UNISONIC TECHNOLOGIES CO., LTD
UAC33092A
ALTERNATOR VOLTAGE
REGULATOR
DESCRIPTION
The UTC
UAC33092A
is designed for Load Response Control
and voltage regulation of diode rectified alternator charging
systems for automotive applications.
LINEAR INTEGRATED CIRCUIT
FEATURES
* Forced load response control (LRC) with heavy load transitions
at low RPM
* Voltage regulated to ± 0.1V @ 25°C
* External resistor adjustable operating frequency
* Regulation is effective with loads as high as 1.0A
* Load dump protection of lamp, field control devices, and loads
* Undervoltage, overvoltage , phase fault (broken belt) detection
and duty cycle limited protections
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UAC33092AL-S20-R
UAC33092AG-S20-R
UAC33092AL-S20-T
UAC33092AG-S20-T
Package
SOP-20
SOP-20
Packing
Tape Reel
Tube
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UAC33092A
PIN CONFIGURATION
LINEAR INTEGRATED CIRCUIT
PIN DESCRIPTION
DESCRIPTION
This pin provides Sense input or the Supply Regulation input.
The Sense input is input for the true battery voltage.
This pin connects to drive the fault lamp. It is also used to sense a closed ignition
3
switch (voltage sense).
4
This pin provides base current to the fault lamp drive transistor (Q2).
5
This pin is for Ground return for the fault lamp control logic circuit.
6
IC ground
7
Connected to a resistor to ground that adjusts the internal oscillator frequency
8
This is a pin for the 1.1 V ~ 1.4 V reference voltage test.
9
This is a pin 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 Load Response Control recovery rate selector pin used to select a
11
Rate
slow mode (floating) or fast mode (ground).
The Supply Regulation pin is used as a representation of the alternator output
12
Supply Regulation
voltage. This input also used to monitor overvoltage or load dump conditions.
13
Vcc3
Voltage supply for the internal Charge Pump.
14
Vcc1
Voltage supply for the entire IC except for the Charge Pump.
15
Ground
Ground for the IC.
16
N/C
No connection.
17
Gate
The Gate Controls of the MOSFET used to energize the field winding.
18
Source
MOSFET source reference for Field winding control.
If this pin have voltage goes below 1.0 V, the fault lamp is turn on. The IC will
19
Undervoltage
continue to function, but with limited performance.
20
V
REF
Pin for the Band gap reference voltage 1.7 V ~ 2.3 V.
Note: Pin 8, and 20 are test points only
PIN NO.
1
2
PIN NAME
FB
Sense
Lamp Collector and
Power-Up/Down
Lamp Base
Ground
Ground
Oscillator Adjust
V
REF
Φ
Oscillator
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UAC33092A
BLOCK DIAGRAM
FB UV
1 19
UTC
UAC3092A
Lost
Sense
Circuit
2
Signal
Combiner
and switch
-
+
+
-
Low
Pass
filter
Load Dump
V
REF
20
V
REF
Φ
8
LINEAR INTEGRATED CIRCUIT
Vcc1
14
Bandgap
Reference
Bias
Power
Supply
Charge
Pump
Vcc3
13
17
Gate
18
Undervoltage
Sense
(Remote)
Source
Buff
Supply Reg
(Local)
12
X1
+
-
Overvoltage
Power
Up/Down
Circuit
3
Lamp coII.
+
-
Phase
10
+
-
Counter
Regulate
Output
Control
Control
Logic
Lamp
Control
Logic
4
Lamp Base
12
DAC
Prescaler
4
(2 )
Osc. Adjust
7
Oscillator
9
Oscillator
11
Rate
Prescaler
6
(2 )
4
8
5
Divide By
(1/12/48)
Up/Down
Counter
4
(2 )
Gnd
6 15
Gnd
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UAC33092A
ABSOLUTE MAXIMUM RATINGS
(Ta=25℃)
PARAMETER
LINEAR INTEGRATED CIRCUIT
Power Supply Voltage
V
Load Dump Transient Voltage (Note 1)
Negative Voltage (Note 2)
Power Dissipation (Ta=125℃)
m/W
Operating Junction Temperature
℃
Operating Ambient Temperature Range
℃
Storage Temperature Range
℃
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.
