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. This IC has customized current sense circuitry enabling it to drive FET transistors. The CS3361 is available in an SOIC−14 package. www.onsemi.com SOIC−14 D SUFFIX CASE 751A 14 1 Features Drives Logic Level Power NFET 80 V Load Dump Temperature Compensated Regulation Voltage Shorted Field Protection Duty Cycle, Self Clearing This is a Pb−Free Device PIN CONNECTIONS AND MARKING DIAGRAM 1 DD GND NC OSC Lamp NC NC A WL YY WW G 14 CS3361G AWLYWW • • • • • SC NC VCC Sense STATOR NC IGN = Assembly Location = Wafer Lot = Year = Work Week = Pb−Free Package ORDERING INFORMATION Device Package Shipping† CS3361YDR14G SOIC−14 (Pb−Free) 2500 / Tape & Reel †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D. © Semiconductor Components Industries, LLC, 2015 March, 2015 − Rev. 11 1 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 High Voltage Comparator S Lamp Indicator Device Driver R DELAY + − SC VHV ENABLE LAMP STATOR Timer VSUP GND Figure 1. Block Diagram www.onsemi.com 2 STATOR CS3361 PACKAGE PIN DESCRIPTION PIN NO. PIN SYMBOL FUNCTION 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. No Connection. Switched ignition power up. 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 260 peak °C Lead Temperature Soldering: Reflow: (SMD styles only) (Note 1) Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. 1. 60 second maximum above 183°C. PACKAGE THERMAL DATA SO−14 Unit RΘJC Typical 30 °C/W RΘJA Typical 125 °C/W Parameter www.onsemi.com 3 CS3361 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 −10 − +10 μA 13.8 − 15.8 V 0.10 − 0.25 V 1.083 − 1.190 V/V 0.020 − 0.600 V Oscillator Battery Sense Input Current Regulation Voltage Proportional Control High Voltage Threshold Ratio High Voltage Hysteresis − @25°C, R1 = 100 kΩ, R2 = 50 kΩ − VHigh Voltage@LampOn VRegulation@50%Duty Cycle − Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be indicated by the Electrical Characteristics if operated under different conditions. www.onsemi.com 4 CS3361 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 www.onsemi.com 5 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 www.onsemi.com 6 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 ÌÌ ÌÌ 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 www.onsemi.com 7 CS3361 PACKAGE DIMENSIONS SOIC−14 NB CASE 751A−03 ISSUE K D A B 14 NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. CONTROLLING DIMENSION: MILLIMETERS. 3. DIMENSION b DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE PROTRUSION SHALL BE 0.13 TOTAL IN EXCESS OF AT MAXIMUM MATERIAL CONDITION. 4. DIMENSIONS D AND E DO NOT INCLUDE MOLD PROTRUSIONS. 5. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE. 8 A3 E H L 1 0.25 M DETAIL A 7 B 13X M b 0.25 M C A S B S X 45 _ M A1 e DETAIL A h A C SEATING PLANE DIM A A1 A3 b D E e H h L M MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.19 0.25 0.35 0.49 8.55 8.75 3.80 4.00 1.27 BSC 5.80 6.20 0.25 0.50 0.40 1.25 0_ 7_ INCHES MIN MAX 0.054 0.068 0.004 0.010 0.008 0.010 0.014 0.019 0.337 0.344 0.150 0.157 0.050 BSC 0.228 0.244 0.010 0.019 0.016 0.049 0_ 7_ SOLDERING FOOTPRINT* 6.50 14X 1.18 1 1.27 PITCH 14X 0.58 DIMENSIONS: MILLIMETERS *For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. 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