Datasheet CS3361YDR14, CS3361YD14 Datasheet (Cherry Semiconductor)

Features

■ Drives Logic Level Power

NFET

■ 80V Load Dump

■ Temperature Compensated

Regulation Voltage

■ Shorted Field Protection

Duty Cycle, Self Clearing

Package Options

CS3361

Alternator Voltage Regulator

FET Driver

CS3361

Description

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.

The CS3361 is available in a 14 lead
SO package.

Block Diagram

Absolute Maximum Ratings

Storage Temperature Range .....................................................-55°C to +165°C

Junction Temperature Range....................................................-40°C to +150°C

Continuous Supply..........................................................................................27V

I

CC

Load Dump .........................................................................................400 mA

Lead Temperature Soldering

Reflow (SMD styles only)............60 sec. max above 183°C, 230°C peak

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: [phone] Fax: [phone]

Email: [e-mail]

Web Site: www.cherry-semi.com

V

CC

ENABLE

IGN

Series

Regulator

Load Dump

Detection and

VSUP

Protection

1

Sense

LAMP

OSC

Lamp

Gnd

R

S

Indicator

STATOR

Power Up

STATOR

Timer

DELAY

+

–

+
–

VREG

+
–

VHV

R

RS Flop

Set

Dominate

VSUP

Q

VSUP

ENABLE

OSC

Device
Driver

SC

STATOR

2

Electrical Characteristics: -40°C < TA< 125°C, -40°C < TJ< 150°C, 9V ≤ VCC≤ 17V; unless otherwise specified.

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

CS3361

■ Supply

Supply Current Enabled – 10 mA
Supply Current Disabled – 50 µA

■ Driver Stage

Output High Voltage 5.5 12 V
Output High Current VDD= 1.2V -10 -6 -4 mA
Output Low Voltage IOL= 25µA – 0.35 V
Minimum ON Time C

OSC

= 0.022µF 200 µs
Minimum Duty Cycle – 6 10 %
Short Circuit Duty Cycle 1 5 %
Field Switch Turn On

Rise Time 15 75 µs
Fall Time 15 75 µs

■ Stator

Input High Voltage 10 V
Input Low Voltage – 6 V
Stator Time Out High to Low 6 100 600 ms

■ Lamp

Output High Current V

LAMP

@ 3V – 50 µA

Output Low Voltage I

LAMP

@ 30mA – 0.35 V

■ Ignition

Input High Voltage ICC> 1mA 1.8 – V
Input Low Voltage ICC< 100µA – 0.5 V

■ Oscillator

Oscillator Frequency C

OSC

= 0.022µF 90 210 Hz
Rise Time/Fall Time C

OSC

= 0.022µF 17 – –
Oscillator High Threshold C

OSC

= 0.022µF – 4.5 V

■ Battery Sense

Input Current -10 +10 µA
Regulation Voltage @25°C, R

1

= 100kΩ, R2= 50kΩ 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

CS3361 Battery Voltage vs Temperature (°C)

Over Process Variation

15.5

15

14.5

14

Battery Voltage

13.5

13

−40 −20 0 20 40 60 80 100 120

Temperature (°C)

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 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.

Figure 1. IAR System Block Diagram

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 VCCpin. 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 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 2. Typical Application Diagram

A

Lamp

Indicator

I

IGNITION

SWITCH

STATOR

Winding

FIELD Winding

FIELD

S

Regulator

Gnd

BATTERY

C3

.047µF

Power
Darlington

R1

100kΩ

0.022µF

R7

RECTIFIER

STATOR

S

A

R3

250Ω

18kΩ

IGN

CC

R6

20kΩ

R9

2.4kΩ

C1

0.1µF

STATOR

LAMP

R4

Driver

Gnd

D1

R5

SC

10kΩ

Q1

Logic level N
channel
enhancement
power FET

POWER
GROUND

F

FIELD

Lamp

Indicator

I

IGNITION
SWITCH

R10

510Ω

BATTERY

C2

*

10µF

V

Sense

50kΩ

R2

OSC

C4

10Ω

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

ΘJC

typ 30 ˚C/W

R

ΘJA

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)