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CS3341/3351/386/387
CS3341/51 CS386/387
Alternator Voltage Regulator Darlington Driver
Description
The CS3341/3351/386/387 integral alternator regulator integrated circuit provides the voltage regulation for automotive, 3-phase alternators. 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 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 CS3341 and CS3351 are available in SO14 packages. The CS386 and CS387 are available as Flip Chips.
Features
s Drives NPN Darlington s Short Circuit Protection 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
Package Options
CS3341/51 14 Lead SO
Block Diagram
VCC Load Dump Detection and Protection VSUP
DD Gnd NC OSC Lamp NC
OSC VSUP OSC
1
SC NC VCC Sense STATOR NC IGN
CS386/387
IGN
ENABLE Series Regulator
NC
Sense
-
+
+ - VREG + - VHV
R
RS Flop Set Dominate Q
Lamp Indicator S R Device Driver
Flip Chip
DELAY
ENABLE STATOR Power Up LAMP STATOR Timer VSUP Gnd
SC
Note: CS-3341/CS-387 Disconnected CS-3351/CS-386 Connected
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. 4/15/99
1
A
(R)
Company
CS3341/3351/386/387
Electrical Characteristics: CS3341/51: -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 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 s Stator Input High Voltage Input Low Voltage Stator Time Out Stator Power-Up Input High Stator Power-Up Input Low 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
- -
12
25 50
mA A
VDD = 1.2V IOL = 25A
- -10 - 200 - 1 30 30
-6
- -4 0.35 10 5 90 90
6
- mA V s % % s s
High to Low CS3351/386 only CS3351/386 only
10 - 6 10 -
100
6 600 - 6
V V ms V V
VLAMP @ 3V ILAMP @ 30mA
- -
50 0.35
A V
ICC > 1mA ICC < 100A
1.8 -
- 0.5
V V
COSC = 0.22F COSC = 0.22F COSC = 0.22F
65 17 -
325 - 6
Hz - V
@25C, R1 = 100k, R2 = 50k VHigh Voltage @ Lamp On VRegulation @ 50% Duty Cycle
-10 13.5 0.050 1.083 0.020
+10 16.0 0.400 1.190 0.600
A V V
V
2
CS3341/3351/386/387
Package Pin Description
PACKAGE PIN # PIN SYMBOL FUNCTION
14L SO 1 2 3, 6, 7, 9, 13 4 5 8 10 11 12 14
Flip Chip 1 2 3 4 5 6 7 8 9 10 Driver Gnd NC OSC Lamp IGN Stator Sense VCC SC Output driver for external power switch-Darlington. 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 (CS3351 also power up). Battery sense voltage regulator comparator input and protection. Supply for IC. Short circuit sensing.
Typical Performance Characteristics
CS3341/3351 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
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. 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. 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. 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
C3 .047F Driver Q1 Power Darlington LAMP Gnd FIELD R2 50k OSC IGN C4 0.022F R6 20k R9 2.4k R10 510
POWER GROUND
I
Lamp Indicator
R7
10
IGNITION SWITCH
Power Darlington
BATTERY
*Note: C2 optional for reduced jitter.
Figure 2. Typical Application Diagram
4
CS3341/3351/386/387
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)
5
CS3341/3351/386/387
Package Specification: continued
Flip Chip
DD 488m Gnd 506m
SC 510m VCC 605m Sense 2.07mm Stator
(c) 1999 Cherry Semiconductor Corporation
506m NC 506m OSC 594m Lamp 762m IGN 1.96mm 742m
Solder Bump Locations, Bump Side Up
Ordering Information
Part Number CS3341YD14 CS3341YDR14 CS3351YD14 CS3351YDR14 CS386H CS387H
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
Rev. 4/15/99
1000m
CS386/387 Flip Chip

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