поискавой системы для электроныых деталей |
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CS3341 датащи(PDF) 5 Page - ON Semiconductor |
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CS3341 датащи(HTML) 5 Page - ON Semiconductor |
5 / 8 page CS3341, CS3351, CS387 http://onsemi.com 5 TYPICAL PERFORMANCE CHARACTERISTICS Figure 2. Battery Voltage vs. Temperature ( °C) Over Process Variation 15.5 15 14.5 14 13.5 13 −40 −20 0 20 40 60 80 100 120 Temperature ( °C) APPLICATIONS INFORMATION The CS3341 and CS3351 IC’s are designed for use in an alternator charging system. The circuit is also available in flip−chip form as the CS387. In a standard alternator design (Figure 3), the rotor carries the field winding. An alternator rotor usually has several N and S poles. The magnetic field for the rotor is produced by forcing current through a field or rotor winding. The Stator windings are formed into a number of coils spaced around a cylindrical core. The number of coils equals the number of pairs of N and S poles on the rotor. The alternating current in the Stator windings is rectified by the diodes and applied to the regulator. By controlling the amount of field current, the magnetic field strength is controlled and hence the output voltage of the alternator. Referring to Figure 7, a typical application diagram, the oscillator frequency is set by an external capacitor connected between OSC and ground. The sawtooth waveform ramps between 1.0 V and 3.0 V and provides the timing for the system. For the circuit shown the oscillator frequency is approximately 140 Hz. The alternator voltage is sensed at Terminal A via the resistor divider network R1/R2 on the Sense pin of the IC. The voltage at the sense pin determines the duty cycle for the regulator. The voltage is adjusted by potentiometer R2. A relatively low voltage on the sense pin causes a long duty cycle that increases the Field current. A high voltage results in a short duty cycle. The ignition Terminal (I) switches power to the IC through the VCC pin. In the CS3351 the Stator pin senses the voltage from the stator. This will keep the device powered while the voltage is high, and it also senses a stopped engine condition and drives the Lamp pin high after the stator timeout expires. The Lamp pin also goes high when an overvoltage condition is detected on the sense pin. This causes the darlington lamp drive transistor to switch on and pull current through the lamp. If the system voltage continues to increase, the field and lamp output turn off as in an overvoltage or load dump condition. The SC or Short Circuit pin monitors the field voltage. If the drive output and the SC voltage are simultaneously high for a predetermined period, a short circuit condition is assumed and the output is disabled. The regulator is forced to a minimum short circuit duty cycle. Figure 3. IAR System Block Diagram BATT Ignition Switch Regulator A GND I S FIELD FIELD Winding STATOR Winding Lamp Indicator |
Аналогичный номер детали - CS3341_09 |
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Аналогичное описание - CS3341_09 |
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