TCA505BG Infineon Technologies, TCA505BG Datasheet - Page 4

• Manufacturer Part Number: TCA505BG
• Description: Board Mount Motion & Position Sensors Proximity Switch w/ short-circuit prot.
• Manufacturer: Infineon Technologies

Specifications of TCA505BG

• Proximity Sensor Type: Inductive
• Mounting: Surface Mount
• Package Type: DSO
• Operating Temp Range: -40C to 110C
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 4V
• Operating Supply Voltage (typ): 5/9/12/15/18/24V
• Operating Supply Voltage (max): 40V
• Pin Count: 16
• Package / Case: DSO-16
• Maximum Operating Temperature: + 110 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / Rohs Status: Compliant

Functional Description
This circuit is used to design inductive proximity switches. The resonant circuit of the LC
oscillator is implemented with an open half-pot ferrite and a capacitor in parallel (pin LC). If a
metallic target is moved closer to the open side of the half-pot ferrite, energy is drawn from the
resonant circuit and the amplitude of the oscillation is reduced accordingly. This change in
amplitude is transmitted to a threshold switch by means of a demodulator and triggers the
outputs (see operation schematic).
By means of an external distance resistor on the oscillator (pin R
switching distance within wide limits, the optimal distances being 0.1 to 0.6 of the diameter of
the half-pot ferrite, although both of these parameters can be exceeded. The circuit also
enables the setting of a path hysteresis by switching of the external distance resistor via pin
R
There are two antiphase output stages (Q1 / Q2 and Q3 / Q4) for max. 50 mA. The output
transistors are driven in a floating state thus providing the user with optimal flexibility for
evaluation of the output signals. It is therefore possible to use the output transistors either as
emitter follower, open-collector, as a current source or in push-pull operation. When pin B is
connected to V
of the output transistors can be set on pin B. If B is connected to V
to 50 mA can be set on the outputs by means of resistors on Q2 or Q4 (see application
circuits 2 and 3).
Q1 through Q4 and also additional external output transistors can be protected against
destruction by short-circuit or overload. This is the purpose of pin SC which turns off the output
transistors periodically in the presence of overload.
By means of a capacitor on C
of short-circuit protection. The same capacitor also defines the turn-ON delay of the output
stages when the supply voltage is applied, whereby the output stages are inhibited during
buildup of the oscillator. Finally C
the turn-ON delay from running its full length at brief voltage dips on V
A switching regulator is incorporated for the voltage supply of the circuit when it is used as a
two-wire AC proximity switch, and this is activated when pin V
has a stabilized voltage of approx. 2.9 V that is brought out on pin V
Supply-voltage range: The operating range in normal operation is between 4 and 40 V. If pin
V
V
voltage.
Semiconductor Group
Hy
REF
REF
(see application circuit 1).
is connected to V
is no longer internally stabilized, i.e. the analog IC functions depend on the operating
REF
, Q2 and Q4 can be used between 0 V and V
S
, the circuit is operating between 3.1 and 4.5 V. In this case, however,
D
it is possible to set the response delay and the turn-OFF time
D
produces a turn-OFF delay of the output stages to prevent
4
REF
T
is connected to V
. The maximum base voltage
REF
Di
REF
) it is possible to set the
, any constant current up
S
.
.
TCA 505 BG
S
. The circuit