Semiconductor Components Industries, LLC, 2002
August, 2002 Rev. 11
1
Publication Order Number:
CS3341/D
CS3341, CS3351, CS387
Alternator Voltage
Regulator Darlington Driver
The CS3341/3351/387 integral alternator regulator integrated circuit
provides the voltage regulation for automotive, 3phase 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
CS387 is available as a Flip Chip.
For FET driver applications use the CS3361. Use of the CS3341,
CS3351 or CS387 with external FETs may result in oscillations.
Features
Drives NPN Darlington
Short Circuit Protection
80 V Load Dump
Temperature Compensated Regulation Voltage
Shorted Field Protection Duty Cycle, Self Clearing
x
= 4 or 5
A
= Assembly Location
WL, L
= Wafer Lot
YY, Y
= Year
WW, W
= Work Week
SO14
D SUFFIX
CASE 751A
IGN
NC
NC
NC
STATOR
Lamp
Sense
OSC
1
14
V
CC
NC
NC
GND
SC
DD
1
14
PIN CONNECTIONS
Device
Package
Shipping
ORDERING INFORMATION
CS3341YD14
SO14
55 Units/Rail
CS3341YDR14
SO14
2500 Tape & Reel
CS3351YD14
SO14
55 Units/Rail
CS3351YDR14
SO14
2500 Tape & Reel
CS387H
Flip Chip
Contact Sales
SO14
MARKING
DIAGRAM
1
CS33x1
AWLYWW
14
V
CC
Sense
Stator
IGN
GND
NC
OSC
Lamp
DD
SC
Flip Chip, Bump Side Up
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CS3341, CS3351, CS387
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2
Figure 1. Block Diagram
IGN
Sense
LAMP
V
CC
V
SUP
GND
STATOR
ENABLE
DELAY
Lamp
Indicator
S
R
Q
R
STATOR
Timer
V
HV
V
REG
+
ENABLE
Series
Regulator
Load Dump
Detection and
Protection
V
SUP
RS Flop
Set
Dominate
Power Up
STATOR
OSC
Device Driver
SC
Note:
CS3341/CS387
Disconnected
CS3351 Connected
OSC
+
+
Regulator
Comparator
High Voltage
Comparator
+
CS3341, CS3351, CS387
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3
MAXIMUM RATINGS*
Rating
Value
Unit
Storage Temperature Range, T
S
55 to +165
C
Junction Temperature Range
40 to 150
C
Continuous Supply
27
V
I
CC
Load Dump
400
mA
Lead Temperature Soldering:
Reflow: (SMD styles only) (Note 1)
230 peak
C
1. 60 second maximum above 183
C.
*The maximum package power dissipation must be observed.
ELECTRICAL CHARACTERISTICS
(40
C < T
A
< 125
C, 40
C < T
J
< 150
C, 9.0 V
V
CC
17 V; unless otherwise
specified.)
Characteristic
Test Conditions
Min
Typ
Max
Unit
Supply
Supply Current Enabled
12
25
mA
Supply Current Disabled
50
A
Driver Stage
Output High Current
V
DD
= 1.2 V
10
6.0
4.0
mA
Output Low Voltage
I
OL
= 25
A
0.35
V
Minimum ON Time
200
s
Minimum Duty Cycle
6.0
10
%
Short Circuit Duty Cycle
1.0
5.0
%
Field Switch Turn On
Rise Time
30
90
s
Field Switch Turn On
Fall Time
30
90
s
Stator
Input High Voltage
10
V
Input Low Voltage
6.0
V
Stator Time Out
High to Low
6.0
100
600
ms
Stator PowerUp Input High
CS3351 only
10
V
Stator PowerUp Input Low
CS3351 only
6.0
V
Lamp
Output High Current
V
LAMP
@
3.0 V
50
A
Output Low Voltage
I
LAMP
@ 30 mA
0.35
V
Ignition
Input High Voltage
I
CC
> 1.0 mA
1.8
V
Input Low Voltage
I
CC
< 100
A
0.5
V
Oscillator
Oscillator Frequency
C
OSC
= 0.22
F
65
325
Hz
Rise Time/Fall Time
C
OSC
= 0.22
F
17
Oscillator High Threshold
C
OSC
= 0.22
F
6.0
V
CS3341, CS3351, CS387
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4
ELECTRICAL CHARACTERISTICS (continued)
(40
C < T
A
< 125
C, 40
C < T
J
< 150
C, 9.0 V
V
CC
17 V; unless otherwise
specified.)
