MC33099DW/R2 View Datasheet(PDF) - Motorola => Freescale
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Description
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MC33099DW/R2 Datasheet PDF : 18 Pages
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TYPICAL APPLICATIONS
INTRODUCTION
TYPICAL APPLICATIONS
INTRODUCTION
The 33099 is an alternator voltage regulator designed with
internal level shifting resistors to control the voltage in a 12 V
automotive system that uses a three-phase alternator with a
rotating field winding. The system shown in Figure 4 includes
an alternator with its associated field coil, stator coils and
rectifiers, an automotive battery, a fault indicator lamp, an
ignition switch, a field flyback diode, and the 33099.
PHASE
PHASE
FILTER
REMOTE
Vrem
Vrs
CB1
Vl
Local
Vls
Local
Sense
0.6 V
Crs
LB
R1
R2
RF
Vo
Low
Pass Cf
S1 R4
CB2
R5
R3
Cph
S2
Vhvl
F1
DAC
1.25 V
F2
101 kHz
Osc
To
Logic
P16
4 LSB 4 MSB
8-Bit Counter
P256
A/D Duty Cycle u/d
Comparator
& Tracking
Circuit
Up/Down
Control
Switch
Digital
Duty Cycle
Generator
U/D
Counter
u/d
Np
BATT
Charge
Internal
Pump
VDD
V reg
Regulator
Regulator
and Bias
FB
Vfb
Bandgap
Reference
Current
Regulator
Vg
Regulator
(OTC)
1.25 V
Vref
(2.0 V)
VDD
(5.0 V)
UV
Cuv
1.25 V
Min Duty
Cycle
Generator
LD
Over
Voltage
OR1
Gate
Polling
Circuit
Css
lpu
A
S3
N
GATE
D
4
Battery
Z1
VTssc lpd
Detector OV
Ign
Delay
SOURCE
Cdc
Circuit
IGN
Vdac
1
2
10
A
11
N
MUX
D
3
A
N
D
1
A
N
OR2
D
2
Lamp
Polling
Circuit
Cign
Drain
Polling
Circuit
1.25V
VTigm Iign
Cds
Lamp
Z2
Driver
Circuit
Battery
VTdsc
LAMP
DRAIN
LAMP
GATE
Thermal
Limit
Detector
Dtl
Current
Limit
Detector
Rs
LCR TEST LCR1 LRC2
AGND
GND
Figure 4. 33099 Simplified Application
The 12 V system voltage (VBAT) is connected to a
REMOTE input by a remote wire, which provides the IC
regulator with an external Kelvin connection directly to the
battery to provide REMOTE voltage, Vrem. The system
voltage at the BAT pin is also sensed by an internal Local IC
connection as Local voltage Vl. The Local connection is
provided in the event the remote wire or remote connection
becomes faulty such as being resistive, an open, or shorted
to ground.
The PHASE input is normally connected to a tap on one
corner of the alternator's stator winding, which provides an
AC phase voltage (Vph) for the IC to determine the rotational
frequency (fph) of the alternator rotor. Two frequency
comparators (F1 and F2) monitor voltage Vph to determine a
Analog Integrated Circuit Device Data
Freescale Semiconductor
phase rotation detection frequency (f1) and a Low/ High RPM
transition phase frequency (f2), respectively. A PHASE
FILTER pin is provided for externally providing a filter
capacitance for filtering phase input noise.
The regulated DC system set voltage (Vset) is achieved by
employing feedback to compare a ratioed value of Vset to an
internal IC bandgap voltage reference having a negative
temperature coefficient (TC). The GATE drive of an external
N-channel MOSFET is regulated by the IC to control the field
current in the alternator field coil as an alternating ON or OFF
state dependent on load current conditions affecting voltage
Vset. The external MOSFET receives GATE-to-source
voltage drive from between the GATE and SOURCE output
pins of the IC. The GATE-to-source voltage is a Pulse Width
33099
9
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