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CS3341/51/386/387 Datasheet, Darlington Driver Device in Alternator Charging System
The CS3341 IC’s series from Cherry Semiconductor are designed for use in alternator charging system particularly the 
CS3341 and CS3351. This device drives an external power Darlington for controlling the alternator field current and provides 3-phase alternators-the voltage regulation for automotive.
The circuit diagram shows you a typical application of The CS3341 IC’s series. The oscillator frequency is set by an external capacitor connected between OSC and ground. According to the datasheet, the alternator voltage is sensed at Terminal A via the resistor divider network R1/R2 on the Sense pin of the IC. Voltage at sense pin means the duty cycle for the regulator and adjusted by potentiometer R2. The Lamp pin goes high when an overvoltage is detected on sense pin and make the darlington lamp drive transistor to switch on and pull current through the lamp.
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