CS3361

CS3361 CS3361 Alternator Voltage Regulator FET Driver Description The CS3361 integral alternator regulator integrated circuit provides the voltage regulation for automotive, 3-phase alternators. It drives an external logic level N channel enhancement power FET for control of the alternator field current. In the event of a charge fault, a lamp output pin is provided to drive an external darlington transistor capable of switching on a fault indicator lamp. An overvoltage or no Stator signal condition activates the lamp output. The CS3361 is available in a 14 lead SO package. Features s Drives Logic Level Power NFET s 80V Load Dump s Temperature Compensated Regulation Voltage s Shorted Field Protection Duty Cycle, Self Clearing Absolute Maximum Ratings Storage Temperature Range .....................................................-55°C to +165°C Junction Temperature Range ....................................................-40°C to +150°C Continuous Supply..........................................................................................27V ICC Load Dump .........................................................................................400 mA Lead Temperature Soldering Reflow (SMD styles only)............60 sec. max above 183°C, 230°C peak Block Diagram VCC Load Dump Detection and Protection VSUP Package Options 14 Lead SO IGN ENABLE Series Regulator DD Gnd NC OSC 1 SC NC VCC Sense STATOR NC IGN OSC VSUP RS Flop Set Dominate Q Lamp Indicator S R OSC Lamp NC NC Sense + – + – VREG + – VHV R Device Driver DELAY ENABLE STATOR Power Up LAMP STATOR Timer VSUP Gnd SC STATOR Cherry Semiconductor Corporation 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885-3600 Fax: (401)885-5786 Email: info@cherry-semi.com Web Site: www.cherry-semi.com Rev. 1/29/99 1 A ® Company CS3361 Electrical Characteristics: -40°C < TA < 125°C, -40°C < TJ < 150°C, 9V ≤ VCC ≤ 17V; unless otherwise specified. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT s Supply Supply Current Enabled Supply Current Disabled s Driver Stage Output High Voltage Output High Current Output Low Voltage Minimum ON Time Minimum Duty Cycle Short Circuit Duty Cycle Field Switch Turn On Rise Time Fall Time s Stator Input High Voltage Input Low Voltage Stator Time Out s Lamp Output High Current Output Low Voltage s Ignition Input High Voltage Input Low Voltage s Oscillator Oscillator Frequency Rise Time/Fall Time Oscillator High Threshold s Battery Sense Input Current Regulation Voltage Proportional Control High Voltage Threshold Ratio High Voltage Hysteresis – – 10 50 mA µA 5.5 VDD = 1.2V IOL = 25µA COSC = 0.022µF -10 – 200 – 1 15 15 -6 12 -4 0.35 10 5 75 75 V mA V µs % % µs µs 6 High to Low 10 – 6 100 6 600 V V ms VLAMP @ 3V ILAMP @ 30mA – – 50 0.35 µA V ICC > 1mA ICC < 100µA 1.8 – – 0.5 V V COSC = 0.022µF COSC = 0.022µF COSC = 0.022µF 90 17 – 210 – 4.5 Hz – V @25°C, R1 = 100kΩ, R2 = 50kΩ VHigh Voltage @ Lamp On VRegulation @ 50% Duty Cycle -10 13.8 0.10 1.083 0.020 +10 15.8 0.25 1.190 0.600 µA V V V 2 CS3361 Package Pin Description PACKAGE PIN # PIN SYMBOL FUNCTION 14 Lead SO 1 2 3, 6, 7, 9, 13 4 5 8 10 11 12 14 Driver Gnd NC OSC Lamp IGN Stator Sense VCC SC Output driver for external power switch. Ground. No connection. Timing capacitor for oscillator. Base driver for lamp driver indicates no stator signal or overvoltage condition. Switched ignition power up. Stator signal input for stator timer. Battery sense voltage regulator comparator input and protection. Supply for IC. Short circuit sensing. Typical Performance Characteristics CS3361 Battery Voltage vs Temperature (°C) Over Process Variation 15.5 15 Battery Voltage 14.5 14 13.5 13 −40 −20 0 20 40 60 80 100 120 Temperature (°C) 3 CS3361 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 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 2, a typical application diagram, the oscillator frequency is set by an external capacitor connected 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 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. A Regulator S I Lamp Indicator STATOR Winding IGNITION SWITCH FIELD Gnd BATTERY FIELD Winding Figure 1. IAR System Block Diagram RECTIFIER STATOR S A R3 250Ω R1 100kΩ *C2 10µF VCC Sense C1 0.1µF 18kΩ R4 SC R5 10kΩ D1 STATOR F Q1 Logic level N channel enhancement power FET POWER GROUND Lamp Indicator C3 .047µF Driver R2 50kΩ OSC IGN LAMP Gnd FIELD C4 0.022µF R6 20kΩ R9 2.4kΩ I R7 10Ω R10 510Ω IGNITION SWITCH Power Darlington BATTERY *Note: C2 optional for reduced jitter. Figure 2. Typical Application Diagram 4 CS3361 Package Specification PACKAGE DIMENSIONS IN mm (INCHES) PACKAGE THERMAL DATA D Lead Count 14L SO Metric Max Min 8.75 8.55 English Max Min .344 .337 Thermal Data RΘJC typ RΘJA typ 14L SO 30 125 ˚C/W ˚C/W Surface Mount Narrow Body (D); 150 mil wide 4.00 (.157) 3.80 (.150) 6.20 (.244) 5.80 (.228) 0.51 (.020) 0.33 (.013) 1.27 (.050) BSC 1.75 (.069) MAX 1.57 (.062) 1.37 (.054) 1.27 (.050) 0.40 (.016) 0.25 (.010) 0.19 (.008) D REF: JEDEC MS-012 0.25 (0.10) 0.10 (.004) Ordering Information Part Number CS3361YD14 CS3361YDR14 Description 14L SO 14L SO (tape & reel) Cherry Semiconductor Corporation reserves the right to make changes to the specifications without notice. Please contact Cherry Semiconductor Corporation for the latest available information. Rev. 1/29/99 5 © 1999 Cherry Semiconductor Corporation