ITT - Index of

TAA775G
POWER OSCILLATOR
Dynamic Characteristics raJV, = 12V, V,=V,=OV,
Tomb=25°C (see Fig. 4)
C5
Frequency-determining
resistor ............... 1 to 120krl
Frequency-determining
capacitor ...... optional, but the
leakage cu rrent of
the capacitor must
be taken into consideration
Oscillator frequency (see Fig. 5)
at V,=O to 0.35V ........ fo= ~ Hz
R5i"XC,
R'i" in kO
C, in /LF
at V,=0.45 to 5V .............. 1'o=2.2fo
at V,=8V to V, ............ f"o=O; Output
transistor blocked
on/off ratio (see Fig. 5)
at V,=O to 0.35V ........... ton/toll=0.8
at V,=0.45 to 5V ........... t'on/t'oll=1.1
Application of the TAA775G as direction and
emergency blinker (See Circuit Diagram)
In conjunction with a frequency-determining RC
network (e. g. R'16 = 5.6 krl, C, = 100/LF/6 V)
and a relay (coil resistance min. 1000) the
TAA775G replaces a conventional hot wire interval
switch and a current monitoring relay.
The previous arrangement of the terminals on
the blinker relay package (plus and minus pole
of the battery and connection to steering-wheel
changeover switch) can be retained. In the
case of direction, blinking, the bulbs are monitored:
the breakdown of a bulb causes a greatly
increased blink frequency. The capacitor C"
p"revents battery voltage transients affecting the
operation of the TAA775G.
Characteristics of a blinker circuit using TAA·
775G at V,=12V, Tamb=25°C, as in circuit Fig.6
Operation starts with a bright interval
t
fo
Duration of the first
bright interval ............