Datasheet L585 Datasheet (SGS Thomson Microelectronics)

CAR ALTERNATOR REGULATOR

.ALTERNATORVOLTAGECONTROL

.COMPLETEFAULT DIAGNOSTICS

.DRIVES3 W LAMP DIRECTLY

.LAMPSHORTCIRCUIT PROTECTION

.SENSINGINTERRUPT PROTECTION

.100V DUMPPROTECTION

.300V LOW ENERGY SPIKEPROTECTION

.THERMALPROTECTION

DESCRIPTION

The L585 is an integratedcircuit designedfor use
with an NPN darlingtonas a voltage regulatorin a
threephasealternator charging system. It includes
faultdiagnosticcircuitrywhichdrivesa3Wwarning
lampinfaultconditionssuchasopenor shortcircuit
connections. Protection against load dump tran­sients,shortcircuits andlowenergyspikesisincor­porated.

L585

DIP16

SO16

ORDERING NUMBERS : L585(DIP16)

L585D1 (SO16)

BLOCK DIAGRAM

November 1991

1/9

L585

PI N CONNECTI ON

(*) MUST BE LEFT FLOATING

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V
V
T

P

T

stg

T

Operating supply Voltage (through RS)28V

S

Dump Voltage 100 V

D

Junction Temperature Range – 40 to 150 °

j

Power Dissipation at T

tot

amb

=80°C

1W
Junction and Storage Temperature Range – 55 to 150 °
Operating Temperature Range – 40 to 125 °

op

C

C
C

THERMAL DATA

Symbol Parameter Value Unit

R

th j-amb

R

th j-alumina

Note : Soldered on PC board that simulatesan application with medium device density onboard.
(*) Thermalresistance junction-pins withthe chipsoldered onthe middleof an aluminasupporting substrate measuring 15 ö 20 mm ; 0.65 mm

thickness and infinite heathsink.

Thermal Resistance Junction-ambient (*) for DIP 16

(*)

Thermal Resistance Junction-alumina for SO-16

Max
Max

80
50

°C/W
°C/W

2/9

PIN FUNCTIONS

N° Name Functions

1 Alternator Voltage

Sensing

2-3 Filter Capacitor A capacitor connected between these two pins filters the feedback signal from

4 Alternator Overvoltage

Adjustment

5 GND This pin must be connected to ground.
6 Darlington Driver This pin drives the external darlington disabling it by shorting the current in R

7-8-9 N.C. These pins must be left floating.

10 IC Supply Voltage Supply Voltage Input

11 Oscillator Capacitor A capacitor connected to ground sets the frequency of the internal oscillator.

Connection for voltage regulation sensing. The regulation sensitivity is a
function of R1 and is given by :

∆VA

S=

∆ R1

= 0.5mV⁄ Ω

the regulated output. Typically the input impedance is 15KΩ.
When this pin is left open circuit the overvoltage threshold is a described in the

specification. Typically the warning lamp is switched on when the voltage at
this pin is greater than 3.5V. This threshold can be modified with a resistor
between either the ground or pin 2.

to ground.

A 7.5V (typical) Zener is present at the input.

The frequency is given by :

L585

B

−6

20 x 10

fosc =

8.4 x C

osc

12 GND This pin must be connected to ground.
13 Lamp Driver Current Driver for External Lamp for Diagnostics.

Internally protected agains short circuits (current limiting), load dump transients

and, by means of a zener, against low energy spikes.
14 NC Not connected.
15 Phase Voltage Sensing. Connection for no charge sensing from the alternator .

The internal low threshold is typically 2.4V. By means of the external divider

R3/R4 the threshold can be adjusted to give the required sensitivity.
16 Battery Voltage Sensing Connection for Voltage Battery Sensing

This pin senses a failure of the alternator-battery lead as the voltage difference

. The external resistor R2 limits the current in overvoltage protection.

V

A-VS

3/9

L585

ELECTRICALCHARACTERISTICS (Vs=14.4V;–30°C≤Tj≤100°C unlessotherwisespecified; referto

applicationcircuit)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

REGULATION

V

I

d

V

Operating Supply Voltage 6 25 V

S

Quiescent Drain Current (pin 10) V10= 5.5V 24 mA
Alternator Reg. Voltage

A

T
R
T
T

∆V

S Sensitivity to R

TC

Voltage Reg. Range 10% < d < 90%

A

Variation S = dVA/dR

1

Normalized S

nS

1/S* dS/dT – 2000

Temperature Coeff.

