Alternator Voltage Regulator FET Driver

CS3361
Alternator Voltage
Regulator FET Driver
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.
This IC has customized current sense circuitry enabling it to drive
FET transistors. The CS3361 is available in an SOIC−14 package.
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SOIC−14
D SUFFIX
CASE 751A
14
1
Features
Drives Logic Level Power NFET
80 V Load Dump
Temperature Compensated Regulation Voltage
Shorted Field Protection Duty Cycle, Self Clearing
This is a Pb−Free Device
PIN CONNECTIONS AND
MARKING DIAGRAM
1
DD
GND
NC
OSC
Lamp
NC
NC
A
WL
YY
WW
G
14
CS3361G
AWLYWW
•
•
•
•
•
SC
NC
VCC
Sense
STATOR
NC
IGN
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
ORDERING INFORMATION
Device
Package
Shipping†
CS3361YDR14G
SOIC−14
(Pb−Free)
2500 / Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2015
March, 2015 − Rev. 11
1
Publication Order Number:
CS3361/D
CS3361
VCC
Load Dump
Detection and
Protection
ENABLE
Series
Regulator
IGN
VSUP
OSC
OSC
VSUP
Regulator
Comparator
Sense
+
+
+
R
−
RS Flop
Set
Dominate
Q
VREG
High Voltage
Comparator
S
Lamp
Indicator
Device Driver
R
DELAY
+
−
SC
VHV
ENABLE
LAMP
STATOR
Timer
VSUP
GND
Figure 1. Block Diagram
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2
STATOR
CS3361
PACKAGE PIN DESCRIPTION
PIN NO.
PIN SYMBOL
FUNCTION
1
Driver
Output driver for external power switch.
2
GND
Ground.
3, 6, 7, 9, 13
NC
4
OSC
Timing capacitor for oscillator.
5
Lamp
Base driver for lamp driver indicates no stator signal or overvoltage condition.
8
IGN
10
Stator
Stator signal input for stator timer.
11
Sense
Battery sense voltage regulator comparator input and protection.
12
VCC
Supply for IC.
14
SC
Short circuit sensing.
No Connection.
Switched ignition power up.
MAXIMUM RATINGS
Rating
Value
Unit
Storage Temperature Range, TS
−55 to +165
°C
Junction Temperature Range
−40 to 150
°C
Continuous Supply
27
V
ICC Load Dump (@ VCC = 80 Vpeak)
400
mA
260 peak
°C
Lead Temperature Soldering:
Reflow: (SMD styles only) (Note 1)
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
1. 60 second maximum above 183°C.
PACKAGE THERMAL DATA
SO−14
Unit
RΘJC
Typical
30
°C/W
RΘJA
Typical
125
°C/W
Parameter
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3
CS3361
ELECTRICAL CHARACTERISTICS (−40°C < TA < 125°C, −40°C < TJ < 150°C, 9.0 V ≤ VCC ≤ 17 V; unless otherwise specified.)
Characteristic
Test Conditions
Min
Typ
Max
Unit
Supply Current Enabled
−
−
−
10
mA
Supply Current Disabled
−
−
−
50
μA
−
5.5
−
12
V
Supply
Driver Stage
Output High Voltage
Output Low Voltage
IOL = 25 μA
−
−
0.35
V
Output High Current
VDD = 1.2 V
−10
−6.0
−4.0
mA
Minimum ON Time
COSC = 0.022 μF
200
−
−
μs
Minimum Duty Cycle
−
−
6.0
10
%
Short Circuit Duty Cycle
−
1.0
−
5.0
%
Field Switch Turn On
Rise Time
−
15
−
75
μs
Field Switch Turn On
Fall Time
−
15
−
75
μs
Input High Voltage
−
10
−
−
V
Input Low Voltage
−
−
−
6.0
V
6.0
100
600
ms
Stator
Stator Time Out
High to Low
Lamp
Output High Current
VLAMP @ 3.0 V
−
−
50
μA
Output Low Voltage
ILAMP @ 30 mA
−
−
0.35
V
Ignition
Input High Voltage
ICC > 1.0 mA
1.8
−
−
V
Input Low Voltage
ICC < 100 μA
−
−
0.5
V
Oscillator Frequency
COSC = 0.022 μF
90
−
210
Hz
Rise Time/Fall Time
COSC = 0.022 μF
−
17
−
−
Oscillator High Threshold
COSC = 0.022 μF
−
−
4.5
V
−10
−
+10
μA
13.8
−
15.8
V
0.10
−
0.25
V
1.083
−
1.190
V/V
0.020
−
0.600
V
Oscillator
Battery Sense
Input Current
Regulation Voltage
Proportional Control
High Voltage Threshold Ratio
High Voltage Hysteresis
−
@25°C, R1 = 100 kΩ, R2 = 50 kΩ
−
VHigh [email protected]
[email protected]%Duty Cycle
−
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
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4
CS3361
TYPICAL PERFORMANCE CHARACTERISTICS
15.5
Battery Voltage
15
14.5
14
13.5
13
−40
−20
0
20
40
60
Temperature (°C)
80
100
120
Figure 2. CS3361 Battery Voltage vs. Temperature
(°C) Over Process Variation
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5
CS3361
APPLICATIONS INFORMATION
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.
