The bipolar integrated circuit LT***1 is used in relay-controlled automotive flashers
where a high-level EMC is required.
Lamp outage is indicated by frequency doubling during hazard warning as well as
direction mode.
Features
●Quiescent current ●Wide operating voltage, up to *3V
● Strong anti-interference ability
Functional Description
The circuit is directly coupled by an external RC circuit that triangular wave oscillation signal,
through a controlled oscillator, current amplification, the output drive capability with a strong square wave
pulse.
When the sampling resistor Rs monitoring to reduce the half of lamp load, the corresponding voltage
comparator action, causing changes in the oscillation frequency doubles.
When the supply voltage produces a transient pulse (±**0V), the protection circuit automatically turns on
shunting and clamping limit, to interference protection purposes.
The relay drive current output of the circuit is ******0mA.