Features
Device
Driver
Gnd
Sense
VCC
OSC
IGN
ENABLE
Series
Regulator
VSUP
LAMP
VREG
Lamp
Indicator
OSC
VHV
+
RS Flop
Set
Dominate
S
R
Q
R
ENABLE
STATOR
Power Up
STATOR
Timer
VSUP
Load Dump
Detection and
Protection
+
DELAY
SC
STATOR
+
VSUP
s
Drives Logic Level Power
NFET
s
80V Load Dump
s
Temperature Compensated
Regulation Voltage
s
Shorted Field Protection
Duty Cycle, Self Clearing
Package Options
CS3361
Alternator Voltage Regulator
FET Driver
CS3361
Description
The CS3361 integral alternator reg-
ulator integrated circuit provides
the voltage regulation for automo-
tive, 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 tran-
sistor capable of switching on a
fault indicator lamp. An overvolt-
age or no Stator signal condition
activates the lamp output.
The CS3361 is available in a 14 lead
SO package.
Block Diagram
Absolute Maximum Ratings
Storage Temperature Range .....................................................-55C to +165C
Junction Temperature Range ....................................................-40C to +150C
Continuous Supply..........................................................................................27V
I
CC
Load Dump .........................................................................................400 mA
Lead Temperature Soldering
Reflow (SMD styles only)............60 sec. max above 183C, 230C peak
1
DD
Gnd
NC
OSC
Lamp
NC
NC
SC
NC
V
CC
Sense
IGN
STATOR
NC
14 Lead SO
1
A Company
Rev. 1/29/99
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
2
Electrical Characteristics: -40C < T
A
< 125C, -40C < T
J
< 150C, 9V V
CC
17V; unless otherwise specified.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
CS3361
s
Supply
Supply Current Enabled
10
mA
Supply Current Disabled
50
A
s
Driver Stage
Output High Voltage
5.5
12
V
Output High Current
V
DD
= 1.2V
-10
-6
-4
mA
Output Low Voltage
I
OL
= 25A
0.35
V
Minimum ON Time
C
OSC
= 0.022F
200
s
Minimum Duty Cycle
6
10
%
Short Circuit Duty Cycle
1
5
%
Field Switch Turn On
Rise Time
15
75
s
Fall Time
15
75
s
s
Stator
Input High Voltage
10
V
Input Low Voltage
6
V
Stator Time Out
High to Low
6
100
600
ms
s
Lamp
Output High Current
V
LAMP
@ 3V
50
A
Output Low Voltage
I
LAMP
@ 30mA
0.35
V
s
Ignition
Input High Voltage
I
CC
> 1mA
1.8
V
Input Low Voltage
I
CC
< 100A
0.5
V
s
Oscillator
Oscillator Frequency
C
OSC
= 0.022F
90
210
Hz
Rise Time/Fall Time
C
OSC
= 0.022F
17
Oscillator High Threshold
C
OSC
= 0.022F
4.5
V
s
Battery Sense
Input Current
-10
+10
A
Regulation Voltage
@25C, R
1
= 100k, R
2
= 50k
13.8
15.8
V
Proportional Control
0.10
0.25
V
High Voltage
V
High Voltage
@ Lamp On
1.083
1.190
Threshold Ratio
V
Regulation
@ 50% Duty Cycle
High Voltage Hysteresis
0.020
0.600
V
3
CS3361
Package Pin Description
PACKAGE PIN #
PIN SYMBOL
FUNCTION
14 Lead SO
1
Driver
Output driver for external power switch.
2
Gnd
Ground.
3, 6, 7, 9, 13
NC
No connection.
4
OSC
Timing capacitor for oscillator.
5
Lamp
Base driver for lamp driver indicates no stator signal or over-
voltage condition.
8
IGN
Switched ignition power up.
10
Stator
Stator signal input for stator timer.
11
Sense
Battery sense voltage regulator comparator input and protection.
12
V
CC
Supply for IC.
14
SC
Short circuit sensing.
Typical Performance Characteristics
15.5
15
14.5
14
13.5
13
Battery V
oltage
Temperature (
C)
-
40
-
20
0
20
40
60
80
100
120
CS3361 Battery Voltage vs Temperature (C)
Over Process Variation
4
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 cur-
rent 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.
Figure 1. IAR System Block Diagram
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 current. A
high voltage results in a short duty cycle.
The ignition Terminal (I) switches power to the IC through
the V
CC
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 detect-
ed 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.
BATTERY
Lamp
Indicator
IGNITION
SWITCH
Regulator
I
Gnd
FIELD
A
S
FIELD Winding
STATOR
Winding
Figure 2. Typical Application Diagram
R2
10k
SC
Driver
Gnd
STATOR
Sense
V
CC
OSC
IGN
20k
C4
0.022
F
50k
C3
.047
F
100k
250
C1
0.1
F
18k
BATTERY
LAMP
2.4k
10
Power
Darlington
Lamp
Indicator
IGNITION
SWITCH
POWER
GROUND
Logic level N
channel
enhancement
power FET
FIELD
R5
R4
R3
R1
R6
R9
R7
R10
510
STATOR
RECTIFIER
A
F
I
S
D1
Q1
*
C2
10
F
*
Note: C2 optional for reduced jitter.
CS3361
5
Rev. 1/29/99
Ordering Information
Part Number
Description
CS3361YD14
14L SO
CS3361YDR14
14L SO (tape & reel)
Package Specification
Thermal Data
14L SO
R
JC
typ
30
C/W
R
JA
typ
125
C/W
D
Lead Count
Metric
English
Max
Min
Max
Min
14L SO
8.75
8.55
.344
.337
PACKAGE DIMENSIONS IN mm (INCHES)
PACKAGE THERMAL DATA
1999 Cherry Semiconductor Corporation
Cherry Semiconductor Corporation reserves the right to
make changes to the specifications without notice. Please
contact Cherry Semiconductor Corporation for the latest
available information.
Surface Mount Narrow Body (D); 150 mil wide
1.27 (.050) BSC
0.51 (.020)
0.33 (.013)
6.20 (.244)
5.80 (.228)
4.00 (.157)
3.80 (.150)
1.57 (.062)
1.37 (.054)
D
0.25 (0.10)
0.10 (.004)
1.75 (.069) MAX
1.27 (.050)
0.40 (.016)
REF: JEDEC MS-012
0.25 (.010)
0.19 (.008)
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