SYMBOL
V
BAT
+V
MAX
-V
MIN
P
D
T
J
T
OPR
T
STG
RATINGS
24
40
-2.5
867
+150
-35 ~ +125
-45 ~ +150
UNIT
THERMAL DATA
PARAMETER
Thermal Resistance, Junction to Ambient
SYMBOL
θ
JA
RATINGS
75
UNIT
°C/W
ELECTRICAL CHARACTERISTICS
(External components per Figure 1,Ta=25℃, unless otherwise noted.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
DC CHARACTERISTICS
Regulation Voltage
V
REG
Determined by external resistor divider
14.85
V
Regulation Voltage Temperature
T
C
-13
-11
-9.0 mV/℃
Coefficient
Suggested Battery Voltage
V
BAT
11.5 14.85 16.5
V
Operating Range
Power Up/Down Threshold
V
PWR
0.5
1.2
2.0
V
Voltage (Pin 3)
I
Q1
V
BAT
=12.8V, Ignition off, Ta=25℃
1.3
2.0
mA
Standby Current
I
Q2
V
BAT
=12.8V, Ignition off, -35℃≤Ta≤125℃
3.0
Zero Temperature Coefficient
1.1
1.25
1.4
V
V
REF
φ
Reference Voltage, (Pin 8)
Band Gap Reference Voltage
V
REF
1.7
2.0
2.3
V
(Pin 20)
Band Gap Reference
TC
-13
-11
-9.0 mV/℃
Temperature coefficient
Sense Loss Threshold (Pin 2)
S
LOSS (TH)
0.6
1.0
V
Phase Detection Threshold
P
TH
1.0
1.25
1.5
V
Voltage (Pin 10)
Phase Rotation Detection
P
ROT
36
Hz
Frequency (Pin 10)
Undervoltage Threshold (Pin 19)
U
UV
1.0
1.25
1.5
V
Overvoltage Threshold
V
OV
Pin 2, or Pin 12 if Pin 2 is not used
V
1.09(V ) 1.12(V ) 1.16(V )
Load Dump Threshold
V
LD
Pin 2, or Pin 12 if Pin 2 is not used
V
1.33(V )
1.4(V )
1.48(V )
REF
REF
REF
REF
REF
REF
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ELECTRICAL CHARACTERISTIC(Cont.)
PARAMETER
SYMBOL
SWITCHING CHARACTERISTICS
Fundamental Regulation Output
f
Frequency. (Pin 17)
Suggested Clock Oscillator
f
osc
Frequency Range, (Pin 9)
Duty Cycle (Pin 17)
StartDC
At Start-up
OV
DC
During Overvoltage Condition
Low/High RPM Transition
LRC
Freq
Frequency (Pin 10)
LRC
S
LRC
F
LRC Duty Cycle Increase Rate
LRC
H
LINEAR INTEGRATED CIRCUIT
TEST CONDITIONS
Clock oscillator frequency divided by
4096
Determined by external resistor, R
T
MIN
TYP
68
MAX UNIT
Hz
350
31
5.5
309
10.5
42
%/sec
501
kHz
%
%
Hz
205
27
3.5
247
280
29
4.7
273
9.5
38
455
Low RPM Mode(LRCFreq<247Hz) Pin
11 =Open (Slow Rate)
Low RPM Mode(LRCFreq<247Hz)
Pin 11 =Grounded (Fast Rate)
High R PMMode(LRCFreq>309Hz)
Pin 11 = Don’t Care (LRC Mode is
disabled)
8.5
34
409
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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