MC33099 Datasheet PDF - Motorola => Freescale

MC33099 View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

MC33099

ALTERNATOR VOLTAGE REGULATOR

Motorola => Freescale

MC33099 Datasheet PDF : 13 Pages

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MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Order Number: MC33099/D

Rev. 2, 06/2001

Advance Information

Alternator Voltage Regulator

The MC33099 is specifically designed for regulation of an automotive

system voltage using diode rectified alternator charging systems commonly

found in automotive applications. The MC33099 provides either an analog or

digital duty cycle control of an ON/OFF ratio of an alternator field current at a

fixed frequency. This provides for a Load Response Control (LRC) of the

alternator field current at low engine RPM to eliminate engine speed hunting

and vibration due to abrupt torque loading of the engine when a sudden

electrical load is applied to the system. Four LRC rates are selectable using

a combination of Pins 7 and 8 being connected to ground.

The MC33099 provides a regulated voltage feedback system to activate

the alternator field current in response to system load current. The system

voltage is monitored and level shifted using internal resistor voltage dividers,

to compared the level shifted system voltage to an internal voltage ramp

referenced to a bandgap reference voltage. The MC33099 regulates the

system voltage to 14.8 V by generating a Pulse Width Modulation (PWM)

voltage waveform at the gate of an external MOSFET to provide an average

alternator field coil current as a function of the internal voltage comparison.

• Provides High Side MOSFET Control of a Ground Referenced Field

Winding

• Forced Load Response Control (LRC) at Low Engine RPM Due to

Abrupt System Load Currents

• Four User Programmable LRC Rates From 1.8 Seconds to 7.4 Seconds

• LRC Response During Initial Start

• Regulation Voltage Range is ±0.1V at a 14.8 V Regulation Voltage

@ 25°C

• <0.1 V Variation Over Engine Speed Range From 2000 to 10,000 RPM

• <0.2 V Variation Over 10% to 95% of Maximum Alternator Field Current

• Minimum Duty Cycle of 3.1% for System Load Currents as Low as

1.0 A.

• PWM Fixed Operating Frequency of 395 Hz

• Internal Level Shifting of External System Voltages

• Internal Lamp Driver with Short Circuit, Current Limit, Thermal Limit and

Load Dump Protection

• Fault Protection for a Field Short to Ground

• Load Dump Protection of Lamp Driver, Field Control Devices, and Loads

• Fault Detection of Undervoltage, Overvoltage, Phase Loss (Lose or

Broken Belt) and High Remote Sense Resistance (lose or corroded

sense wire)

• Controlled MOSFET and Field Flyback Diode Recovery Characteristics

for Minimum RFI

• <1.5 mA Standby Current From Battery @ 25°C

• <2.5 mA Standby Current From Battery @125°C

MC33099

ALTERNATOR VOLTAGE

REGULATOR

SEMICONDUCTOR

TECHNICAL DATA

DW SUFFIX

PLASTIC PACKAGE

CASE 751G

(SO–16W)

PIN CONNECTIONS

Gate 1

Battery 2

Gnd 3

Lamp Drain 4

Lamp Gate 5

Ignition 6

LRC2 7

LRC1 8

16 Source

15 Phase

14 N.C.

13 Phase Filter

12 LRC Test

11 N.C.

10 Remote

9 AGnd

(Top View)

ORDERING INFORMATION

Device

Operating

Temperature Range Package

PC33099DW TA = – 40°C to 125°C SO–16W

This document contains information on a new product. Specifications

and information herein are subject to change without notice.

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