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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 .....................................................-55C to +165C Junction Temperature Range ....................................................-40C to +150C Continuous Supply..........................................................................................27V ICC Load Dump .........................................................................................400 mA Lead Temperature Soldering Reflow (SMD styles only)............60 sec. max above 183C, 230C 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
(R)
Company
CS3361
Electrical Characteristics: -40C < TA < 125C, -40C < TJ < 150C, 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 A
5.5 VDD = 1.2V IOL = 25A COSC = 0.022F -10 - 200 - 1 15 15 -6
12 -4 0.35 10 5 75 75
V mA V s % % s s
6
High to Low
10 - 6
100
6 600
V V ms
VLAMP @ 3V ILAMP @ 30mA
- -
50 0.35
A V
ICC > 1mA ICC < 100A
1.8 -
- 0.5
V V
COSC = 0.022F COSC = 0.022F COSC = 0.022F
90 17 -
210 - 4.5
Hz - V
@25C, R1 = 100k, R2 = 50k 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
A 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 250 R1 100k
*C2 10F
VCC Sense
C1 0.1F
18k R4 SC R5 10k
D1
STATOR
F
Q1 Logic level N channel enhancement power FET POWER GROUND Lamp Indicator
C3 .047F
Driver
R2
50k
OSC IGN LAMP Gnd
FIELD
C4 0.022F
R6 20k R9 2.4k
I
R7
10
R10 510
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 RJC typ RJA 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
(c) 1999 Cherry Semiconductor Corporation

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