Datasheet

UNISONIC TECHNOLOGIES CO., LTD
UAC3092A
LINEAR INTEGRATED CIRCUIT
ALTERNATOR VOLTAGE
REGULATOR
DESCRIPTION
The UTC UAC3092A is designed for Load Response Control
and voltage regulation of diode rectified alternator charging
systems for automotive applications.
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
SOP-20
*Pb-free plating product number: UAC3092AL
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
UAC3092A-S20-R
UAC3092AL-S20-R
UAC3092A-S20-T
UAC3092AL-S20-T
Package
Packing
SOP-20
SOP-20
Tape Reel
Tube
UAC3092AL-S20-R
(1)Packing Type
(1) R: Tape Reel, T: Tube
(2)Package Type
(2) S20: SOP-20
(3)Lead Plating
(3) L: Lead Free Plating, Blank: Pb/Sn
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UAC3092A
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
Filter Buffer
1
20 VREF
Remote Sense
2
19 Undervoltage
Lamp Collector
3
18
Source
Lamp Base
4
17
Gate
5
16
NC
6
15
Gnd
7
14
Vcc1
8
13
Vcc3
9
12
Supply Regulation
Phase 10
11
Rate
Gnd
Oscillato Adjust
VREFΦ
Oscillator
PIN DESCRIPTION
PIN NO.
1
2
PIN NAME
FB
Sense
Lamp Collector and
Power-Up/Down
Lamp Base
Ground
Ground
Oscillator Adjust
VREFΦ
Oscillator
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
VREF
Pin for the Band gap reference voltage 1.7 V ~ 2.3 V.
Note: Pin 8, and 20 are test points only
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UAC3092A
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
FB UV
1 19
VREF
20
VREF Φ
8
Bandgap
Reference
UTC
UAC3092 A
Lost
Sense
Circuit
Sense
(Remote)
Supply Reg
(Local )
Signal
Combiner
and switch
Low
Pass
filter
Buff
+
-
+
Phase
+
-
Output
Control
12
7
18
Power
Up/Down
Circuit
Overvoltage
Control
Logic
DAC
Osc . Adjust
Gate
Undervoltage
Regulate
Counter
Prescaler
(24 )
17
Charge
Pump
- Load Dump
+
X1
10
Vcc3
13
Power
Supply
Bias
+
-
2
12
Vcc1
14
Prescaler
(26 )
4
3
Lamp
Control
Logic
4
Source
Lamp coII .
Lamp Base
8
5
Divide By
(1/12/48)
Up/ Down
Counter
4
(2 )
Gnd
Oscillator
9
Oscillator
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11
Rate
6 15
Gnd
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UAC3092A
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
(Ta=25℃)
PARAMETER
SYMBOL
RATINGS
UNIT
VBAT
24
Power Supply Voltage
40
V
Load Dump Transient Voltage (Note 1)
+VMAX
-2.5
Negative Voltage (Note 2)
-VMIN
Power Dissipation (Ta=125℃)
PD
867
m/W
Operating Junction Temperature
TJ
+150
℃
Operating Ambient Temperature Range
TOPR
-35 ~ +125
℃
Storage Temperature Range
TSTG
-45 ~ +150
℃
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.
THERMAL DATA
PARAMETER
Thermal Resistance, Junction to Ambient
SYMBOL
θJA
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
VREG
Determined by external resistor divider
14.85
V
Regulation Voltage Temperature
TC
-13
-11
-9.0 mV/℃
Coefficient
Suggested Battery Voltage
VBAT
11.5 14.85 16.5
V
Operating Range
Power Up/Down Threshold
VPWR
0.5
1.2
2.0
V
Voltage (Pin 3)
IQ1
VBAT=12.8V, Ignition off, Ta=25℃
1.3
2.0
mA
Standby Current
IQ2
VBAT=12.8V, Ignition off, -35℃≤Ta≤125℃
3.0
Zero Temperature Coefficient
1.1
1.25
1.4
V
VREFφ
Reference Voltage, (Pin 8)
Band Gap Reference Voltage
VREF
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)
SLOSS (TH)
0.6
1.0
V
Phase Detection Threshold
PTH
1.0
1.25
1.5
V
Voltage (Pin 10)
Phase Rotation Detection
PROT
36
Hz
Frequency (Pin 10)
Undervoltage Threshold (Pin 19)
UUV
1.0
1.25
1.5
V
Overvoltage Threshold
VOV
Pin 2, or Pin 12 if Pin 2 is not used
V
1.09(V ) 1.12(V ) 1.16(V )
Load Dump Threshold
VLD
Pin 2, or Pin 12 if Pin 2 is not used
V
1.33(V )
1.4(V )
1.48(V )
REF
REF
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REF
REF
REF
REF
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UAC3092A
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTIC(Cont.)
PARAMETER
SYMBOL
SWITCHING CHARACTERISTICS
Fundamental Regulation Output
f
Frequency. (Pin 17)
Suggested Clock Oscillator
fosc
Frequency Range, (Pin 9)
Duty Cycle (Pin 17)
StartDC
At Start-up
OVDC
During Overvoltage Condition
Low/High RPM Transition
LRCFreq
Frequency (Pin 10)
LRCS
LRCF
LRC Duty Cycle Increase Rate
LRCH
TEST CONDITIONS
MIN
Clock oscillator frequency divided by
4096
Determined by external resistor, RT
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)
TYP
MAX UNIT
68
Hz
205
280
350
kHz
27
3.5
29
4.7
31
5.5
%
%
247
273
309
Hz
8.5
9.5
10.5
34
38
42
409
455
501
%/sec
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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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