CS3341/3351/386/387 CS3341/51 CS386/387 Alternator Voltage Regulator Darlington Driver Features Description The CS3341/3351/386/387 integral alternator regulator integrated circuit provides the voltage regulation for automotive, 3-phase alternators. 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. It drives an external power Darlington for control of the alternator field current. In the event of a charge fault, a lamp output pin is The CS3341 and CS3351 are available in SO14 packages. The CS386 and CS387 are available as Flip Chips. ■ Drives NPN Darlington ■ Short Circuit Protection ■ 80V Load Dump ■ Temperature Compensated Regulation Voltage ■ 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 Package Options CS3341/51 14 Lead SO DD Block Diagram VCC Load Dump Detection and Protection ENABLE Series Regulator IGN OSC VSUP – + – R Lamp Indicator RS Flop Set Dominate Q VREG NC NC VCC Sense Lamp OSC Sense Gnd OSC VSUP + SC 1 NC IGN CS386/387 S Device Driver R + – NC STATOR NC Flip Chip DELAY VHV ENABLE STATOR Power Up LAMP STATOR Timer SC Note: CS-3341/CS-387 Disconnected CS-3351/CS-386 Connected 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. 4/15/99 1 A ® Company CS3341/3351/386/387 Electrical Characteristics: CS3341/51: -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 Device Driver 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 MAX UNIT 25 50 mA µA – -4 0.35 10 5 – mA V µs % % 30 30 90 90 µs µs 6 600 – 6 V V ms V V – – – -10 – 200 – 1 VDD = 1.2V IOL = 25µA TYP 12 -6 6 ■ Stator Input High Voltage Input Low Voltage Stator Time Out Stator Power-Up Input High Stator Power-Up Input Low High to Low CS3351/386 only CS3351/386 only 10 – 6 10 – ■ Lamp Output High Current Output Low Voltage VLAMP @ 3V ILAMP @ 30mA – – 50 0.35 µA V ■ Ignition Input High Voltage Input Low Voltage ICC > 1mA ICC < 100µA 1.8 – – 0.5 V V ■ Oscillator Oscillator Frequency Rise Time/Fall Time Oscillator High Threshold COSC = 0.22µF COSC = 0.22µF COSC = 0.22µF 65 – 325 – 6 Hz – V -10 13.5 0.050 1.083 +10 16.0 0.400 1.190 µA V V 0.020 0.600 V ■ Battery Sense Input Current Regulation Voltage Proportional Control High Voltage Threshold Ratio High Voltage Hysteresis 100 17 @25°C, R1 = 100kΩ, R2 = 50kΩ VHigh Voltage @ Lamp On VRegulation @ 50% Duty Cycle 2 PACKAGE PIN # PIN SYMBOL FUNCTION 14L SO Flip Chip 1 1 Driver Output driver for external power switch-Darlington. 2 2 Gnd Ground. 3, 6, 7, 9, 13 3 NC No connection. 4 4 OSC Timing capacitor for oscillator. 5 5 Lamp Base driver for lamp driver indicates no stator signal or overvoltage condition. 8 6 IGN Switched ignition power up. 10 7 Stator Stator signal input for stator timer (CS3351 also power up). 11 8 Sense Battery sense voltage regulator comparator input and protection. 12 9 VCC Supply for IC. 14 10 SC Short circuit sensing. Typical Performance Characteristics CS3341/3351 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 CS3341/3351/386/387 Package Pin Description CS3341/3351/386/387 Application Information The CS3341 and CS3351 IC's are designed for use in an alternator charging system. The circuit is also available in flip-chip form as the CS387 and CS386. 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. 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 The ignition Terminal (I) switches power to the IC through the VCC pin. In the CS3351/CS386, the Stator pin senses the voltage from the stator. This will keep the device powered while the voltage is high, and it also senses a stopped engine condition and 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. A Lamp Indicator Regulator I S STATOR Winding IGNITION SWITCH FIELD Gnd BATTERY 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. 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 10kΩ F Sense C3 .047µF R2 Driver 50kΩ Q1 Power Darlington OSC IGN C4 0.022µF R7 10Ω LAMP FIELD Gnd R6 20kΩ POWER GROUND 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 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 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 5 0.25 (0.10) 0.10 (.004) ˚C/W ˚C/W CS3341/3351/386/387 Package Specification CS3341/3351/386/387 Package Specification: continued Flip Chip DD 488µm SC 506µm 510µm VCC 506µm 605µm Gnd NC OSC 1000µm 506µm CS386/387 Flip Chip 2.07mm Sense 594µm Lamp Stator 742µm 762µm IGN 1.96mm Solder Bump Locations, Bump Side Up Ordering Information Part Number CS3341YD14 CS3341YDR14 CS3351YD14 CS3351YDR14 CS386H CS387H Rev. 4/15/99 Description 14L SO 14L SO (tape & reel) 14L SO 14L SO (tape & reel) Flip Chip Flip Chip Cherry Semiconductor Corporation reserves the right to make changes to the specifications without notice. Please contact Cherry Semiconductor Corporation for the latest available information. 6 © 1999 Cherry Semiconductor Corporation