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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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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 VR 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
VR 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 VR 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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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 VREF0 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 VCC3 Positive supply for the internal Charge Pump. 14 VCC1 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 VREF 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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UAC3092
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
1
FB UV VREF VREF0 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 DAC 4 Counter (28) 8 Divide By (1/12/48) Up/Down Counter (24) 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
Prescaler (24) Oscillator 9 Oscillator
11 Rate
Note: ** For 24-pin package
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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 PD
Operating Junction Temperature TJ Operating Ambient Temperature TOPR Storage Temperature TSTG 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=25C, 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) IQ1 Standby Current IQ2 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) VREF0 VREF TC SLoss(TH) PTH PPOT VUV VOV 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(VREF)
1.12(VREF)
1.16(VREF)
VLD
1.33(VREF)
1.4(VREF)
1.48(VREF)
V
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UAC3092
ELECTRICAL CHARACTERISTICS(Cont.)
PARAMETER SYMBOL SWITCHING CHARACTERISTICS Fundamental Regulation Output f Frequency, [Pin 17 (21**)] Suggested Clock Oscillator fosc Frequency Range, (Pin 9) Duty Cycle [Pin 17 (21**)] At Start-up StartDC During Overvoltage Condition OVDC Low/High RPM Transition LRCFreq Frequency (Pin 10) LRCS LRCF LRC Duty Cycle Increase Rate LRCH
LINEAR INTEGRATED CIRCUIT
TEST CONDITIONS Clock oscillator frequency divided by 4096 Determined by external resistor, RT
MIN
TYP
MAX
UNIT
68 205 27 3.5 247 280 29 4.7 273 9.5 38 455 350 31 5.5 309 10.5 42 501
Hz kHz % Hz
Low RPM Mode (LRCFreq < 247 Hz), Pin 11 = Open (Slow Rat) Low RPM Mode (LRCFreq < 247 Hz), Pin 11 = Grounded (Fast Rate) High RPM Mode (LRCFreq > 309 Hz), Pin 11 = Don't Care (LRC Mode is disabled)
8.5 34 409
%/sec
Note:
** For 24-pin package.
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Sense Phase 86k 250 1.0k Vcc1 13 Vcc3 VREF VREF0 20 8 14
24 **
28k R3 FB UV 1 19
23**
UAC3092
B+Supply
45k
28k
UAC3092
Bandgap Reference Bias Charge Pump Gate
22**
MTB36N06E (Q1)
APPLICATION CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
Power Supply
21**
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17 20k Lost Sense Circuit FB 18 + - Undervoltage 2.0k Field
Buff
2
Load Dump +
Sense
Signal Combiner and Switch Low Pass Filter Power Up/Down Circuit

Sourc e 3 2.0k Lamp Coll. BSP52T1 (Q2) 4
Lamp
Lgnition
12
X1
Supply Reg (Local) + + Counter 12 Prescaler (24) 9 Oscillator DAC 4 Counter (28) 2.5 sec 10 sec Divide By (1/12/48) 8 Control Logic Regulate Output Control
Overvoltage + + -
500
10
Phase
Lamp Control Logic
Lamp Base Stator 5 Gnd 10 MB850 Up/Down Counter 4 (2 )
R1
12.5k
7
Oscillator
R2
11 Rate
Gnd 6
15
Battery Ground Alternate Stator Configuration
RT Osc. Adjust
LINEAR INTEGRATED CIRCUIT
Notes:R1=R2=3.0k to 5.0k R3=10k to 15k RT=50k to 100k ** For 24-pin package.
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UAC3092
TYPICAL CHARACTERISTICS
Standby Current vs. Temperature 0.8 ISB=Current from Vcc Supply Vcc=12.8V see Figure 1) lgnition OFF) Vc1=0.5V I(tot) VPin2=VPin12=1.5V mA VPin10=VPin11=VPin19 23** =0V 1.8 1.7
LINEAR INTEGRATED CIRCUIT
Turn-On Voltage vs. Temperature VON=Voltage at Pin 3 Vcc=12.8V see Figure 1) VPin2=VPin12=1.5V VPin10=VPin11=VPin19 23** =0V
Standby Current, ISB mA)
Turn-on Voltage, VON V)
0.7 0.6 0.5 0.4 0.3 0.2 -55
1.6 1.5 1.4 1.3 1.2 1.1
75 50 0 25 -25 Ambient Temperature, Ta
100 125
1.0 -55
50 75 -25 0 25 Ambient Temperature, Ta
100 125
Reference Voltage vs. Temperature 2.2 1.26
0TC Reference Voltage vs. Temperature
2.1
2.0
TC Reference Voltage, VREF0 V)
Reference Voltage, VREF V)
VREF=Voltage at Pin 20 24** Vcc=12.8V see Figure 1) lgnition OFF) Vc1=0.5V I(tot) mA VPin2=VPin12=1.5V VPin10=VPin11=VPin19 23** =0V
VREF0=Voltage at Pin 8 Vcc=12.8V see Figure 1) 1.25 Vc2=6.0V S1 Colsed) VPin2=VPin12=1.5V 1.24 VPin10=VPin11=VPin19 23**)=0V 1.23 1.22 1.21 1.20 -55 50 75 -25 0 25 Ambient Temperature, Ta 100 125
1.9
1.8 -55
-25
0
25
50
75
100 125
Ambient Temperature, Ta (
Oscillator Frequency vs . Timing Resistor 110 100
R=Resistance from Pin 7 to Ground f=Frequency at Pin9
Input Voltage vs. Output Duty Cycle 3.0 2.5 2.0 1.96 1.95 1.94 1.93 0 Load Dump Protection
Vin=Voltage at Pin 2 or 12 Duty Cycle taken at Pin 17(21**) Vcc=14.8V (see Figure 1) Vc2=6.0V (S1 Closed) VPin 10=1.5V@>309Hz VPin 11=0V, VPin 19(23**)=1.5V
90 80 Vcc=14.8V (see Figure 1) 70 Vc2=6.0V (S1 Closed) 60 200 220 240 260 280 300 320 340 360 Frequency, f (kHz)
VPin 2= VPin10=VPin 12= VPin 19(23**)= 1.5 V VPin11=0V
Input Voltage, VIN (V)
Resistance, RT (k
10 20 30 40 50 60 70 80 90 100 Duty Cycle, DC (%)
Note: ** For 24-pin package.
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UAC3092
TYPICAL TEST CIRCUIT
LINEAR INTEGRATED CIRCUIT
Vcc
250 FB UV VREF VREF0 8 1 19 20 23** 24** 1.0k 14 Vcc1 13 Vcc3
UAC3092
Lost Sense Circuit
Bandgap Reference Bias + -
Power Supply Charge Pump
21** 17 Gate 22** 18 2.0k Sourc e 3 Lamp 2.0k Coll. S1 vc1 vc2
Undervoltage
2 Sense (Remote) 12 Supply Reg (Local) 10 Phase X1
Signal Combiner and Switch
Low Pass Filter
Buff
+
Load Dump
Overvoltage + + Regulate + + Counter 12 Prescaler (24) DAC 4 Counter (28) Divide By (1/12/48) Control Logic 8 Up/Down Counter (24)
Power Up/Down Circuit
Output Control
Lamp Control Logic
4 Lamp Base 5 Gnd
7 RT
Oscillator 9 Oscillator Output
Rate
11
6 15 Gnd
Note: ** For 24-pin package
Figure 1.
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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