The CS3361 is designed for use in an alternator charging
system.
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 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
A
Regulator
STATOR
Winding
I
S
Lamp
Indicator
IGNITION
SWITCH
FIELD
GND
FIELD
Winding
Figure 3. IAR System Block Diagram
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6
BATT
CS3361
REGULATION WAVEFORMS
Figure 4 shows typical steady−state operation. A 50%
duty cycle is maintained.
Figure 5 shows the effect of a drop in voltage on (VBAT/N
+ VOSC). Notice the duty cycle increase to the field drive.
Figure 6 shows the effect of an increase in voltage (above
the regulation voltage) on (VBAT/N + VOSC). Notice the
decrease in field drive.
The CS3361 utilizes proportion control to maintain
regulation. Waveforms depicting operation are shown in
Figures 4, 5 and 6, where VBAT/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 VBAT/N, and compared with the internal
voltage regulator (VREG) in the regulation comparator
which controls the field through the output “Device Driver.”
VBAT/N + VOSC
VREG
VBAT/N + VOSC
VREG
ÌÌ
ÌÌ
VBAT/N + VOSC
VREG
ÌÌ
ÌÌ
Field Driver On
ÌÌ
ÌÌ
Field Driver On
Figure 4. 50% Duty Cycle,
Steady State
Field Driver On
Figure 5. > 50% Duty Cycle,
Increased Load
Figure 6. < 50% Duty Cycle,
Decreased Load
RECTIFIER
MR2502
MR2502
MR2502
MR2502
MR2502
MR2502
STATOR
S
250 Ω
R3
C1
0.1 μF
*C2
10 μF
R1
100 kΩ
C3
0.047 μF
VCC
Sense
R2
50 kΩ
A
R4
18 kΩ
STATOR
D1
MR2502
R5
SC
10 kΩ
Driver
OSC
F
Logic level
Q1 N Channel
MTB20N20E
FIELD
IGN
C4
0.022 μF
R7
10 Ω
LAMP GND
POWER
GROUND
R6
20 kΩ
R9
2.4 kΩ
I
Lamp Indicator
R10
510 Ω
IGNITION
SWITCH
BATTERY
MPSA13
*Note: C2 optional for reduced jitter.
Figure 7. Typical Application DIagram
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7
CS3361
PACKAGE DIMENSIONS
SOIC−14 NB
CASE 751A−03
ISSUE K
D
A
B
14
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. DIMENSION b DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE PROTRUSION
SHALL BE 0.13 TOTAL IN EXCESS OF AT
MAXIMUM MATERIAL CONDITION.
4. DIMENSIONS D AND E DO NOT INCLUDE
MOLD PROTRUSIONS.
5. MAXIMUM MOLD PROTRUSION 0.15 PER
SIDE.
8
A3
E
H
L
1
0.25
M
DETAIL A
7
B
13X
M
b
0.25
M
C A
S
B
S
X 45 _
M
A1
e
DETAIL A
h
A
C
SEATING
PLANE
DIM
A
A1
A3
b
D
E
e
H
h
L
M
MILLIMETERS
MIN
MAX
1.35
1.75
0.10
0.25
0.19
0.25
0.35
0.49
8.55
8.75
3.80
4.00
1.27 BSC
5.80
6.20
0.25
0.50
0.40
1.25
0_
7_
INCHES
MIN
MAX
0.054 0.068
0.004 0.010
0.008 0.010
0.014 0.019
0.337 0.344
0.150 0.157
0.050 BSC
0.228 0.244
0.010 0.019
0.016 0.049
0_
7_
SOLDERING FOOTPRINT*
6.50
14X
1.18
1
1.27
PITCH
14X
0.58
DIMENSIONS: MILLIMETERS
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
ON Semiconductor and the
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC) or its subsidiaries in the United States and/or other countries.
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or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets
and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each
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For additional information, please contact your local
Sales Representative
CS3361/D