UNISONIC TECHNOLOGIES CO., LTD
UAC3092
ALTERNATOR VOLTAGE
REGULATOR
DESCRIPTION
The UAC3092 is specifically designed for voltage regulation and
Load Response Control (LRC) of diode rectified alternator charging
systems, as commonly found in automotive applications.
In maintaining system voltage, the UAC3092 monitors and
compares the system battery voltage to an externally programmed
set point value and pulse width modulates an N–channel MOSFET
transistor to control the average alternator field current.
LINEAR INTEGRATED CIRCUIT
SOP-20
SOP-24
FEATURE
*Forced Load Response Control (LRC) with Heavy Load Transitions
at Low RPM
*Capable of Regulating Voltage to
±0.1
V @ 25℃
*Operating Frequency Selectable with One External Resistor
*< 0.1 V Variation over Speed Range of 2000 to 10,000 RPM
*< 0.4 V Variation over 10% to 95% of Maximum Alternator Output
*Maintains Regulation with External Loads as Low as 1.0 A
*Load Dump Protection of Lamp, Field Control Devices, and Loads
*Duty Cycle Limit Protection
*Provides High Side MOSFET Control of a Ground Referenced Field
Winding
*Controlled MOSFET and Flyback Diode Recovery Characteristics
for Minimum RFI
*Optional 2.5 or 10 sec. LRC Rate Control (Osc. Freq. = 280 kHz)
*Undervoltage, Overvoltage and Phase Fault (Broken Belt) Detection
*Pb-free plating product number: UAC3092L
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
UAC3092-S20-R
UAC3092L-S20-R
UAC3092-S20-T
UAC3092L-S20-T
UAC3092-S24-R
UAC3092L-S24-R
UAC3092-S24-T
UAC3092L-S24-T
Package
SOP-20
SOP-20
SOP-24
SOP-24
Packing
Tape Reel
Tube
Tape Reel
Tube
UAC3092L-S20-R
(1)Packing Type
(2)Package Type
(3)Lead Plating
(1) R: Tape Reel, T: Tube
(2) S20: SOP-20, S24: SOP-24
(3) L: Lead Free Plating, Blank: Pb/Sn
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Copyright © 2005 Unisonic Technologies Co., Ltd
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QW-R121-003,B
UAC3092
PIN CONFIGURATIONS
LINEAR INTEGRATED CIRCUIT
20-pin Package
F i l ter Buffer
Remote Sens e
Lamp Col l ec tor
Lamp Bas e
G ND
G ND
O s c i l l ator Adj us t
V
R E F 0
O s c i l l ator
Phas e
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
R E F
Under v ol tage
Sour c e
G ate
NC
G ND
Vc c 1
Vc c 3
Suppl y Regul ati on
Rate
24-pin Package
F i l ter Buffer
Remote Sens e
Lamp Col l ec tor
Lamp Bas e
G ND
G ND
O s c i l l ator Adj us t
V
R E F 0
O s c i l l ator
Phas e
Rate
Suppl y Regul ati on
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
RE F
Under v ol tage
Sour c e
G ate
NC
NC
NC
NC
NC
G ND
Vc c 1
Vc c 3
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QW-R101-017,B
UAC3092
PIN DESCRIPTION
20-pin
24-pin
Package Package
PIN No.
1
2
1
PIN NAME
LINEAR INTEGRATED CIRCUIT
DESCRIPTION
3
4
5
6, 15
7
8
9
10
11
12
13
14
15,6
16
17
18
19
20
This pin provides a filtered result of the Sense input (if the Sense input is used)
or the Supply Regulation input (if the Sense input is not used).
The Sense input is a remote, low current battery voltage reference input used
2
Sense
to give an accurate representation of the true battery voltage. This input is also
used to monitor overvoltage or load dump conditions.
Lamp
This pin connects to the collector of the transistor (Q2) used to drive the fault
Collector and lamp. It is also used to sense a closed ignition switch (voltage sense) which
3
Power-Up/Do then turns power on to the IC.
wn
The Lamp Base pin provides base current to the fault lamp drive transistor
4
Lamp Base
(Q2).
5
Ground
Grounded to provide a ground return for the fault lamp control logic circuit.
6,15
Ground
IC ground reference pins.
Oscillator A resistor to ground on this pin adjusts the internal oscillator frequency.
7
Adjust
This is a test point for the 1.1V to 1.4V reference voltage. It has a zero
8
V
REF0
temperature coefficient. The reference is used internally for phase signal and
undervoltage detection.
9
Oscillator Test point for checking the operation of the internal oscillator.
The Phase input detects the existence of a magnetic field rotating within the
10
Phase
alternator.
The Rate pin is used to select a slow mode (floating) or fast mode (ground)
11
Rate
Load
Response Control recovery rate.
