L9407F ,CAR ALTERNATOR VOLTAGE REGULATORL9407FCAR ALTERNATOR VOLTAGE REGULATORPRODUCT PREVIEW■ FULLY MONOLITHIC DESIGN■ LOW SIDE FIELD DRIV ..
L9468 ,Alternator voltage regulator with protected diagnostic lamp driverAbsolute Maximum RatingsSymbol Parameter Value UnitV Thermal Supply Voltage (load dump) 40 VSI Outp ..
L9468N ,Alternator voltage regulator with protected diagnostic lamp driverFeatures■ FULLY MONOLITHIC DESIGN■ HIGH SIDE FIELD DRIVE■ THERMAL PROTECTION■ FIELD DRIVER SHORT CI ..
L9473 ,CAR ALTERNATOR VOLTAGE REGULATORBlock DiagramNTC4 178263Rev. 1May 2005 1/9L9473 Table 2. PIN DESCRIPTIONN° Pin Description1V Gener ..
L9474 , ALL SILICON VOLTAGE REGULATOR
L9484 ,CAR ALTERNATOR VOLTAGE REGULATORABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitOutput Current Capability INTERNALLY LIMITED APo ..
LC73872 ,DTMF ReceiverFeatures u d. Detects all 16 DTMF signals. -"i1"1-'un I-; T. Includes on-chip all filters required ..
LC73872 ,DTMF ReceiverFeatures u d. Detects all 16 DTMF signals. -"i1"1-'un I-; T. Includes on-chip all filters required ..
LC73872 ,DTMF ReceiverOrdering number : EN4998CMOS ICLC73872MDTMF ReceiverOverview Package DimensionsThe LC73872M is a DT ..
LC73872M ,DTMF ReceiverFeatures u d. Detects all 16 DTMF signals. -"i1"1-'un I-; T. Includes on-chip all filters required ..
LC7387M ,
DTMF ReceiverElectrical Characteristics at Ta = 25°C, VDD = 5 V, vss = 0 V, fosc = 4.194304 MHz, _ Ratings _Para ..
LC73881M ,DTMF Receiver LSIElectrical Characteristics at Ta = 25°C, V = 3 V, V = 0 V, f = 4.194304 MHzDD SS OSCParameter Symbo ..
L9407F
CAR ALTERNATOR VOLTAGE REGULATOR
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L9407FFebruary 2003 FULLY MONOLITHIC DESIGN LOW SIDE FIELD DRIVER THERMAL PROTECTION FIELD SHORT CIRCUIT PROTECTION PROTECTED DIAGNOSTIC LAMP DRIVER PROTECTED HIGH SIDE RELAY DRIVER COMPLEX DIAGNOSTICS LOAD RESPONSE CONTROL DFM OUTPUT (FIELD MONITOR)
DESCRIPTIONThe L9407F is a monolithic multifunction alternator
voltage regulator intended for use in automotive ap-
plication. It includes the control section, the field pow-
er stage, fault diagnostic circuit which drives a
warning lamp, and the protection against short cir-
cuits.
CIRCUIT OPERATIONThe alternator's voltage regulator performs the fol-
lowing main functions: 1) voltage regulation 2) protection 3) control fault diagnosis 4) load response control
VOLTAGE REGULATIONThe alternator voltage is compared with a reference
voltage in an amplifier, whose output determines the
switching frequency of output power MOS whose
current excites the coil of the alternator; as the regu-
lators are a self-oscillating type this frequency de-
pends on the whole system parameter set including
the alternator characteristics. The regulators have an
integrated filter in the voltage sensing path guaran-
teeing the correct behaviour of the devices also when
the rectifier diodes feature very high switching
spikes. The internal filtering allows the usage of the
device also with very long cables connecting the al-
ternator to the battery with an impedance so high to
cause a superimposed ripple on the alternator volt-
age higher than 5-6V. Consequently it doesn't need,
in the standard application, any external component.
Anyway an external application (2.2uF or 2.7uF)
must be inserted between A+ and ground when using
the device with very long cables.
PROTECTION It is present a protection against short circuits of the
lamp and the relay power drivers (D+) and of the field
power driver (DF), a thermal drivers shutdown pro-
tection and an overvoltage protection of D+ power
drivers.
DIAGNOSISThe circuit detects fault conditions related to the
phase and DF status and receives informations from
one of the three alternator phases. In order to prevent
spurious indications, fault warnings are not displayed
immediately but are dalayed by a fixed time.
LOAD RESPONSE CONTROLThe internal circuit regulates the soft start character-
istics (activated always at engine start) and the soft
attack characteristics.
PRODUCT PREVIEWCAR ALTERNATOR VOLTAGE REGULATOR
L9407F 2/11
PIN CONNECTION
PIN DESCRIPTION
ABSOLUTE MAXIMUM RATINGS
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L9407F
THERMAL DATA
ELECTRICAL CHARACTERISTCS (Tcase = -40ºC ÷ 150ºC; unless otherwise specified)
L9407F 4/11
ELECTRICAL CHARACTERISTCS (continued)(Tcase = -40ºC ÷ 150ºC; unless otherwise specified)
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L9407F
Figure 1. DF Monitor Electrical configuration
ELECTRICAL CHARACTERISTCS (continued)(Tcase = -40ºC ÷ 150ºC; unless otherwise specified)
L9407F 6/11
Figure 2. Application Diagram
Figure 3. L9407F THERMAL COMPENSATION (Vreg. )
