TCA 305
TCA 355
Proximity Switch
TCA 305
TCA 355
Bipolar IC
Features
q
Lower open-loop current consumption;
I
S
< 1 mA
q
Lower output saturation voltage
q
The temperature dependence of the switching
distance is lower and compensation of the resonant
circuit
TC
(temperature coefficient) is easier
q
The sensitivity is higher, so that larger switching
P-DSO-8-1
distances are possible and coils of a lower quality can
be used
q
The switching hysteresis remains constant as regards
temperature, supply voltage and switching distance
q
The TCA 305 even functions without external
integrating capacitor. With an external capacitor (or
with RC combination) good noise immunity can be
achieved
q
The outputs are temporarily short-circuit proof (approx.
10 s to 1 min depending on package)
q
The outputs are disabled when
V
S
< approx. 4.5 V and
P-DIP-14-1
are enabled when the oscillator stabilizes
(from
V
S min
= 5 V)
q
Higher switching frequencies can be obtained
q
Miniature package
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 out-
standing 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
T
A
= 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
V
S
= 12 V,
T
A
= – 25 to 85 ˚C
Parameter
Open-loop
current consumption
Reference voltage
1)
L-output voltage
per output
H-output current per output
Threshold at 3
Hysteresis at 3
Turn-ON delay
1)
Switching frequency w/o
C
I
1)
2)
3)
Symbol Limit Values
V
S
V
Q
I
Q
R
Di
,
R
Hy
C
I
,
C
D
T
j
T
stg
R
th SA
R
th SA
35
35
50
0
5
150
– 55 to 125
85 (135)
2)
140 (200)
2)
Unit
V
V
mA
Ω
µ
F
˚C
˚C
K/W
K/W
V
S
f
OSC
T
A
5 to 30
3)
0.015 to 1.5
– 25 to 85
V
MHz
˚C
Symbol
min.
I
S
V
REF
V
Q L
V
Q L
V
Q L
I
Q H
V
S 3
V
Hy
t
D ON
f
S
0.4
Limit Values
typ.
0.6
max.
0.9
(1.0)
2)
Unit
mA
V
V
V
V
µ
A
Test
Condition
outputs open
I
REF
< 10
µ
A
I
Q L
= 5 mA
I
Q L
= 25 mA
I
Q L
= 50 mA
V
Q 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/
µ
F
T
A
= 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
V
REF
is connected to
V
S
. In
this case
V
REF
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
V
S
. If, however, a turn-on delay is required, the
charge current for
D
D
has to be adjusted with an external resistor between this pin and
V
S
(recommended
value 390 k
Ω
).
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
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