Datenblatt-pdf.com


33099 Schematic ( PDF Datasheet ) - Freescale Semiconductor

Teilenummer 33099
Beschreibung Adaptive Alternator Voltage Regulator
Hersteller Freescale Semiconductor
Logo Freescale Semiconductor Logo 




Gesamt 18 Seiten
33099 Datasheet, Funktion
www.DFarteaeSshceeatl4eUS.ceommiconductor
Technical Data
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 by connecting pins 7 and 8 to ground.
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
• Vset 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) Vset
• Pb-Free Packaging Designated by Suffix Code EG
Document Number: MC33099
Rev. 6.0, 1/2007
33099
VOLTAGE REGULATOR
DW SUFFIX
EG SUFFIX (PB-FREE)
98ASB42567B
16-PIN SOICW
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC33099DW/R2
MC33099CDW/R2
MCZ33099EG/R2
MCZ33099CEG/R2
-40°C to 125°C
16 SOICW
16 SOICW
(Pb-FREE)
33099
PHASE
GATE
SOURCE
PHASE FILTER
FIELD
WINDING
IGN
LAMP DRAIN
BAT
REMOTE
LRC1
LRC2
AGND
GND
IGNITION
SWITCH
CHASSIS
Figure 1. 33099 Simplified Application Diagram
© Freescale Semiconductor, Inc., 2007. All rights reserved.






33099 Datasheet, Funktion
ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 3. Static Electrical Characteristics (continued)
Characteristics noted under conditions 7.0 V VSUP 18 V, -40°C TA 125°C, GND = 0 V unless otherwise noted. Typical
values noted reflect the approximate parameter means at TA = 25°C under nominal conditions unless otherwise noted.
Characteristic
Symbol
Min
Typ
Max Unit
Lamp Drain Short Circuit Threshold Voltage (7)
Lamp Drain Short Circuit Current
Lamp Drain ON Voltage
Ilamp = 0.4 A
VTDSC 1.8 2.25 2.85 V
IDSC
2.0 2.5 3.0 Amps
VD(SAT)
V
0.3 2.5
Lamp Drain-to-GATE Clamping Voltage
Lamp GATE Override Resistance
Lamp Driver Thermal Shutdown Temperature Limit (7)
GATE Drive Source Current
GATE Drive Sink Current
GATE Drive GATE-to-Source Clamping Voltage
Minimum Charge Pump GATE Drive Voltage
Vbat = Vsource = Vset
VDG
RLG
TLIM
IPU
IPD
VGS
VG(MIN)
240
400
10
21.5
48.48
4.6
185
300
480
12
23.4
55 V
– k
– °C
340 µA
560 µA
15 V
V
Source Short Circuit Threshold Voltage
Remote Input Resistance
Vrem = Vset
VTSSC 1.85 2.3 2.75 V
RREM
k
– 68 –
Phase Input Resistance
Vph = Vset
RPH
k
– 60 –
IGN Input Pull-Down Current
Vign = 1.25 V
IIGN µA
40 73 90
LRC Input Current
Vlrc = 0 V
ILRC
µA
35 45 55
Notes
7. Not 100% tested.
33099
6
Analog Integrated Circuit Device Data
Freescale Semiconductor