V

6 sat

f

s

I

1

Darlington Driver Satur. Voltage I6= 20mA 200 mV
Oscillation Frequency C
Standby Current (pin 1) V

DIAGNOSTIC

V

AH

V

PL

V

AS

V

1 3sat

V

1 3off

t

d

Notes : 1. d = 50% theduty cycle of the output signal at pin 6.

Overcharging Voltage
Threshold (2)

T
R
V
–30°C<T

Low Level Phase Voltage
Threshold (no load) (4)

Difference Between Altern. and
Supply Voltage (5)

f = 600Hz, T
–30°C<T

T

–30°C<T
Lamp Driver Saturation Voltage I13= 250mA 1.5 V
Lamp Driver Voltage without

R
Power Supply (6)

Alarm Delay C

2. The lamp is switchedon witha fixeddelay when the alternator voltage becomes higherthan V

3. Measured 100ms after turn-on.

4. The lamp isswitched on with a fixed delay when the voltageV

5. The lamp is switchedon when thecable B isbroken (V

6. The lamp is switchedon when thecable A isbroken (IC withoutpower voltage supply).

7. When the voltageat pin 1 is greater thanV

the internal darlington of the lamp is switched off.

1dp

=20°C, t = 100ms

j

= 1.3KΩ (1)

1

=–30°C

j

= + 100°C

j

14.26

14.60

13.32

14.55 14.84

15.50

14.17

± 60

1

= 20nF 80 170 Hz

osc

= 12V 2 mA

batt

=25°C

j

= 1.3KΩ

1

S=VAH

j

S

osc

(3)

< + 100°C

j

=25°C

j

< + 100°C

j

=25°C

< + 100°C

j

>48Ω 4.5 V

= 20nF 70 1.50 s

becomes lower than VPL(thealternator is not charging the battery).

p

becomes higher than VAS).

A-VS

0.35 0.65

1.054V

1.049V
5

4.5

2.33

2.00

A

A

3.10

3.31

. (overcharge indication).

AH

1.086V

1.091V

6
6

A

A

7

7.5

3.88

4.18

V
V

V

mV

mV/Ω

ppm/°C

V

V
V

V
V

V

4/9

ELECTRICALCHARACTERISTICS (continued)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

PROTECTION

L585

T

V

Zen

V

1dp

I

13sc

I

dump

V

Z13

Notes : 1. d = 50 % theduty cycle of the output signal at pin6.

Darlingtyon Thermal Shutdown

sh

Threshold
(pin 10) Zener Voltage IO= 60mA

= 130mA

I

O

Overvoltage Protection
Threshold (7)

Lamp Driver Circuit Current 300 1500 mA
Pin 13 Dump Sustaining Capapility

Current
Zener Clamping Voltage I13= 100mA@

2. The lamp is switched on with afixed delay when thealternator voltage becomes higherthan V

3. Measured100 ms afterturn-on.

4. The lamp is switchedon with a fixeddelay when the voltage V

5. The lamp is switched on when the cable B isbroken (V

6. The lamp is switched on when the cable A isbroken (IC without powervoltage supply).

7. When the voltage at pin 1 is greater than V

=25°C

T

j

–30°C<T

V1 3 = 110V@ T

= 50V@ t = 100ms

V

1

t = < 3ms

= 40mA@

I

13

t = < 6ms, full T

= -30°C

T

J

theinternal darlington of the lamp is switched off.

1dp

< + 100°C

j

=25°C

j

becomes lower than VPL(thealternatoris notcharging the battery).

p

becomes higher than VAS).

A-VS

150 °

6

6.2
25

23

110 V

100

90

32 38

. (overcharge indication).

AH

8

8.2

40

200 mA

CIRCUI T OPE RATION

TheL585alternatorregulator performstwo main functions : regulationcontroland fault diagnostics.

