L9468N ,Alternator voltage regulator with protected diagnostic lamp driverFeatures■ FULLY MONOLITHIC DESIGN■ HIGH SIDE FIELD DRIVE■ THERMAL PROTECTION■ FIELD DRIVER SHORT CI ..
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L9468-L9468N
Alternator voltage regulator with protected diagnostic lamp driver
L9468
1Features FULLY MONOLITHIC DESIGN HIGH SIDE FIELD DRIVE THERMAL PROTECTION FIELD DRIVER SHORT CIRCUIT
PROTECTION PROTECTED DIAGNOSTIC LAMP DRIVER REDUCED OUTPUT MODE COMPLEX DIAGNOSTICS LOAD RESPONSE CONTROL
DescriptionThe L9468 is a monolithic multifunction generator
Voltage regulator intended for use in automotive ap-
plications.
This device regulates the output of an automotive
generator by controlling the field winding current by
means of a variable frequency PWM high side driver.
ALL SILICON VOLTAGE REGULATOR
Figure 2. Block Diagram
L9468
Table 2. Pin Description
Table 3. Absolute Maximum Ratings
Figure 3. Pin Connection (Top view)
Table 4. Thermal Data
L9468Notes: 20 Volts is the maximum operating voltage because above this level the FAILSAFE feature shuts down the output stage. Thermal slopes are shown in fig. 2 This value is present when the voltage sensed at the " S" or "VGO" terminal is between VUV and VOV. When the voltage sensed
at the "S" or "VGO" terminal is above VOV the Minimum Field Duty-Cycle will be 0 %.
Figure 4. Reverse B+ Test Circuit
Table 5. Electrical Characteristcs (Tcase = -35°C to 150°C unless otherwise specified)
L9468
Figure 5. Setpoint Voltage vs. Tcase Temperature
Table 6. Diagnostic (Tcase -35°C to +150°C unless otherwise specified)Notes: When Fail Soft operation is detected, regulation sensing will switch from the "S" terminal to the VGO terminal. This condition can happen when the connection between the battery and VGO or the output terminal of the generator is broken.
In this case the delay of 1.1 seconds is not required.
L9468
3FAULTThe following table lists the conditions that cause the fault lamp driver to function. To prevent lamp flicker, spe-
cific faults are required to be present for TDELAY seconds before the lamp driver is activated. This delay is
indicated in the table.
Table 7.
Table 8. Regulation FeaturesNotes: Lamp and Ignition are cooperative. Either can turn on the device when the other is left open or held low. When both go below
their minimum thresholds the L9468 goes into "L" Terminal Control (LTC). The L9468 will remain in LTC until the phase (P) voltage
drops below VP2 and the frequency drops below fIRF at the VP1 threshold then the L9468 is disabled. This threshold on the phase signal is used to detect the phase frequency, fIFR, for the Initiation of field regulation. This threshold on the phase signal is used to sense the presence of the phase for fault detection purposes.
L9468 Package Information
Figure 6. Multiwatt 8 Mechanical Data & Package Dimensions
