Product Description

Automotive Direction Indicator IC

Description

• The bipolar integrated circuit LT4761 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 Ordering Information

• Quiescent current <5mA
• Wide operating voltage, up to 33V
• Strong anti-interference ability

Functional Description

• The circuit is directly coupled by an external RC circuit that input 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 (±100V), the protection circuit automatically turns on shunting and clamping limit, to interference protection purposes.
• The relay drive current output of the circuit is 120-200mA.