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UTC MC33092 LINEAR INTEGRATED CIRCUIT
ALTERNATOR VOLTAGE REGULATOR
DESCRIPTION
The MC33092 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 MC33092 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.
SOP-20
FEATURE
*Forced Load Response Control (LRC) with Heavy Load Transitions at Low RPM *Capable of Regulating Voltage to 0.1 V @ 25C *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
SOP-24
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UTC MC33092 LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION 20-pin Package
F i l t er B u f f er R emot e S en s e L am p C ol l ec t or L amp B as e GND GND O s c i l l at or A d j u s t V r ef 0 O s c i l l at or P h as e
1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11
V r ef U n d er vol t ag e S ou r c e G at e NC GND Vcc1 Vcc3 S u p p l y R eg u l at i on R at e
24-pin Package
F i l t er B u f f er R emot e S en s e L am p C ol l ec t or L amp B as e GND GND O s c i l l at or A d j u s t V r ef 0 O s c i l l at or P h as e R at e S u p p l y R eg u l at i 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 r ef U n d er vol t ag e S ou r c e G at e NC NC NC NC NC GND Vcc1 Vcc3
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UTC MC33092 LINEAR INTEGRATED CIRCUIT
PIN DESCRIPTION
20-pin Package 1 24-pin Package 1
PIN NAME
FB
DESCRIPTION
PIN No.
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 to give an accurate representation of the true battery Sense voltage. This input is also used to monitor overvoltage or load dump conditions. Lamp Collector This pin connects to the collector of the transistor (Q2) used to drive the fault lamp. It is also used to sense a closed ignition switch (voltage and Power-Up/Down sense) which then turns power on to the IC. The Lamp Base pin provides base current to the fault lamp drive Lamp Base transistor (Q2). Grounded to provide a ground return for the fault lamp control logic Ground circuit. Ground IC ground reference pins. Oscillator Adjust A resistor to ground on this pin adjusts the internal oscillator frequency. This is a test point for the 1.1 V to 1.4 V reference voltage. It has a zero Vref0 * temperature coefficient. The reference is used internally for phase signal and undervoltage detection. Oscillator * Test point for checking the operation of the internal oscillator. The Phase input detects the existence of a magnetic field rotating Phase within the alternator. The Rate pin is used to select a slow mode (floating) or fast mode Rate (ground) Load Response Control recovery rate. The voltage on the Supply Regulation pin is used as a representation Supply of the alternator output voltage. This input also used to monitor Regulation overvoltage or load dump conditions. VCC3 Positive supply for the internal Charge Pump. VCC1 Positive supply for the entire IC except for the Charge Pump. Ground Ground reference for the IC. No connection. N/C Gate Source
2
2
3 4 5 6, 15 7 8 9 10 11
3
4 5 6,15 7 8 9 10 11
12 13 14 15,6 16 17 18
12 13 14 15,6 16,17,18, 19,20 21 22
Controls the Gate of the MOSFET used to energize the field winding. Field winding control MOSFET source reference. If the voltage at this pin goes below 1.0 V, the fault lamp is guaranteed 23 Undervoltage to turn on. The IC will continue to function, but with limited 19 performance. Test point for the 1.7 V to 2.3 V Bandgap reference voltage. This voltage has a negative temperature coefficient of approximately -11 24** Vref * 20 mV/C. NOTE: * Pins 8, 9 and 20(24**) are test points only. ** For 24-pin package.
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UTC MC33092 LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
FB UV Vref Vref0 19 20 8
23** 24**
1
Vcc1 14
Vcc3 13
MC33092
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 (24) DAC 4 Counter (28) Divide By (1/12/48) 8 Up/Down Counter (24) 6 15 Gnd 5 Gnd Power Up/Down Circuit 18 22** Source 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
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Power Supply Voltage Load Dump Transient Voltage (Note 1) Negative Voltage (Note 2) Power Dissipation (Ta = 125C) SOP-20 SOP-24 Operating Ambient Temperature Operating Junction Temperature Storage Temperature NOTES: 1. 125 ms wide square wave pulse. 2. Maximum time = 2 minutes.
