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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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CS3361YDR14 데이터시트(PDF) 4 Page - Cherry Semiconductor Corporation |
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CS3361YDR14 데이터시트(HTML) 4 Page - Cherry Semiconductor Corporation |
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4 / 5 page  4 Application Information The CS3361 is designed for use in an alternator charging system. In a standard alternator design (Figure 1), 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 cur- rent 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. Figure 1. IAR System Block Diagram Referring to Figure 2, a typical application diagram, the oscillator frequency is set by an external capacitor connect- ed between OSC and ground. The sawtooth waveform ramps between 1V and 3V and provides the timing for the system. For the circuit shown the oscillator frequency is approximately 140Hz. 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. The Stator pin monitors the voltage from the stator and senses a stopped engine condition. It drives the Lamp pin high after the stator timeout expires. The Lamp pin also goes high when an overvoltage condition is detect- ed 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. BATTERY Lamp Indicator IGNITION SWITCH Regulator I Gnd FIELD A S FIELD Winding STATOR Winding Figure 2. Typical Application Diagram R2 10kΩ SC Driver Gnd STATOR Sense VCC OSC IGN 20kΩ C4 0.022µF 50kΩ C3 .047µF 100kΩ 250Ω C1 0.1µF 18kΩ BATTERY LAMP 2.4kΩ 10Ω Power Darlington Lamp Indicator IGNITION SWITCH POWER GROUND Logic level N channel enhancement power FET FIELD R5 R4 R3 R1 R6 R9 R7 R10 510Ω STATOR RECTIFIER A F I S D1 Q1 *C2 10µF *Note: C2 optional for reduced jitter. |
유사한 부품 번호 - CS3361YDR14 |
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유사한 설명 - CS3361YDR14 |
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