ITT - Index of

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I mm
TAA775G
POWER OSCILLATOR
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SEMICONDUCTORS
POWER OSCILLATOR
Monolithic integrated circuit in bipolar technique.
Particularly suited as electronic pulse
generator for direction blinker and emergency
blinker in cars with 12 V DC supply. Also
suited for other applications, e. g. for interval
wind-screen wipers.
The TAA775G is an oscillator, the frequency of
which is determined by an external RC network
and which supplies rectangular output pulses.
The output terminal 10 is connected to the collector
of the output transistor operating in
common emitter configuration. An integrateddiode
between the collector of the output
transistor and the supply voltage terminal 1
allows for operation with inductive loads.
As can be seen from the terminal diagram
Fig. 1, the TAA775G has two oscillator input
terminals 5 and 6, for the connection of the
frequency-determining RC network. By applying
a suitable control voltage to the control
input (terminal 7) the following operating modes
are possible (see Fig. 5):
a) Operation at nominal frequency fo
b) Operation at increased frequency f'o
c) Oscillator not oscillating
When a control voltage for operating mode a)
or b) is applied, oscillation starts in the onstate.
Since the control voltage is effective
only during the off-state, blocking of the oscillator
in the on-state is possible only at the
end of the normal on-state.
Maximum Ratings (All voltages are referred to
terminals 3 and S.)
Terminals 3 and S grounded
V, Supply Voltage ............... 15V
V,
V,O
1,0
Tamb
Control voltage .....•..•......