ST L9473 User Manual

Features
For air and liquid cooled applications
Ambient air temperature (thermistor)
compensated
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
L9473
Car alternator voltage regulator
Multiwatt8
Description
The L9473 is a monolithic multifunction generator Voltage regulator intended for use in automotive charging applications.

Table 1. Device summary

Order code Package Packing
L9473J Multiwatt8 Tube
This All Silicon Voltage Regulator regulates the output of an automotive generator by controlling the field winding current by means of a variable frequency PWM high side driver.
October 2008 Rev 2 1/10
www.st.com
10
Contents L9473
Contents
1 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3 Electrical characteristcs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2/10
L9473 Block diagram and pin description

1 Block diagram and pin description

1.1 Block diagram

Figure 1. Block diagram

NTC
7
6

1.2 Pin description

Table 2. Pin description

Pin Description
1V
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
5GND
6 DF Inverted Field Monitor Output
7 L Lamp - Low Side Driver; Relay - High Side Driver
8 P Phase Sense Input
Generator Output – Voltage Sense and Power Supply to ASVR
GO
Internally connected to the Tab or Slug in MW-8. Shall not be used for ASVR Ground, nor voltage applied to Pin 5 to cause 50mV Pin 5 to Pin 3. May be unconnected or externally connected to Pin 3.
4
1
8
2
3

Figure 2. Pin connection (top view)

Tab connected to pin 5
8
7
6
5
4
3
2
1
D02AT502
P
L
DF
GND
TS
G
F+
V
GO
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Electrical specifications L9473

2 Electrical specifications

2.1 Absolute maximum ratings

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit
I
OC
P
Output current capability Internally limited A
Power dissipation 6 W
tot
Short circuit protected
All terminal, to VGO
and GND

2.2 Thermal data

Table 4. Thermal data

Symbol Parameter Value Unit
T
T
T
R
th j-case
Junction temperature -40 to +150 °C
j
Storage temperature -50 to +150 °C
stg
Thermal shut-down 175 ± 15 °C
sd
Thermal resistance junction to case 1.5 °C/W

2.3 Electrical characteristcs

Table 5. Electrical characteristcs

Symbol Parameter Test condition Min. Typ. Max. Unit
(T
= -35°C to +150°C continuous unless otherwise specified)
case
T
= +25°C to =150°C8 VovV
V
I
Operating supply voltage
OS
Standby current
SB
case
T
= -40°C to +25°C10 VovV
case
V
= 12.6V; T
GO
10kΩ V
to TS; F+, G & Tab
GO
(Slug) Grounded; L, DF, & P unconnected; Regulator NOT Activated.
10kΩ between V
V
Regulator set-point
SP
NTC thermistor with R 10kΩ; Tj = 90°C
V
V
Generator output, no battery
NB
T
Thermal compensation Voltage @ VGO Curves shown in Figure 4 and 5
C
Load regulation 6500 grpm, 10% to 95% load 300 mV
LR
No battery, I Max. Load
4/10
= 25°C;
case
and TS Curve shown in Figure 3
GO
25°C
=
Curves shown in Figure 4
(with MURATA NTC NTH4G39A1)
= 2A to 50%
OUT
V
- 2
SP
300 μA
+
V
SP
2
V
L9473 Electrical specifications
Table 5. Electrical characteristcs (continued)
(T
= -35°C to +150°C continuous unless otherwise specified)
case
Symbol Parameter Test condition Min. Typ. Max. Unit
V
V
F-ON
V
F-ON
I
F-LIM
I
F-LIM
I
G-MIN
V
I
F
V
I
DF-LK
F
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).
Speed regulation 15A load, 2000 to 20,000 grpm 100 mV
SR
I
= 6A, VGO = 14.0V,
Output saturation voltage
Output saturation voltage
Field limit current
Field limit current
(1)
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
DF
F
T
= 25°C
case
= 5A, VGO = 13.5V,
I
F
= 125°C
T
case
Current F+ Terminal to Gnd.
case
25°C
@ T
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; at 2.2kΩ 4X Hz
750 mV
850 mV

