator not damped damped Outputs Q H L L H Semiconductor Group 2 TCA 305 TCA 355 Block Diagram Standard Turn-ON Delay Referred to TA = 25 C Semiconductor Group 3 TCA 305 TCA 355 Absolute Maximum Ratings Parameter Supply voltage Output voltage Output current Distance, hysteresis resistance Capacitances Junction temperature Storage temperature range Thermal resistance system - air TCA 305 A TCA 305 G Operating Range Supply voltage Oscillator frequency Ambient temperature Characteristics VS = 12 V, TA = - 25 to 85 C Parameter Open-loop current consumption Reference voltage1) L-output voltage per output H-output current per output Threshold at 3 Hysteresis at 3 Turn-ON delay1) Switching frequency w/o CI 1) 2) 3) Symbol Limit Values VS VQ IQ RDi, RHy CI, CD Tj Tstg Rth SA Rth SA 35 35 50 0 5 150 - 55 to 125 85 (135)2) 140 (200)2) Unit V V mA F C C K/W K/W VS fOSC TA 5 to 303) 0.015 to 1.5 - 25 to 85 V MHz C Symbol min. IS VREF VQ L VQ L VQ L IQ H VS 3 VHy tD ON fS 0.4 Limit Values typ. 0.6 max. 0.9 (1.0)2) Unit mA V V V V A Test Condition outputs open IREF< 10 A IQ L = 5 mA IQ L = 25 mA IQ L = 50 mA VQ H = 30 V 3.2 0.04 0.15 0.10 0.35 0.22 0.75 10 2.1 0.5 0.6 - 25 % 5 V V ms/F TA = 25 C kHz - 25 % 600 TCA 305 only Values in parenthesis apply to TCA 355 only Operation at voltages less than 5 V (between approx. 2.5 and 5 V) is possible, if VREF is connected to VS. In this case VREF 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 to VS. If, however, a turn-on delay is required, the charge current for DD has to be adjusted with an external resistor between this pin and VS (recommended value 390 k ). Semiconductor Group 4 TCA 305 TCA 355 Oscilator Turn-ON Delay for TCA 305 A; G Integrating Capacitor Outputs Schematic Circuit Diagram Semiconductor Group 5 TCA 305 TCA 355 Application Circuit Semiconductor Group 6 TCA 305 TCA 355 L0, C0 RHy RDi D Resonant circuit Hysteresis adjustment Distance adjustment 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 substituted by an RC circuit with, e.g., RI = 1 M and CI = 10 nF. Delay capacitor RI; CI CD Dimensioning Examples in Accordance with CENELEC Standard (flush) M 12 Ferrite pot core Number of turns Cross section of wire L0 C0 (STYROFLEX(R)) fOSC Sn RA (Metal) CD M 33 (7.35 x 3.6) mm 100 0.1 CuL 206 H 1000 pF appr. 350 kHz 4 mm 8.2 k + 330 100 nF M 18 N 22 (14.4 x 7.5) mm 80 20 x 0.05 268 H 1.2 nF appr. 280 kHz 8 mm 33 k 100 nF M 30 N 22 (25 x 8.9) mm 100 10 x 0.1 585 H 3.3 nF appr. 115 kHz 15 mm 22 k + 2.7 k 100 nF Semiconductor Group 7 |
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