TCA355G

TCA 305 TCA 355 Proximity Switch TCA 305 TCA 355 Bipolar IC 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 when VS < approx. 4.5 V and are enabled when the oscillator stabilizes (from VS min = 5 V) ● Higher switching frequencies can be obtained ● Pb-free lead plating; RoHS compliant PG-DSO-8-1 PG-DIP-14-1 PG-DSO-14-1 Type Ordering Code Package ■ TCA 305 A TCA 305 G Q67000-A2291 PG-DIP-14-1 Q67000-A2305 PG-DSO-14-1 (SMD) TCA 355 G Q67000-A2444 PG-DSO-8-1 (SMD) ■ Not for new design Semiconductor Group 1 02.05 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 Symbol Limit Values Unit Supply voltage Output voltage Output current VS VQ IQ 35 35 50 V V mA Distance, hysteresis resistance RDi, RHy 0 Ω Capacitances CI, CD 5 µF Junction temperature Storage temperature range Thermal resistance system - air TCA 305 A TCA 305 G Tj Tstg 150 – 55 to 125 ˚C ˚C Rth SA Rth SA 85 (135)2) 140 (200)2) K/W K/W Supply voltage VS 5 to 303) V Oscillator frequency fOSC 0.015 to 1.5 MHz Ambient temperature TA – 25 to 85 ˚C Operating Range Characteristics VS = 12 V, TA = – 25 to 85 ˚C Parameter Symbol Limit Values min. Unit Test Condition mA outputs open V V V V IREF< 10 µA IQ L = 5 mA IQ L = 25 mA IQ L = 50 mA 10 µA VQ H = 30 V 0.6 V V – 25 % ms/µF TA = 25 ˚C 5 kHz Open-loop current consumption IS typ. 0.6 Reference voltage1) L-output voltage per output VREF VQ L VQ L VQ L 3.2 0.04 0.15 0.10 0.35 0.22 0.75 H-output current per output IQ H Threshold at 3 Hysteresis at 3 VS 3 VHy 0.4 Turn-ON delay1) tD ON – 25 % 600 Switching frequency w/o CI fS 2.1 0.5 max. 0.9 (1.0)2) 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, 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 kΩ ). Semiconductor Group 4 TCA 305 TCA 355 Turn-ON Delay for TCA 305 A; G Oscilator Integrating Capacitor Outputs Schematic Circuit Diagram Semiconductor Group 5 TCA 305 TCA 355 Application Circuit Semiconductor Group 6 TCA 305 TCA 355 L0, C0 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. RI; CI 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 MΩ and CI = 10 nF. CD Delay capacitor Dimensioning Examples in Accordance with CENELEC Standard (flush) Ferrite pot core Number of turns Cross section of wire L0 C0 (STYROFLEX®) fOSC Sn RA (Metal) CD Semiconductor Group M 12 M 18 M 30 M 33 (7.35 × 3.6) mm 100 0.1 CuL 206 µH 1000 pF appr. 350 kHz 4 mm 8.2 kΩ + 330 Ω 100 nF N 22 (14.4 × 7.5) mm 80 20 × 0.05 268 µH 1.2 nF appr. 280 kHz 8 mm 33 kΩ 100 nF N 22 (25 × 8.9) mm 100 10 × 0.1 585 µH 3.3 nF appr. 115 kHz 15 mm 22 kΩ + 2.7 kΩ 100 nF 7