Characteristic
Unit
Max
Typ
Min
Test Conditions
Battery Sense
Input Current
10
+10
A
Regulation Voltage
@25
C, R
1
= 100 k
, R
2
= 50 k
13.5
16
V
Proportional Control
0.050
0.400
V
High Voltage Threshold Ratio
VHigh Voltage @ LampOn
VRegulation @ 50%Duty Cycle
1.083
1.190
High Voltage Hysteresis
0.020
0.600
V
PACKAGE PIN DESCRIPTION
PACKAGE PIN #
SO14
Flip Chip
PIN SYMBOL
FUNCTION
1
1
Driver
Output driver for external power switchDarlington.
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
V
CC
Supply for IC.
14
10
SC
Short circuit sensing.
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 2. Battery Voltage vs. Temperature (
C)
Over Process Variation
15.5
15
14.5
14
13.5
13
40
20
0
20
40
60
80
100
120
Temperature (
C)
Battery V
oltage
CS3341, CS3351, CS387
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5
APPLICATIONS INFORMATION
The CS3341 and CS3351 IC's are designed for use in an
alternator charging system. The circuit is also available in
flipchip form as the CS387.
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 V
CC
pin. In the CS3351 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.
Figure 3. IAR System Block Diagram
BATT
Ignition
Switch
Regulator
A
GND
I
S
FIELD
FIELD
Winding
STATOR
Winding
Lamp
Indicator
CS3341, CS3351, CS387
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6
REGULATION WAVEFORMS
The CS3341/3351/387 utilizes proportion control to
maintain regulation. Waveforms depicting operation are
shown in Figures 4, 5 and 6, where V
BAT/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 V
BAT/N
, and compared with the
internal voltage regulator (V
REG
) in the regulation
comparator which controls the field through the output
"Device Driver."
Figure 4 shows typical steadystate operation. A 50%
duty cycle is maintained.
Figure 5 shows the effect of a drop in voltage on (V
BAT/N
+ V
OSC
). Notice the duty cycle increase to the field drive.
Figure 6 shows the effect of an increase in voltage (above
the regulation voltage) on (V
BAT/N
+ V
OSC
). Notice the
decrease in field drive.
Figure 4. 50% Duty Cycle,
Steady State
Figure 5. > 50% Duty Cycle,
Increased Load
Figure 6. < 50% Duty Cycle,
Decreased Load
V
REG
V
BAT/N
+ V
OSC
V
REG
V
REG
V
BAT/N
+ V
OSC
Field Driver On
Field Driver On
Field Driver On
V
BAT/N
+ V
OSC
Figure 7. Typical Application DIagram
D1
C3
BATTERY
2N6284
Power
Darlington
POWER GROUND
R4
18 k
C1
0.1
F
R2
50 k
0.047
F
C4
0.022
F
R6
20 k
R9
2.4 k
GND
Driver
SC
STATOR
STATOR
RECTIFIER
S
A
F
I
FIELD
Lamp Indicator
R10
510
IGNITION
SWITCH
R7
MPSA13
or CS299
*Note: C2 optional for reduced jitter.
LAMP
V
CC
Sense
OSC
IGN
*C2
10
F
R1
100 k
R5 10 k
R3
250
10
MR2502
MR2502
MR2502
CS3341, CS3351, CS387
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7
488
m
506
m
510
m
762
m
742
m
1.96 mm
506
m
506
m
594
m
605
m
1000
m
2.07 mm
Figure 8. Flip Chip Dimensions and Solder Bump Locations, Bump Side Up
CS3341, CS3351, CS387
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8
PACKAGE DIMENSIONS
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
A
B
G
P
7 PL
14
8
7
1
M
0.25 (0.010)
B
M
S
B
M
0.25 (0.010)
A
S
T
T
F
R
X 45
SEATING
PLANE
D
14 PL
K
C
J
M
_
DIM
MIN
MAX
MIN
MAX
INCHES
MILLIMETERS
A
8.55
8.75
0.337
0.344
B
3.80
4.00
0.150
0.157
C
1.35
1.75
0.054
0.068
D
0.35
0.49
0.014
0.019
F
0.40
1.25
0.016
0.049
G
1.27 BSC
0.050 BSC
J
0.19
0.25
0.008
0.009
K
0.10
0.25
0.004
0.009
M
0
7
0
7
P
5.80
6.20
0.228
0.244
R
0.25
0.50
0.010
0.019
_
_
_
_
SO14
D SUFFIX
CASE 751A03
ISSUE F
PACKAGE THERMAL DATA
Parameter
SO14
Unit
R
JC
Typical
30
C/W
R
JA
Typical
125
C/W
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CS3341/D
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