C

V
V

V
V

V
V

REGULATI ON

Thealternatorvoltageis comparedwitha reference
voltagein anerroramplifier(seeblockdiagram),the
outputof whichdeterminesthedutycycleof theex­ternaldarlington.This darlingtonswitches the cur­rentin the excitationcoil of the alternator.

Theswitchingfrequencyisfixedandissetbytheex­ternalcapacitorC

(seeapplicationcircuit). Ca-

OSC

DIAGNO ST IC

Thiscircuitreceivesinformationfromthebattery,the
alternator and one alternator phase. It indicates
anomolousconditionsbydrivinga3Wlamp.Topre­vent spurious fault warnings some indications are
notdisplayedimmediatelybutaredelayedbya fixed
time.No externalcomponentsare neededto imple­mentthisdelay sinceit is producedinternallyby di­vidingthe internaloscillator with an eight-stagedi­viderto givea delayof 128 periods.For a onesec­onddelaytheoscillatorfrequencymustbe128Hz.

pacitivepositivefeedbackand a monostableelimi­natesspuriousswitchingcausedbycontactbounce.
Thebasecurrentdeliveredtotheexternaldarlington
it setby the resistorR

(seeapplicationcircuit)and

B

must be dimensioned according to the charac­teristicsof thisdarlingtonandthemaximum coilcur­rent.

Thelamp is drivenafter a delay whenthe following
conditionsoccur : no charge, break or short circuit
in the alternatorsensewire.

Thediagnosticlamp isdrivenimmediatelywhenthe
cableconnectingthealternatortothebatteryisbro­ken(Va-Vbattabove2.6typ.)orwhentheICiswith­out powersupply(V

ofthe lampdriveris2.4V

CE sat

typ.in this case).

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L585

PROTECTION

SHORT CIRCUIT PROTECTION
Theintegrateddarlingtonis protectedagainstshort

circuits of thelamp. The short circuit currentis lim­itedat 600mAandifthisconditionpersistesthermal
protectionwillintervene.

DUMPPROTECTION
Thewhole IC is protectedagainst load dumptran-

sients(100 V, 300ms with a risetimegreater than
5ms)inthetypicalapplicationcircuit.Theonlycom­ponenttowhich thistransientisdirectlyapplied(no

Figure 1 : ApplicationCircuit.

series resistances) is the lamp driver darlington.
Duringtransientsthedarlingtonis kept off and can
withstandpeak voltagesof 100 V. Additionally,the
IC can withstand low energy spikes up to 300 V.
These spikes are clamped by an internal 100 V
zeneron thecollector of the lamp driverdarlington.

THERMAL PROTECTION
Whenthe IC temperaturereaches170 °C thelamp

driverdarlingtonis keptoff.

The deviceisabletowithstandall the voltagetran­sientsmentionedin ISODP7637/1.If voltagetran­sients more severe than the above ISO standard
have to be withstood,an externalprotectiondevice

6/9

(transil) must be connected between pin 15 and
GND. For transients up to 250V, t
R

=47Ω, the transil P6KE100P is recom-

source

pulse

= 500µs,

mended.

DIP16PACKAGE MECHANICAL DATA

L585

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

a1 0.51 0.020

B 0.77 1.65 0.030 0.065

b 0.5 0.020

b1 0.25 0.010

D 20 0.787

E 8.5 0.335

e 2.54 0.100

e3 17.78 0.700

F 7.1 0.280

I 5.1 0.201

L 3.3 0.130

Z 1.27 0.050

mm inch

7/9

L585

SO16PACKAGEMECHANICAL DATA

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 1.75 0.069
a1 0.1 0.2 0.004 0.008
a2 1.6 0.063

b 0.35 0.46 0.014 0.018

b1 0.19 0.25 0.007 0.010

C 0.5 0.020
c1

D 9.8 10 0.386 0.394

E 5.8 6.2 0.228 0.244

e 1.27 0.050

e3 8.89 0.350

F 3.8 4.0 0.150 0.157

L 0.5 1.27 0.020 0.050

M 0.62 0.024

S

mm inch

45° (typ.)

8° (max.)

8/9

L585

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for
the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its
use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifica­tions mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information pre­viously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or
systems without express writtenapproval of SGS-THOMSON Microelectronics.

 1994 SGS-THOMSON Microelectronics- All Rights Reserved

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