CS3361 CS3361 Alternator Voltage Regulator FET Driver Features 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. ■ Drives Logic Level Power NFET The CS3361 is available in a 14 lead SO package. ■ Shorted Field Protection Duty Cycle, Self Clearing ■ 80V Load Dump ■ Temperature Compensated Regulation Voltage 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 Package Options Block Diagram VCC 14 Lead SO DD Load Dump Detection and Protection ENABLE Series Regulator IGN VSUP Gnd SC NC NC VCC 1 Sense OSC OSC OSC VSUP Sense + – + – R Lamp Indicator RS Flop Set Dominate Q VREG S NC STATOR NC NC IGN Device Driver R + – Lamp DELAY VHV ENABLE SC STATOR Power Up LAMP STATOR Timer STATOR VSUP Gnd Cherry Semiconductor Corporation 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885-3600 Fax: (401)885-5786 Email: [email protected] 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 ■ Supply Supply Current Enabled Supply Current Disabled ■ 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 MIN TYP – – 5.5 VDD = 1.2V -10 – 200 – 1 IOL = 25µA COSC = 0.022µF MAX UNIT 10 50 mA µA 12 V -6 -4 0.35 6 10 5 mA V µs % % 75 75 µs µs 6 600 V V ms 15 15 ■ Stator Input High Voltage Input Low Voltage Stator Time Out High to Low ■ Lamp Output High Current Output Low Voltage VLAMP @ 3V ILAMP @ 30mA – 50 µA – 0.35 V ■ Ignition Input High Voltage Input Low Voltage ICC > 1mA ICC < 100µA 1.8 – V – 0.5 V 210 Hz – – 4.5 – V -10 13.8 0.10 1.083 +10 15.8 0.25 1.190 µA V V 0.020 0.600 V ■ Oscillator Oscillator Frequency Rise Time/Fall Time Oscillator High Threshold ■ Battery Sense Input Current Regulation Voltage Proportional Control High Voltage Threshold Ratio High Voltage Hysteresis 10 – 6 COSC = 0.022µF COSC = 0.022µF COSC = 0.022µF 100 90 17 @25°C, R1 = 100kΩ, R2 = 50kΩ VHigh Voltage @ Lamp On VRegulation @ 50% Duty Cycle 2 PACKAGE PIN # PIN SYMBOL FUNCTION 14 Lead SO 1 Driver Output driver for external power switch. 2 Gnd Ground. 3, 6, 7, 9, 13 NC No connection. 4 OSC Timing capacitor for oscillator. 5 Lamp Base driver for lamp driver indicates no stator signal or overvoltage condition. 8 IGN Switched ignition power up. 10 Stator Stator signal input for stator timer. 11 Sense Battery sense voltage regulator comparator input and protection. 12 VCC Supply for IC. 14 SC Short circuit sensing. Typical Performance Characteristics CS3361 Battery Voltage vs Temperature (°C) Over Process Variation 15.5 Battery Voltage 15 14.5 14 13.5 13 −40 −20 0 20 40 60 80 100 120 Temperature (°C) 3 CS3361 Package Pin Description 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 Lamp Indicator Regulator I S STATOR Winding IGNITION SWITCH FIELD Gnd BATTERY FIELD Winding Figure 1. IAR System Block Diagram RECTIFIER STATOR S A R3 250Ω R1 100kΩ C1 0.1µF *C2 10µF 18kΩ R4 STATOR VCC SC D1 R5 F 10kΩ Sense C3 .047µF R2 50kΩ R7 10Ω Q1 Logic level N channel enhancement power FET OSC IGN C4 0.022µF Driver LAMP Gnd R6 20kΩ POWER GROUND FIELD I Lamp Indicator R9 R10 510Ω 2.4kΩ Power Darlington IGNITION SWITCH BATTERY *Note: C2 optional for reduced jitter. Figure 2. Typical Application Diagram 4 CS3361 Package Specification PACKAGE THERMAL DATA PACKAGE DIMENSIONS IN mm (INCHES) D Lead Count 14L SO Metric Max Min 8.75 8.55 Thermal Data RΘJC typ RΘJA typ English Max Min .344 .337 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 0.25 (0.10) 0.10 (.004) REF: JEDEC MS-012 Ordering Information Part Number CS3361YD14 CS3361YDR14 Rev. 1/29/99 Cherry Semiconductor Corporation reserves the right to make changes to the specifications without notice. Please contact Cherry Semiconductor Corporation for the latest available information. Description 14L SO 14L SO (tape & reel) 5 © 1999 Cherry Semiconductor Corporation