MC33092 Datasheet, PDF (1/10 Pages) Unisonic Technologies – LINEAR INTEGRATED CIRCUIT

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Alternator Voltage Regulator
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. The MC33092 provides load
response control of the alternator output current to eliminate engine speed
hunting and vibration due to sudden electrical loads which cause abrupt
torque loading of the engine at low RPM. Two load response rates are
selectable using Pin 11. The timing of the response rates is dependent on
the oscillator frequency.
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.
• Forced Load Response Control (LRC) with Heavy Load Transitions
at Low RPM
• Capable of Regulating Voltage to ± 0.1 V @ 25°C
• 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
• < 2.0 mA Standby Current from Battery @ 25°C
• < 3.0 mA Standby Current from Battery Over Temperature Range
• Optional 2.5 or 10 sec. LRC Rate Control (Osc. Freq. = 280 kHz)
• Undervoltage, Overvoltage and Phase Fault (Broken Belt) Detection
MC33092
ALTERNATOR VOLTAGE
REGULATOR
SEMICONDUCTOR
TECHNICAL DATA
20
1
DW SUFFIX
PLASTIC PACKAGE
CASE 751D
(SO–20L)
PIN CONNECTIONS
Simplified Block Diagram
FB UV Vref
1 19 20
Vref O
8
VCC1
14
2
Sense
(Remote)
Lost
Sense
Circuit
MC33092
Signal
Combiner
and Switch
Low
Pass _Buff
Filter
Bandgap
Reference
Bias
Power
Supply
Undervoltage
Load Dump
12
X1
Supply
Reg
(Local)
10
Phase
Counter
7
Osc.
Adjust
Oscillator
Prescaler
(24)
9
Oscillator
Overvoltage
Regulate
12
DAC
Counter ⁴
(28)
Control
Logic
Divide By
(1/12/48)
Output
Control
8
Up/Down
Counter
(24)
11
Rate
MOTOROLA ANALOG IC DEVICE DATA
VCC3
13
Charge
Pump
Power
Up/Down
Circuit
17
Gate
18
Source
3
Lamp
Coll.
Filter Buffer 1
Remote Sense 2
Lamp Collector 3
Lamp Base 4
5
Gnd
6
Oscillator
Adjust
7
Vref O 8
Oscillator ₉
Phase 10
20 Vref
19 Undervoltage
18 Source
17 ^Gate
16 NC
15 ^Gnd
14 ^VCC1
13 VCC3
12
Supply
Regulation
11 Rate
(Top View)
Lamp
Control
Logic
4
Lamp
Base
5
Gnd
6 15
Gnd
ORDERING INFORMATION
Device
Operating
Temperature Range Package
MC33092DW TA = – 40° to +125°C SO–20L
© Motorola, Inc. 1996
Rev 0
1