CS3361 Alternator Voltage Regulator FET Driver 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. A STATOR Power Up feature is incorporated for systems which require power up activation by sensing the crank cycle of the starter at the stator. This eliminates unnecessary current drain when the ignition is turned on, but the car is not running. The CS3361 is available in an SO–14 package. This IC has customized current sense circuitry enabling it to drive FET transistors. http://onsemi.com SO–14 D SUFFIX CASE 751A 14 1 PIN CONNECTIONS AND MARKING DIAGRAM Features • Drives Logic Level Power NFET • 80 V Load Dump • Temperature Compensated Regulation Voltage • Shorted Field Protection Duty Cycle, Self Clearing • STATOR Power Up 1 A WL, L YY, Y WW, W 14 CS3361 AWLYWW DD GND NC OSC Lamp NC NC SC NC VCC Sense STATOR NC IGN = Assembly Location = Wafer Lot = Year = Work Week ORDERING INFORMATION Semiconductor Components Industries, LLC, 2002 August, 2002 – Rev. 10 1 Device Package Shipping CS3361YD14 SO–14 55 Units/Rail CS3361YDR14 SO–14 2500 Tape & Reel Publication Order Number: CS3361/D CS3361 VCC Load Dump Detection and Protection ENABLE Series Regulator IGN VSUP OSC OSC VSUP Regulator Comparator Sense + + + R – RS Flop Set Dominate Q VREG Lamp Indicator S Device Driver R High Voltage Comparator DELAY + – SC VHV ENABLE STATOR Power Up LAMP STATOR Timer VSUP GND Figure 1. Block Diagram http://onsemi.com 2 STATOR CS3361 MAXIMUM RATINGS* Rating Value Unit Storage Temperature Range, TS –55 to +165 °C Junction Temperature Range –40 to 150 °C Continuous Supply 27 V ICC Load Dump (@ VCC = 80 Vpeak) 400 mA 230 peak °C Lead Temperature Soldering: 1. 60 second maximum above 183°C. *The maximum package power dissipation must be observed. Reflow: (SMD styles only) (Note 1) ELECTRICAL CHARACTERISTICS (–40°C < TA < 125°C, –40°C < TJ < 150°C, 9.0 V ≤ VCC ≤ 17 V; unless otherwise specified.) Characteristic Test Conditions Min Typ Max Unit Supply Current Enabled – – – 10 mA Supply Current Disabled – – – 50 µA – 5.5 – 12 V Supply Driver Stage Output High Voltage Output Low Voltage IOL = 25 µA – – 0.35 V Output High Current VDD = 1.2 V –10 –6.0 –4.0 mA Minimum ON Time COSC = 0.022 µF 200 – – µs Minimum Duty Cycle – – 6.0 10 % Short Circuit Duty Cycle – 1.0 – 5.0 % Field Switch Turn On Rise Time – 15 – 75 µs Field Switch Turn On Fall Time – 15 – 75 µs Input High Voltage – 10 – – V Input Low Voltage – – – 6.0 V 6.0 100 600 ms Stator Stator Time Out High to Low Lamp Output High Current VLAMP @ 3.0 V – – 50 µA Output Low Voltage ILAMP @ 30 mA – – 0.35 V Ignition Input High Voltage ICC > 1.0 mA 1.8 – – V Input Low Voltage ICC < 100 µA – – 0.5 V Oscillator Frequency COSC = 0.022 µF 90 – 210 Hz Rise Time/Fall Time COSC = 0.022 µF – 17 – – Oscillator High Threshold COSC = 0.022 µF – – 4.5 V Oscillator http://onsemi.com 3 CS3361 ELECTRICAL CHARACTERISTICS (continued) (–40°C < TA < 125°C, –40°C < TJ < 150°C, 9.0 V ≤ VCC ≤ 17 V; unless otherwise specified.) Characteristic Test Conditions Min Typ Max Unit – –10 – +10 µA 13.8 – 15.8 V 0.10 – 0.25 V 1.083 – 1.190 V/V 0.020 – 0.600 V Battery Sense Input Current Regulation Voltage @25°C, R1 = 100 kΩ, R2 = 50 kΩ Proportional Control – High Voltage Threshold Ratio VHigh Voltage@LampOn VRegulation@50%Duty Cycle High Voltage Hysteresis – PACKAGE PIN DESCRIPTION PACKAGE PIN # SO–14 PIN SYMBOL 1 Driver Output driver for external power switch. 2 GND Ground. 3, 6, 7, 9, 13 NC 4 OSC Timing capacitor for oscillator. 5 Lamp Base driver for lamp driver indicates no stator signal or overvoltage condition. 8 IGN 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. FUNCTION No Connection. Switched ignition power up. TYPICAL PERFORMANCE CHARACTERISTICS 15.5 Battery Voltage 15 14.5 14 13.5 13 –40 –20 0 20 40 60 Temperature (°C) 80 100 120 Figure 2. CS3361 Battery Voltage vs. Temperature (°C) Over Process Variation http://onsemi.com 4 CS3361 APPLICATIONS INFORMATION 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. The CS3361 is designed for use in an alternator charging system. 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. 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 A Regulator STATOR Winding I S Lamp Indicator IGNITION SWITCH FIELD GND FIELD Winding Figure 3. IAR System Block Diagram http://onsemi.com 5 BATT CS3361 REGULATION WAVEFORMS Figure 4 shows typical steady–state operation. A 50% duty cycle is maintained. Figure 5 shows the effect of a drop in voltage on (VBAT/N + VOSC). Notice the duty cycle increase to the field drive. Figure 6 shows the effect of an increase in voltage (above the regulation voltage) on (VBAT/N + VOSC). Notice the decrease in field drive. The CS3361 utilizes proportion control to maintain regulation. Waveforms depicting operation are shown in Figures 4, 5 and 6, where VBAT/N is the divided down voltage present on the Sense pin using R1 and R2 (Figure 7). A sawtooth waveform is generated internally. The amplitude of this waveform is listed in the electric parameter section as proportion control. The oscillator voltage is summed with VBAT/N, and compared with the internal voltage regulator (VREG) in the regulation comparator which controls the field through the output “Device Driver.” VBAT/N + VOSC VREG VBAT/N + VOSC VREG ÌÌ ÌÌ VBAT/N + VOSC VREG ÌÌÌ ÌÌÌ Field Driver On ÌÌ ÌÌ Field Driver On Figure 4. 50% Duty Cycle, Steady State Field Driver On Figure 5. > 50% Duty Cycle, Increased Load Figure 6. < 50% Duty Cycle, Decreased Load RECTIFIER MR2502 MR2502 MR2502 MR2502 MR2502 MR2502 STATOR S 250 Ω R3 C1 0.1 µF *C2 10 µF R1 100 kΩ C3 0.047 µF VCC Sense R2 50 kΩ A R4 18 kΩ STATOR D1 MR2502 R5 SC 10 kΩ Driver OSC F Logic level Q1 N Channel MTB20N20E FIELD IGN C4 0.022 µF R7 10 Ω LAMP GND POWER GROUND R6 20 kΩ R9 2.4 kΩ I Lamp Indicator R10 510 Ω IGNITION SWITCH BATTERY MPSA13 *Note: C2 optional for reduced jitter. Figure 7. Typical Application DIagram http://onsemi.com 6 CS3361 PACKAGE DIMENSIONS SO–14 D SUFFIX CASE 751A–03 ISSUE F NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. –A– 14 8 –B– 1 P 7 PL 0.25 (0.010) 7 G M B M –T– SEATING PLANE D 14 PL 0.25 (0.010) M T B J M K S A DIM A B C D F G J K M P R F R X 45 C S PACKAGE THERMAL DATA Parameter SO–14 Unit RΘJC Typical 30 °C/W RΘJA Typical 125 °C/W http://onsemi.com 7 MILLIMETERS MIN MAX 8.55 8.75 3.80 4.00 1.35 1.75 0.35 0.49 0.40 1.25 1.27 BSC 0.19 0.25 0.10 0.25 0 7 5.80 6.20 0.25 0.50 INCHES MIN MAX 0.337 0.344 0.150 0.157 0.054 0.068 0.014 0.019 0.016 0.049 0.050 BSC 0.008 0.009 0.004 0.009 0 7 0.228 0.244 0.010 0.019 CS3361 ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). 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