The voltage on the Supply Regulation pin is used as a representation of the
Supply
alternator output voltage. This input also used to monitor overvoltage or load
12
Regulation
dump conditions.
13
V
CC3
Positive supply for the internal Charge Pump.
14
V
CC1
Positive supply for the entire IC except for the Charge Pump.
15,6
Ground
Ground reference for the IC.
No connection.
16,17,18,
N/C
19,20
21
Gate
Controls the Gate of the MOSFET used to energize the field winding.
22
Source
Field winding control MOSFET source reference.
If the voltage at this pin goes below 1.0 V, the fault lamp is guaranteed to turn
23
Undervoltage
on. The IC will continue to function, but with limited performance.
Test point for the 1.7 V to 2.3 V Band gap reference voltage. This voltage has
24
V
REF
a negative temperature coefficient of approximately –11 mV
/℃
FB
Note: Pins 8, 9, 20(20 Pin Package) and 24(24 Pin Package) are test points only.
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QW-R101-017,B
UAC3092
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
1
FB UV V
REF
V
REF0
8
19 20
23 ** 24 **
Vcc1
14
Vcc3
13
UAC3092
Lost
Sense
Circuit
Bandgap
Reference
Bias
+
-
Power
Supply
Charge
Pump
17
21**
Gate
Undervoltage
Signal
Combiner
and Switch
Low
Pass
Filter
Load Dump
-
+
Overvoltage
+
+
-
Regulate
Control
Logic
12
Prescaler
(2
4
)
DAC 4
Counter
(2
8
)
Divide By
(1/12/48)
8
Up/Down
Counter
(2
4
)
6 15
Gnd
5
Gnd
Power
Up/Down
Circuit
18
22**
Sourc
e
3
Lamp
Coll.
2
Sense
(Remote)
12
Supply
Reg
(Local)
10
Phase
X1
Buff
+
-
+
-
Counter
Output
Control
Lamp
Control
Logic
4
Lamp
Base
7
Osc.
Adjust
Oscillator
9
Oscillator
11
Rate
Note: ** For 24-pin package
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QW-R101-017,B
UAC3092
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Power Supply Voltage
Load Dump Transient Voltage (Note 1)
Negative Voltage (Note 2)
Power Dissipation (Ta = 125
℃
)
SOP-20
SOP-24
LINEAR INTEGRATED CIRCUIT
SYMBOL
Vbat
+Vmax
–Vmin
P
D
Operating Junction Temperature
T
J
Operating Ambient Temperature
T
OPR
Storage Temperature
T
STG
Note: 1. 125 ms wide square wave pulse.
2. Maximum time = 2 minutes.
3. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
RATINGS
24
40
-2.5
867
1000
+150
-40 ~ +125
-45 ~ +150
UNIT
V
mW
mW
C
C
C
ELECTRICAL CHARACTERISTICS
(Ta=25
°
C, unless otherwise specified)
PARAMETER
SYMBOL
DC CHARACTERISTICS
Regulation Voltage
(Determined by external resistor
VReg
divider)
Regulation Voltage Temperature
Tc
Coefficient
Suggested Battery Voltage
Vbat
Operating Range
Power Up/Down Threshold
Vpwr
Voltage (Pin 3)
I
Q1
Standby Current
I
Q2
Zero Temperature Coefficient
Reference Voltage, (Pin 8)
Band Gap Reference Voltage
[Pin 20 (24**)]
Band Gap Reference
Temperature Coefficient
Sense Loss Threshold (Pin 2)
Phase Detection Threshold
Voltage (Pin 10)
Phase Rotation Detection
Frequency (Pin 10)
Undervoltage Threshold [Pin 19
(23**)]
Overvoltage Threshold
(Pin 2, or Pin 12 if Pin 2 is not
used)
Load Dump Threshold
(Pin 2, or Pin 12 if Pin 2 is not
used)
V
REF0
V
REF
TC
SLoss
(TH)
P
TH
P
POT
V
UV
V
OV
1.0
1.0
TEST CONDITIONS
MIN
TYP
MAX
UNIT
14.85
-13
11.5
0.5
Vbat = 12.8 V, Ignition off, Ta = 25
℃
Vbat = 12.8 V, Ignition off,
-40
℃
≦
Ta
≦
125
℃
1.1
1.7
-13
1.25
2.0
-11
0.6
1.25
36
1.25
1.5
-11
14.85
1.2
1.3
-9.0
16.5
2.0
2.0
3.0
1.4
2.3
-9.0
1.0
1.5
V
mV
/℃
V
V
mA
mA
V
V
mV
/℃
V
V
Hz
V
V
1.09(V
REF
)
1.12(V
REF
)
1.16(V
REF
)
V
LD
1.33(V
REF
)
1.4(V
REF
)
1.48(V
REF
)
V
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QW-R101-017,B
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