SYMBOL
Vbat +Vmax -Vmin PD Ta Tj Tstg
RATINGS
24 40 -2.5 867 1000 -40 ~ +125 +150 -45 ~ +150
UNIT
V
mW
C C C
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UTC MC33092 LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS (Ta=25C, unless otherwise specified)
PARAMETER DC CHARACTERISTICS
Regulation Voltage (Determined by external resistor divider) Regulation Voltage Temperature Coefficient Suggested Battery Voltage Operating Range Power Up/Down Threshold Voltage (Pin 3) Standby Current, Vbat = 12.8 V, Ignition off, Ta = 25C Vbat = 12.8 V, Ignition off, -40CTa125C 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)
SYMBOL
VReg Tc Vbat Vpwr IQ1
MIN
TYP
14.85
MAX
UNIT
V
-13 11.5 0.5
-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 1.5 1.16(Vref) 1.48(Vref)
mV/C V V mA mA V V mV/C V V Hz V V V
IQ2
Vref0 Vref TC SLoss(th) PTh PRot VUV VOV VLD 1.1 1.7 -13 1.0 1.0 1.09(Vref) 1.33(Vref) 1.25 2.0 -11 0.6 1.25 36 1.25 1.12(Vref) 1.4(Vref)
SWITCHING CHARACTERISTICS
Fundamental Regulation Output Frequency, [Pin 17 (21**)] (Clock oscillator frequency divided by 4096) Suggested Clock Oscillator Frequency Range, (Pin 9) (Determined by external resistor, RT) Duty Cycle [Pin 17 (21**)] At Start-up During Overvoltage Condition Low/High RPM Transition Frequency (Pin 10) LRC Duty Cycle Increase Rate 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) NOTE: ** For 24-pin package. f fosc StartDC OVDC LRCFreq LRCS LRCF LRCH 205 27 3.5 247 8.5 34 409 68 280 29 4.7 273 9.5 38 455 350 31 5.5 309 10.5 42 501 %/sec Hz kHz % Hz
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Sense 28k Phase 86k 250 1.0k Vcc1 13 Vcc3 Vref 20 14
24**
UTC
R3 FB UV 1 19
23**
B+Supply
45k 28k
Vref0 8
APPLICATION CIRCUIT
MC33092
Bandgap Reference Bias Charge Pump Gate
22**
MTB36N06E (Q1)
Power Supply
21**
17
20k
Lost Sense Circuit FB 18 + - Undervoltage 2.0k Source 3 2.0k Lamp Coll. BSP52T1 (Q2) Lamp Control Logic 4 Lamp Base 8 Divide By (1/12/48) 5 Gnd 10 Up/Down Counter (24) 11 Rate Gnd 6 15
Field
2 Sense

Signal Combiner and Switch Low Pass Filter
Buff
Load Dump +
Lamp
Lgnition
12 Supply Reg (Local) 10 Phase 12 R1 12.5k 7 Oscillator 9 Oscillator R2 RT Osc. Adjust Prescaler (24) DAC 4 Counter (28) + Counter Control Logic + Regulate Output Control
X1
Overvoltage + + -
Power Up/Down Circuit
500
Stator
MB850 2.5 sec 10 sec Ground AlternateStator Configuration
Battery
UTC MC33092 LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD.
Notes:R1=R2=3.0k to 5.0k R3=10k to 15k RT=50k to 100k ** For 24-pin package.
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Standby Current vs. Temperature 0.8 Standby Current, ISB (mA) 0.7 0.6 0.5 0.4 0.3 0.2 -55 75 100 125 50 25 0 -25 Ambient Temperature, Ta (C) Reference Voltage vs. Temperature 2.2 Reference Voltage, Vref (V) TC Reference Voltage, Vref0 (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 1.26 1.25 1.24 1.23 1.22 1.21 1.20 -55 -25 0 25 50 75 100 125 ISB=Current from Vcc Supply Vcc=12.8V (see Figure 1) Vc1=0.5V (lgnition OFF) I(tot) VPin2=VPin12=1.5V mA VPin10=VPin11=VPin19(23**)=0V 1.8 1.7 Turn-on Voltage, Von (V) 1.6 1.5 1.4 1.3 1.2 1.1 1.0 -55 50 75 100 125 0 -25 25 Ambient Temperature, Ta (C) 0TC Reference Voltage vs. Temperature Vref0=Voltage at Pin 8 Vcc=12.8V (see Figure 1) Vc2=6.0V (S1 Colsed) VPin2=VPin12=1.5V VPin10=VPin11=VPin19(23**)=0V 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
2.1
2.0
1.9
1.8 -55
-25
0
25
50
75
100 125
Ambient Temperature, Ta (C) Oscillator Frequency vs. Timing Resistor 110 100 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) Note: ** For 24-pin package.
VPin2=VPin10=VPin12=VPin19(23**)=1.5V VPin11=0V
Ambient Temperature, Ta (C) Input Voltage vs. Output Duty Cycle 3.0 2.5 Input Voltage, Vinput (V) 2.0 1.96 1.95 1.94 1.93 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) VPin10=1.5V@>309Hz VPin11=0V, VPin19(23**)=1.5V
R=Resistance from Pin 7 to Ground f=Frequency at Pin 9
Resistance, RT (k)
0
10 20 30 40 50 60 70 80 90 100 Duty Cycle, DC (%)
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UTC MC33092 LINEAR INTEGRATED CIRCUIT
TYPICAL TEST CIRCUIT
Vcc 250 FB UV Vref Vref0 20 8 1 19 23** 24** 1.0k 14 Vcc1 13 Vcc3
MC33092
Lost Sense Circuit
Bandgap Reference Bias + -
Power Supply
Charge Pump
21** 17 Gate 22** 18 2.0k Source
Undervoltage
2 Sense (Remote) 12 Supply Reg (Local) 10 Phase X1
Signal Combiner and Switch
Low Pass Filter
Buff
+
Load Dump
Overvoltage + + Regulate Control Logic 12 Prescaler (24) 9 Oscillator Output DAC 4 Counter (28) Divide By (1/12/48) 11 8 Up/Down Counter (24)
Power Up/Down Circuit
3 Lamp 2.0k Coll. S1
vc1 vc2
+ + Counter
Output Control
Lamp Control Logic
4 Lamp Base 5 Gnd
7 RT
Oscillator
Rate
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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