TCA205 SIEMENS | Alldatasheet
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@ Large supply voltage range @ High output current @ Antivalent outputs @ Adjustable switching distance @ Adjustable hysteresis @ Turn-on delay POMP -94 Type Package BTCA 205A Q67000-A1034 P-DIP-14 ® Not for new design. This IC is intended for applications in inductive proximity switches. The outputs switch when the oscillation is damped, e.g. by the approach of a metal object. Operation Schematic Oscillator not damped of 7 \\ Copper Wire Half -Pot Ferrite Oscillator damped 3] 7, N a cot - on N : : tesooTs?
(top view) Gnol}1 14] | Hysteresis Oistance[ | 2 13] | Oscillator Inti U Capucitonee [}3 12] | Oscillator nel ]s NE] +s 8 output [] 5 wf ]nc GNO[] 6 91] Turn-On-Delay Q Output (] 7 af]nc TEPOOI93 Block Diagram Vs Turn-On Delay 4" 9 Regulator. Delay STL
7 Output a
12 Oscillator Rectifier i Oriver
at SAT ETT] TT] > . | / Switch § Output O 2 4% 3 1.6 Oistonce Hysteresis Integration GND Capacitance ve@0035T
Parameter | Symbol | Limit Values | Unit Output voltage v . Output current [ios Storage temperature range Tetg —55 to 125 Me] system -—air TCA205A KW Operating Range Supply voltage [vs 475tos0 dV Ambient temperature °c Characteristics Vs = 12 V, Ty = 25°C |__ Limit Values | Parameter apni as Tom | a Test Conditions a current consumption Is open pins reminmmmrees Ta | a te [| fscata Vou Vv Tg. = 50 mA Howtputcureniperoutut [on | | [10 {WA _| Von=d0V Integrating capacitance [oa | ft Internal resistance at 3 | fs | 200 | 360 | 660 | kQ | Threshold voltage at 3 Mes | [13 |1s [vf Turn-on delay [ton | | 200 |__| msvuF| seme 1 | PT Switching frequency without C, 1) Parallel connection of Aj,, to Ro, may at least amount to 6 kQ
‘Schematic Circuit Diagrams Oscillator Turn-on delay ' | | ‘Demodulator | Cy | Output | Trans:stors. Threshold ‘Switch, resaurss a 12 2 % 4 1ESO0796 Integrating capacitor Outputs vy Oemodular i Re i} 8.7 i | G bi : I TESTIS 3 a soo Siemens Aktiengesellschaft 802
with 1 coil as proximity switch ___ Ve Ms with 2 coils as slot switch. _ 9 Re et 2 Tog H ; TCA 205 ; osc2_13 5 og Lo i 2 re 3 9 g to Ke To Tt GND ~ esos Lo.C, oscillator Ry distance adjustment Ruy hysteresis adjustment Cc integrating capacitor Cy delay capacitor The resistance of distance and hysteresis Ro, and Ry,,, for proximity switch TCA 205 A; may be applied as follows: 4. Series hysteresis 2. Parallel hysteresis
2 TCA25 tH 2 TCA20S = 1h
Circuit 1 is more suitable for proximity switches with oscillator frequencies of f > 200 kHz to 300 kHz, and small distances. Circuit 2 is more favorable for AF proximity switches having larger distances. This is due to the lower R,,, values enabled by circuit 1 (min. 0 Q) compared with 2 circuit 2 (min. 6 kQ). Starting at frequencies of 200 kHz, high R,,, values effect in addition to the hysteresis also the oscillator phase. Practical applications, however, require little phase response to receive a clear evaluation. Siemens Aktiengesellschaft 803
Application Example for a Proximity Switch Coil data pot core B65939-A-X22 coilformer B65940-A-M1 O =25mmx8.9mm Lo = 642 pH n= 100 CuLS 30 x 0.05 Measuring plate = 30 mm x 30 mm x1 mm, Fe Circuitry Ro = 56 to 200 kQ, metal layer Ry = 00 circuit 2 C.= 1500 pF, STYROFLEX f= 162 kHz Switching distance versus: ambient temperature sepoceon
13 T T T [OFF ~
12 ——T | s Roj= 200kQ ! nf to a 10 + + gl ae | OFF >on. | Roz 56K2 poe _ Li or) | -40 -20 0 20 40 60 80% ca) Siemens Aktiengesellschaft 804