Datasheet CS387H, CS386H, CS3351YDR14, CS3351YD14, CS3341YDR14 Datasheet (Cherry Semiconductor)

1

Features

■ Drives NPN Darlington

■ Short Circuit Protection

■ 80V Load Dump

■ Temperature Compensated

Regulation Voltage

■ Shorted Field Protection

Duty Cycle, Self Clearing

Package Options

CS3341/3351/386/387

Alternator Voltage Regulator

Darlington Driver

CS3341/51
CS386/387

Description

The CS3341/3351/386/387 integral
alternator regulator integrated cir­cuit provides the voltage regulation
for automotive, 3-phase 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 CS386
and CS387 are available as Flip Chips.

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

Flip Chip

CS3341/51

CS386/387

A Company

®

Rev. 4/15/99

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

+

–

+
–

VREG

+
–

VHV

R

RS Flop

Set

Dominate

VSUP

OSC

Lamp

Indicator

S

Q

R

VSUP

OSC

Device
Driver

Gnd

STATOR

Power Up

STATOR

Timer

DELAY

ENABLE

SC

Note:
CS-3341/CS-387 Disconnected
CS-3351/CS-386 Connected

STATOR

2

Electrical Characteristics: CS3341/51: -40°C < TA< 125°C; -40°C < TJ< 150°C, 9V ≤ VCC≤ 17V;

unless otherwise specified

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

CS3341/3351/386/387

■ Supply

Supply Current Enabled – 12 25 mA
Supply Current Disabled – 50 µA

■ Driver Stage

Device Driver – – –
Output High Current VDD= 1.2V -10 -6 -4 mA
Output Low Voltage IOL= 25µA – 0.35 V
Minimum ON Time 200 µs
Minimum Duty Cycle – 6 10 %
Short Circuit Duty Cycle 1 5 %
Field Switch Turn On

Rise Time 30 90 µs
Fall Time 30 90 µs

■ Stator

Input High Voltage 10 V
Input Low Voltage – 6 V
Stator Time Out High to Low 6 100 600 ms
Stator Power-Up Input High CS3351/386 only 10 – V
Stator Power-Up Input Low CS3351/386 only – 6 V

■ 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

= 0.22µF 65 325 Hz

Rise Time/Fall Time C

OSC

= 0.22µF 17 – –

Oscillator High Threshold C

OSC

= 0.22µF – 6 V

■ Battery Sense

Input Current -10 +10 µA
Regulation Voltage @25°C, R1= 100kΩ, R2= 50kΩ 13.5 16.0 V
Proportional Control 0.050 0.400 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

CS3341/3351/386/387

Package Pin Description

PACKAGE PIN # PIN SYMBOL FUNCTION

14L SO Flip Chip

1 1 Driver Output driver for external power switch-Darlington.

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 over-

voltage 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

CS3341/3351 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

CS3341/3351/386/387

Application Information

Figure 2. Typical Application Diagram

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 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 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. 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.

Figure 1. IAR System Block Diagram

A

S

STATOR

Winding

FIELD Winding

FIELD

Regulator

Gnd

I

Lamp

Indicator

IGNITION

SWITCH

BATTERY

RECTIFIER

C3

.047µF

Power
Darlington

R1

100kΩ

0.022µF

R7

STATOR

S

A

R3

250Ω

18kΩ

C2

*

10µF

50kΩ

R2

C4

10Ω

C1

0.1µF

R4

R9

2.4kΩ

STATOR

LAMP

SC

Driver

Gnd

V

CC

Sense

OSC

IGN

R6

20kΩ

Note: C2 optional for reduced jitter.

*

R5

10kΩ

D1

Q1

Power Darlington

POWER GROUND

F

FIELD

Lamp

I

Indicator

R10

510Ω

IGNITION
SWITCH

BATTERY

5

CS3341/3351/386/387

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

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)

6

CS3341/3351/386/387

Rev. 4/15/99

Ordering Information

Part Number Description

CS3341YD14 14L SO
CS3341YDR14 14L SO (tape & reel)
CS3351YD14 14L SO
CS3351YDR14 14L SO (tape & reel)
CS386H Flip Chip
CS387H Flip Chip

Package Specification: continued

Solder Bump Locations, Bump Side Up

IGN

DD

SC

CS386/387

Flip Chip

1.96mm

506µm

510µm

488µm

506µm

594µm

506µm

Lamp

OSC

NC

Gnd

742µm

762µm

VCC

Sense

Stator

1000µm

605µm

2.07mm

Flip Chip

© 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.