Datasheet L9484 Datasheet (ST)

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Page 1

Features

■ For air and liquid cooled applications

■ Ambient air temperature (thermistor)

compensated

■ Special default compensation curve with TS-

terminal open

■ Compensation curve with application specific

resistor on TS

■ Thermal protection

■ Field driver, lamp driver, relay driver, and df

(field monitor) short circuit protected

■ Load response control

■ Single phase autostart

L9484

Alternator voltage regulator

Multiiwatt8

Description

The L9484 is a monolithic multifunction alternator voltage regulator intended for use in automotive charging applications.

Table 1. Device summary

Order code Package Packing

L9484 Multiwatt8 Tube

L9484 regulates the output of an automotive generator by controlling the field winding current by means of a variable frequency PWM high side driver.

November 2008 Rev 3 1/11

www.st.com

Page 2

L9484

Contents

1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Electrical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.3 Electrical characteristcs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.4 Diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.5 Fault indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.6 Regulation features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

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L9484

1 Pin description

Table 2. Pin description

N # Pin Description

Generator output – voltage sense and power supply to ASVR

2 F+ Field driver - high side drive output

3 G Ground for ASVR (must be connected for ground for ASVR)

4 TS Thermistor sense terminal

Internally connected to the tab or slug in MW-8. Shall not be used for ASVR

5Gnd

ground, nor voltage applied to pin 5 to cause ≥ 50mV pin 5 to pin 3. May be unconnected or externally connected to pin 3.

6 DF Inverted field monitor output

7 L Lamp - low side driver; relay - high side driver

8 P Phase sense input

Figure 1. Pin connection (top view)

GND

F+

Tab connected to pin 5

D02AT502

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Page 4

2 Electrical specification

2.1 Absolute maximum ratings

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit

Output current capability Internally limited A

2.2 Thermal data

Table 4. Thermal data

Symbol Parameter Value Unit

th j-case

Power dissipation 6 W

tot

Short circuit protected

Junction temperature -40 to +150 °C

Storage temperature -50 to +150 °C

stg

Thermal shut-down 175 ± 15 °C

Thermal resistance junction to case 1.5 °C/W

L9484

All terminal, to VGO

and ground

2.3 Electrical characteristcs

Table 5. Electrical characteristcs

= -35°C to +150°C continuous unless otherwise specified)

case

Symbol Parameter Test condition Min. Typ. Max. Unit

Operating supply voltage T

Stand-by current

Regulator set-point 10kΩ between VGO and TS Curve shown in Figure 3

Regulator set-point

Generator output, no

battery

Thermal compensation voltage @ VGO

= +25°C to =150°C8 VovV

case

= -40°C to +25°C10 VovV

case

= 12.6V; T

10kΩ V

to TS; F+, G & tab

(slug) grounded; L, DF, & P

case

= 25°C;

300 μA unconnected; regulator not activated.

NTC thermistor with R 10kΩ; Tj = 90°C

No battery, I

= 2A to 50%

OUT

max. load

25°C

Curves shown in Figure 4

(with MURATA NTC

NTH4G39A1)

VSP -

VSP +

Curves shown in Figure 3

and Figure 4

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L9484

Table 5. Electrical characteristcs (continued)

= -35°C to +150°C continuous unless otherwise specified)

case

Symbol Parameter Test condition Min. Typ. Max. Unit

F-LIM

G-MIN

DF-LK

TURBO

1. The Field Drive capability shall not decrease as a function of temperature between 25°C and 150°C, at a rate faster than -0.024A/°C (for example, Field Drive shall be capable of ≥7.2A at 100°C).

Load regulation 6500 grpm, 10% to 95% load 300 mV

Speed regulation

Output saturation voltage

F-ON

Output saturation voltage

F-ON

Field limit current

(1)

Min. generator current load

Field discharge diode IF = 6A, T

D-F

Diode reverse current VR = 20V 1 mA

D-R

oscillation frequency During LRC operation 340 400 460 Hz

OSC

DF saturation voltage IDF ≤ 10mA 0.8 V

15A load, 2000 to 20,000 grpm

= 6A, VGO = 14.0V, T

case

25°C

= 5A, VGO = 13.5V, T

case

125°C

Current F+ Terminal to Gnd. @ T

case

≤ 25°C

Current F+ Terminal to Gnd. @ T

= +150°C

case

Current measured @ generator output

= 25°C1.85V

case

9.0 A

6.0 A

0.5 A

DF output leakage current VDF < 25V 10 μA

Internal clock frequency VDF = 32 - 35V; thru 2.2kΩ 4X Hz

IRD, SS, LRC rate VDF = 32 - 35V; thru 2.2kΩ÷ 16

100 mV

750 mV

850 mV

Figure 2. Typical application schematic

NTC

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L9484

Figure 3. Set-point voltage vs. mounting tab temperature (10kΩ between VGO & TS)

15.5

15.3

15.1

14.9

14.7

14.5

Volts

14.3

14.1

13.9

13.7

13.5

-40 -20 0 20 40 60 80 100 120

Junction Temp

Figure 4. Set-point voltage vs. thermistor temperature, T

= 90°C (not guaranteed by

testing, depending on NTC characteristics)