6 Page









33099 pdf, datenblatt
TYPICAL APPLICATIONS
PWM GATE frequency. Thus, the rates are accelerated by a
factor of 16.
LOW-PASS FILTER, DAC, AND ANALOG DUTY
CYCLE REGULATOR COMPARATOR
The output voltage Vo of combiners CB1 and CB2 is
coupled to an input of a 300 Hz low-pass filter (Rf, Cf) to
remove high-frequency components of system noise at Vbat
and thus associated with voltages Vls, or Vrs. The output of
the low-pass filter is coupled to a unity-gain buffer FB that
provides a filter buffer FB output.
The 4 MSBs of the 8-bit counter causes the DAC to
generate a 4-bit 395 Hz voltage waveform having
16 descending 1.75 mV steps, ramping from Vref to [Vref -
28 mV], where Vref is the 2.0 V reference voltage.
An analog duty cycle comparator (Cdc) compares the DAC
output voltage waveform to the voltage at the FB output (Vfb).
When voltage Vfb is less then voltage [Vref - 28 mV],
comparator Cdc outputs a logic [1], for a 100% duty cycle.
When voltage Vfb is greater than Vref, comparator Cdc
outputs a logic [0] for a 0% duty cycle. When (Vref -
28 mV) < Vfb < Vref, comparator Cdc outputs a duty cycle
defined by the High/Low output voltage ratio for each period
(about 2.54 ms) of the DAC output voltage waveform.
BASIC SYSTEM VOLTAGE REGULATION
From a system voltage regulation viewpoint, the voltages
Vrem and Vl from the Remote or Local connections,
respectively, are scaled to the Remote Sense and Local
Sense inputs as voltages Vrs and Vls respectively and
transferred to the FB output as voltage Vfb. Voltage Vfb is
compared to the DAC output voltage waveform to generate
the ON and OFF time of the analog duty cycle waveform.
When voltage Vfb is less than Vref - 28 mV, the output of
comparator Cdc is in a high state. This high state propagates
through an AND3 GATE, an OR1 GATE, and an AND4 GATE
to activate switch S3, generating a fully ON or High GATE
drive voltage. When voltage Vfb is greater than Vref, the
output of comparator Cdc is in a low state. This low state
propagates through the AND3 GATE, the OR1 GATE, and
the AND4 GATE to activate switch S3 to generate a fully OFF
or low GATE drive voltage. Assuming voltage Vref is 2.0 V
and Vfb = Vrs, and the local or remote input resistive scale
factor is 7.45, the external MOSFET provides a fully ON field
current when the system voltage is less than 7.45
(Vref - 28 mV), or 14.6 V. The field current is also fully OFF
when the system voltage is greater than 7.45 (Vref), or
14.9 V. When voltage Vfb is less than any portion of the DAC
waveform voltage, comparator Cdc output is high to produce
an ON field current. When voltage Vfb is greater than any
portion of the DAC waveform voltage, comparator Cdc output
is low to produce an OFF field current. Thus the system
feedback will regulate the PWM duty cycle of the field current
from 0% to 100% over about a 210 mV system regulation
voltage range (dVreg). The system voltage is centered at
14.8 V, where a 50% duty cycle field current results for an
average system load current, and the duty cycle regulation
frequency is (fosc/256), or 395 Hz. Since voltage Vref has a
negative TC, voltage Vset will also have a regulation voltage
temperature coefficient (TCVreg) of about -11 mV/°C.
INPUT PHASE AND FREQUENCY SWITCH
RESPONSE
The phase voltage Vph results from the alternator's stator
AC output voltage being applied to the PHASE input pin.
A phase detection threshold voltage (VTph) is approximately
4.0 V due to the 1.25 V phase reference voltage for the phase
comparator (Cph) and the 3.22 voltage ratio associated with
the phase input resistor divider. The phase input resistance
(Rph) is typically 60 k. A PHASE FILTER pin is coupled to
the input of Comparator Cph, providing for an external phase
filter capacitance when filtering of high frequency phase
noise is desired. A typical value of .003 µF to AGND provides
for an input phase 3.0 db roll-off frequency of about 10 kHz.
Comparator Cph also provides about 480 mV of hysteresis at
the PHASE input pin. Comparator Cph further provides a
phase signal binary output voltage having a phase frequency
of fph and is applied to digital frequency switches F1 and F2.
Switch F1 outputs a logic [1] when frequency fph is less then
phase detection frequency f1. Frequency f1 is equal to
frequency fmsb/8, or 49.3 Hz for a 101 kHz oscillator
frequency. Switch F2 outputs a logic [1] when the frequency
fph is greater then the low/high transition frequency f2.
Frequency f2 is equal to frequency 3fmsb/4, or 296 Hz for a
101 kHz oscillator frequency. These frequency switches are
used to define the Load Response Control region of
operation, an undervoltage at a high RPM fault condition, and
a low RPM fault condition due to a broken or loose belt.
LOAD RESPONSE CONTROL (LRC)
The LRC circuit consists of a digital duty cycle generator,
an analog/digital (A/D) duty cycle comparator and tracking
circuit, an up/down control switch, an up/down (U/D) counter,
a programmable divider (Np), and a multiplexer (MUX).
During normal operation, the LRC circuit becomes active and
generates digital duty cycle control of the GATE drive when
frequency fph is less than frequency f2 (f1 < fph < f2). The slow
LRC response becomes inactive and the analog duty cycle
controls the GATE drive when frequency fph is greater than
frequency f2 (f1 < fph < f2). During initial ignition and initial
engine start, the LRC response is in effect, independent of
frequency fph, until system voltage is regulating at voltage
Vset.
The digital duty cycle generator receives the 4 MSBs from
the 8-bit counter as input and generates 11 discrete digital
duty cycles on 11 output lines. The frequency of each duty
cycle waveform is about 395 Hz (fmsb), which results from the
MSB of the 8-bit division of the 101 kHz OSC clock
frequency. The minimum duty cycle on the first output line is
31.25% and the maximum duty cycle on the eleventh output
line is 93.75%. The duty cycle difference between each
incremental duty cycle is 6.25%. All 11 duty cycle generator
output lines are coupled as data inputs to the MUX.
33099
12
Analog Integrated Circuit Device Data
Freescale Semiconductor

12 Page





SeitenGesamt 18 Seiten
PDF Download[ 33099 Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
33099Adaptive Alternator Voltage RegulatorFreescale Semiconductor
Freescale Semiconductor

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche