MC33099 Datasheet, PDF (1/20 Pages) Motorola, Inc – Adaptive Alternator Voltage Regulator

Freescale Semiconductor, Inc.
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Document order number: MC33099
Rev 4.0, 07/2004
Adaptive Alternator Voltage
Regulator
The 33099 is designed to regulate the output voltage in diode-rectified
alternator charging systems common to automotive applications. The 33099
provides either an analog or digital fixed frequency duty cycle (ON/OFF ratio)
control of an alternator’s field current. Load Response Control (LRC) of the
alternator field current is accomplished by selecting the duty cycle for
prevailing engine conditions to eliminate engine speed hunting and vibrations
caused by abrupt torque loading of the engine owing to sudden electrical loads
being applied to the system at low engine RPM. Four LRC rates are
selectable.
The 33099 uses a feedback voltage to establish an alternator field current
that is in harmony with system load currents. The output voltage is monitored
by an internal voltage divider scheme and compared to an internal voltage
ramp referenced to a bandgap voltage. This approach provides precision
output voltage control over a wide range of temperature, electrical loads, and
engine RPM.
Features
• External High-Side MOSFET Control of a Ground-Referenced Field
Winding
• LRC Active During Initial Start
• V_set at ±0.1 V @ 25°C
• <0.1 V Variation Over Engine Speeds of 2,000 to 10,000 RPM
• <0.2 V Variation Over 10% to 95% of Maximum Field Current
• Controlled MOSFET and Field Flyback Diode Recovery Characteristics
for Minimum RFI
• Trimmed Devices Available at 14.6 V and 14.8 V (typical) V_set
33099
ALTERNATOR VOLTAGE
REGULATOR
DW SUFFIX
CASE 751G-04
16-TERMINAL SOICW
ORDERING INFORMATION
Device
Temperature
Range (T_A)
Package
MC33099DW/R2
MC33099CDW/R2
-40°C to 125°C
16 SOICW
33099SSimimplpifileifdieAdppAlipcaptliiocnaDtiioangraDmiagram
33099
PHASE
GATE
SOURCE
PHASE FILTER
FIELD
WINDING
IGN
LAMP DRAIN
BAT
REMOTE
LRC1
LRC2
AGND
GND
IGNITION
SWITCH
CHASSIS
© Motorola, Inc. 2004
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