15.2

15.04

14.8

14.73

14.6

14.4

Volts

14.2

13.8

13.6

13.4

-40 -20 0 20 40 60 80 100 120

14.88

14.49

13.91

13.53

NTC Temp

Figure 5. Set-point voltages vs. mounting tab temperature (TS-open)

15.2

14.80

14.8

14.6

14.4

14.12

14.2

Set Voltages

13.8

13.6

13.4

13.2

-40 -20 0 20 40 60 80 100 120

14.63

14.00

Tem p

14.43

13.36

160

140

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L9484

2.4 Diagnostic

Table 6. Diagnostic

= -35°C to +150°C unless otherwise specified)

case

Symbol Parameter Conditions Min. Typ. Max. Units

L-SAT

L-SAT-BO

L-RLY

DELAY

1. This condition can happen when the connection between the battery and VGO or the output terminal of the generator is broken. The 1.1 second delay is not required, and current is sinked by ASVR.

2. When no fault is detected the Lamp terminal is pulled up by ASVR.

Over-voltage VSP + 1

Lamp ON saturation voltage IL = 0.5A (sinked by ASVR) >V

Lamp ON voltage

(1)

Lamp OFF (relay drive) saturation voltage (vs. B+)

IL < 0.5A, VGO = open; T 35°C to 85°C

IL = 750mA (sourced by

(2)

ASVR)

Tcase < 125C

case

= -

L-ACT

1.33 1.45 V

Fault indication delay time Delay before lamp ON 0.9 1.1 1.3 s

+ 2 V

1.3

3.8 5 V

1.85 V

2.5 Fault indication

Table 7. Fault indication table

Conditions T

Initial KEY-ON Bulb and wiring check (lamp ON for 1 sec ± 15% after initial KEY-ON) No

VGO > V

No connection between battery and V

At start: lamp ON until F

< F

< V

P-F

P-TR

AND VGO < V

@ V

P-TR

P>FP-IR

AND VP>V

. i.e. until VP reaches 8V. No

P-F

Delay

Ye s

2.6 Regulation features

Table 8.

Symbol Parameter Conditions Min. Typ. Max. Unit

L-PD

P-IR

P-TR

Regulation features

L terminal regulator activate threshold

L terminal pull down current

Initiate regulation phase voltage threshold

Terminate regulation phase voltage threshold

VGO=12.6V 0.8 1 1.15 V

VL = V VGO=12.6V

L-ACT

0.09 0.78 mA

Regulator activated 1.1 1.3 1.5 V

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L9484

Table 8.

Regulation features

(continued)

Symbol Parameter Conditions Min. Typ. Max. Unit

P-IR

P-TR

IRD Initiate regulation delay

Phase input voltage low fault

P-F

threshold

Phase terminal current sink

Initiate regulation phase frequency

Terminate regulation phase frequency

VP > 1.5V and < 12.6V VGO = 12.6V

Regulator activated, V

conditions met first time.

P-IR

AND

7.089.0V

0.3 3.5 mA

123 145 167 Hz

59 72 86 Hz

1.722.3s

Regulator activated and

FSDC Field strobe duty cycle

(regulation terminated or

16 18.75 22 %

regulation not initiated)

LRC Load response control rate Field drive duty cycle increase 34 40 46 %/s

P-LRC

SS Soft-start

LRC transition frequency LRC enabled if FP < F

LRC enabled until V

regardless other conditions

P-LRC

reached

255 300 345 Hz

34 40 46 %/s

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L9484

3 Package information

In order to meet environmental requirements, ST (also) offers these devices in ECOPACK® packages. ECOPACK

packages are lead-free. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label.

ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.

Figure 6. Multiwatt8 mechanical data and package dimensions

DIM.

A50.197

B 2.65 0.104

C1.60.063

E 0.49 0.55 0.019 0.022

F 0.78 0.85 0.030 0.033

G 2.40 2.54 2.68 0.094 0.10 0.105

G1 17.64 17.78 17.92 0.69 0 .70 0.71

H1 1 9.6 0.772

H2 20.2 0.795

L 20.35 20.65 0.80 0.81

L2 17.05 17.20 17.35 0.67 0 .68 0.68

L3 17.25 17 .5 17.75 0.679 0.689 0.699

L4 10.3 10.7 10.9 0.406 0.421 0.429

L7 2.65 2.9 0.104 0.114

S 1.9 2.6 0.075 0.102

S1 1.9 2.6 0.075 0.102

U 0.40 0.55 0.015 0.0 22

Z 0.70 0.85 0.028 0.034

Dia1 3.65 3.85 0.144 0.152

mm inch

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

OUTLINE AND

MECHANICAL DATA

Multiwatt8 (Pin 5 GND)

0043696 F

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Page 10

4 Revision history

Table 9. Document revision history

Date Revision Changes

15-Feb-2003 1 Initial release.

09-Sept-2004 2 Update

18-Nov-2008 3

L9484

Document reformatted. Document promoted from “product preview” to “datasheet“. Added Table 1: Device summary on page 1. Added ECOPACK text in Section 3: Package information.

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L9484

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