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CS3341/51
CS386/387
Alternator Voltage Regulator
Darlington Driver
Description
Features
The CS3341/3351/386/387 integral
alternator regulator integrated cir-
cuit provides the voltage regulation
for automotive, 3-phase alternators.
It drives an external power
Darlington for control of the alter-
nator field current. In the event of a
charge fault, a lamp output pin is
provided to drive an external dar-
lington transistor capable of switch-
ing on a fault indicator lamp. An
overvoltage or no STATOR signal
condition activates the lamp output.
The CS3341 and CS3351 are avail-
able in SO14 packages. The CS386
and CS387 are available as Flip Chips.
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 .....................................................-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
Block Diagram
VCC
ENABLE
IGN Series
Regulator
Load Dump
Detection and
Protection
VSUP
Sense
+
LAMP
+
VREG
+
VHV
OSC
RS Flop
Set S
R Dominate
QR
Lamp
Indicator
OSC
VSUP
Device
Driver
VSUP
DELAY
SC
ENABLE
STATOR
Power Up
Note:
CS-3341/CS-387 Disconnected
CS-3351/CS-386 Connected
STATOR
Timer
STATOR
Gnd
Rev. 4/15/99
1
Package Options
CS3341/51
14 Lead SO
DD 1
SC
Gnd NC
NC VCC
OSC
Sense
Lamp
STATOR
NC NC
NC IGN
CS386/387
Flip Chip
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
A ® Company

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Electrical Characteristics: CS3341/51: -40°C < TA < 125°C; -40°C < TJ < 150°C, 9V VCC 17V;
unless otherwise specified
PARAMETER
s Supply
Supply Current Enabled
Supply Current Disabled
TEST CONDITIONS
MIN
TYP
MAX
– 12 25
– 50
UNIT
mA
µA
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
VDD = 1.2V
IOL = 25µA
-10 -6
200
–6
1
30
30
––
-4 mA
0.35 V
µs
10 %
5%
90 µs
90 µs
s 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 V
– 6V
6 100 600 ms
10 – V
– 6V
s Lamp
Output High Current
Output Low Voltage
VLAMP @ 3V
ILAMP @ 30mA
s Ignition
Input High Voltage
Input Low Voltage
ICC > 1mA
ICC < 100µA
s Oscillator
Oscillator Frequency
Rise Time/Fall Time
Oscillator High Threshold
COSC = 0.22µF
COSC = 0.22µF
COSC = 0.22µF
s Battery Sense
Input Current
Regulation Voltage
Proportional Control
High Voltage
Threshold Ratio
High Voltage Hysteresis
@25°C, R1 = 100k, R2 = 50k
VHigh Voltage @ Lamp On
VRegulation @ 50% Duty Cycle
1.8
65
17
-10
13.5
0.050
1.083
0.020
50 µA
0.35 V
–V
0.5 V
325 Hz
––
6V
+10
16.0
0.400
1.190
0.600
µA
V
V
V
2

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PACKAGE PIN #
14L SO
Flip Chip
11
22
3, 6, 7, 9, 13
3
44
55
86
10 7
11 8
12 9
14 10
Package Pin Description
PIN SYMBOL
FUNCTION
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 over-
voltage 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
14.5
14
13.5
13
40
20
0
20 40 60 80
Temperature (°C)
100 120
3

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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 cur-
rent in the Stator windings is rectified by the diodes and
applied to the regulator. By controlling the amount of field
STATOR
Winding
FIELD Winding
A
S
FIELD
Regulator
I
Lamp
Indicator
IGNITION
SWITCH
Gnd
BATTERY
Figure 1. IAR System Block Diagram
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 connect-
ed 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 cur-
rent. 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.
RECTIFIER
STATOR
S
R1
100k
*C2
10µF
R3
250
C1
0.1µF
18k
R4
VCC STATOR SC
C3
.047µF
Sense
R2 50k
OSC
Driver
C4
0.022µF
IGN
R6
20k
LAMP Gnd
R7 10
R9
2.4k
Power
Darlington
A
D1
R5 10k
Q1
Power Darlington
F
POWER GROUND
I
Figure 2. Typical Application Diagram
*Note: C2 optional for reduced jitter.
4
FIELD
Lamp
Indicator
R10
510
IGNITION
SWITCH
BATTERY

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Package Specification
PACKAGE DIMENSIONS IN mm (INCHES)
Lead Count
14L SO
Metric
Max Min
8.75 8.55
D
English
Max Min
.344 .337
PACKAGE THERMAL DATA
Thermal Data
RΘJC
RΘJA
typ
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)
0.40 (.016)
0.25 (.010)
0.19 (.008)
1.57 (.062)
1.37 (.054)
REF: JEDEC MS-012
1.27 (.050) BSC
1.75 (.069) MAX
0.25 (0.10)
0.10 (.004)
D
5