Semiconductor Group 1
TCA 305
TCA 355
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
●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
Semiconductor Group 2
TCA 305
TCA 355
TCA 305 A
TCA 305 G
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
LL
H
TCA 355 G
Pin Configurations (top view)
Semiconductor Group 3
TCA 305
TCA 355
Block Diagram
Standard Turn-ON Delay Referred to TA= 25 ˚C
Semiconductor Group 4
TCA 305
TCA 355
Absolute Maximum Ratings
Operating Range
Characteristics
VS = 12 V, TA = – 25 to 85 ˚C
Parameter Symbol UnitLimit Values
Supply voltage
Output voltage VS
VQ35
35
Output current IQmA50
V
V
Junction temperature
Storage temperature range Tj
Tstg 150
– 55 to 125 ˚C
˚C
Thermal resistance
system - air TCA 305 A
TCA 305 G Rth SA
Rth SA 85 (135)2)
140 (200)2) K/W
K/W
Distance, hysteresis resistance RDi,RHy Ω0
Capacitances CI,CDµF5
Supply voltage VSV
5 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
IREF< 10 µA
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 µAVQ 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/µFTA = 25 ˚CtD ON
Switching frequency w/o CI5 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, 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 ).
Ω
Semiconductor Group 5
TCA 305
TCA 355
Schematic Circuit Diagram
Oscilator Turn-ON Delay for TCA 305 A; G
Integrating Capacitor Outputs
Semiconductor Group 6
TCA 305
TCA 355
Application Circuit
Semiconductor Group 7
TCA 305
TCA 355
L0,C0Resonant circuit
RHy Hysteresis adjustment
RDi Distance adjustment
DTemperature 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;CIIntegration 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.
CDDelay 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
L
0
C0 (STYROFLEX®)
fOSC
Sn
R
A (Metal)
CD
M 33 (7.35 ×3.6) mm
100
0.1 CuL
206 µH
1000 pF
appr. 350 kHz
4 mm
8.2 k + 330
100 nF
Ω
Ω
N 22 (14.4 × 7.5) mm
80
20 × 0.05
268 µH
1.2 nF
appr. 280 kHz
8 mm
33 k
100 nF
Ω
N 22 (25 × 8.9) mm
100
10 × 0.1
585 µH
3.3 nF
appr. 115 kHz
15 mm
22 k + 2.7 k
100 nF
Ω
Ω