Figure 3. Set-point voltage vs. mounting tab temperature

(10kΩ between V
15.4
15.4
15.3
15.3
15.17
15.17
15.2
15.2
15
15
15.01
15.01
14.8
14.8
14.84
14.84
Volts
Volts
14.6
14.6
14.4
14.4
14.2
14.2
-40 -20 0 20 40 60 80 100 120
-40 -20 0 20 40 60 80 100 120
and TS)
GO
15.08
15.08
14.86
14.86
14.69
14.69
Junction Temp
Junction Temp
14.77
14.77
14.59
14.59
14.41
14.41
14.3
14.3
5/10
Electrical specifications L9473
Figure 4. Set-point voltage vs. thermistor temperature, Tj = 90°C
(Not guaranteed by testing, depending on NTC characteristics)
15.2
15.04
15
14.8
14.73
14.6
14.4
Volts
14.2
14
13.8
13.6
13.4
-40 -20 0 20 40 60 80 1 00 120
14.88
14.49
13.91
13.53
NTC Temp

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

15.0
15.0
14.8
14.8
14.73
14.73
14.6
14.6
14.4
14.4
14.2
14.2
14.12
14.12
14.0
14.0
13.8
13.8
Set Voltage
Set Voltage
13.6
13.6
13.4
13.4
13.2
13.2
13.0
13.0
-40 -20 0 20 40 60 80 100 120 140 160
-40 -20 0 20 40 60 80 100 120 140 160
14.63
14.63
14.00
14.00
Temp
Temp
14.43
14.43
13.78
13.78

Table 6. Diagnostic

(T
= -35°C to +150°C unless otherwise specified)
case
Symbol Parameter Conditions Min. Typ. Max. Units
+
V
SP
V
OV
V
UV
V
L-SAT
V
L-SAT-BO
V
L-RLY
T
DELAY
Over voltage VSP + 1
F
> F
Under voltage
P
S_term and V
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 ASVR)
(2)
T
case
, 10kohm between
P-LRC
GO
< 125°C
case
10.95 11.8 V
L-ACT
1.33 1.45 V
=
Fault Indication Delay Time Delay before Lamp ON 0.9 1.1 1.3 s
V
+ 2 V
1.3
SP
3.8 5 V
1.85 V
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.
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L9473 Electrical specifications

Table 7. Fault indication

Conditions TDelay?
Table 8.
Initial KEY-ON Bulb and Wiring Check (Lamp ON for 1 sec ± 15% after initial KEY­ON)
VGO > V
V
F
No connection between battery and V
At start: Lamp ON until F
Regulation characteristics
P
P
< V
< F
P-F
P-TR
OV
AND VGO < V
@ V
P-TR
SP
P>FP-IR
GO
AND VP>V
. i.e. until VP reaches 8V. No
P-F
No
Ye s
Ye s
Ye s
No
Symbol Parameter Conditions Min. Typ. Max. Unit
V
I
V
F
F
L-PD
P-TR
L terminal regulator activate
L-PD
threshold
L terminal pull down current
Initiate regulation phase voltage
P-IR
threshold
I
Phase terminal current sink
P
Initiate regulation phase
P-IR
frequency
Terminate regulation phase frequency
IRD Initiate regulation delay
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
VP > 1.5V and < 12.6V VGO = 12.6V
0.25 3.5 mA
123 145 167 Hz
59 72 86 Hz
Regulator Activated, V F
Conditions Met First Time.
P-IR
P-IR
AND
2.533.5s
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 8.5 10 11.5 %/s
F
P-LRC
SS Soft-start
LRC transition frequency LRC Enabled if FP < F
LRC enabled until V
SP
regardless other conditions
P-LRC
reached
255 300 345 Hz
34 40 46 %/s
7/10
Package information L9473

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 0.1 05
G1 17.64 17.78 17.92 0.69 0.70 0. 71
H1 19.6 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 0.1 02
U 0.40 0.55 0.015 0.022
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)
8/10
0043696 F
L9473 Revision history

4 Revision history

Table 9. Document revision history

Date Revision Changes
20-May-1994 1 Initial release.
24-Oct-2008 2
Document reformatted. "Added ECOPACK mention" in Section 3: Package information.
9/10
L9473
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