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| L9468 ALL SILICON VOLTAGE REGULATOR 1 Features 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 Figure 1. Package Multiwatt8 Table 1. Order Codes Part Number L9468N Package Multiwatt8 2 Description 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. The L9468 is a monolithic multifunction generator Voltage regulator intended for use in automotive apFigure 2. Block Diagram S L FM VGO FAULT LAMP KEY SW TO ECM STARTER ASVR F+ FIELD (ROTOR) RECTIFIER BRIDGE P STATOR BATTERY LOADS G D02AT503 April 2005 Rev. 1 1/8 L9468 Table 2. Pin Description N 1 2 3 4 5 6 7 8 Pin VGO F+ G S GND FM L P Function Generator output sense and voltage supply to L9468 Field high side driver output Ground for L9468 Battery sense input Connected to the Tab through the frame Field monitor output Lamp terminal low side driver Phase sense input Table 3. Absolute Maximum Ratings Symbol VS IO Ptot VR Parameter Thermal Supply Voltage (load dump) Output Current Capability Total Power Dissipation (@Tcase = 150C, IFIELD = 5A) Reverse Voltage (see figure 1) Value 40 internally limited 6 -2.5/-6 Unit V A W V Figure 3. Pin Connection (Top view) 8 7 6 5 4 3 2 1 Tab connected to pin 5 D02AT504 P L FM GND S G F+ VGO Table 4. Thermal Data Symbol Rth j-case Tstg Rth sd Rth j-case Parameter Thermal Resistance junction-case Storage Temperature Thermal Shut-Down Thermal Resistance junction -case Value -45 to 160 -50 to 175 175 15 1.5 Unit C C C C/W 2/8 L9468 Table 5. Electrical Characteristcs (Tcase = -35C to 150C unless otherwise specified) Symbol VOS VOS ISB ISB VS VNB TC VLR VSR VFON VFON IFLIM VF IR fOSC MFDC RFM Notes: 1. 20 Volts is the maximum operating voltage because above this level the FAILSAFE feature shuts down the output stage. 2. Thermal slopes are shown in fig. 2 3. 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 %. Parameter Operating Supply Voltage Operating Supply Voltage Stand-by Current Stand-by Current Regulator Set-Point Generator output, no battery Thermal compensation Load Regulation Speed Regulation Output Saturation Voltage Output Saturation Voltage Field limit current Field Discharge Rectifier Diode Reverse Current Oscillation frequency Minimum Field Duty-Cycle Impedance @ FM pin Test Condition Tcase = +25 to +150 C Tcase = - 40 to +25 C VGO = 12.6V, Tcase -35 to +80 C VGO = 12.6 V, 80C Min. 8 10 Typ. Max. 20 1 20 400 1 Unit V V A mA V V V 14.1 VS-2 VS+2 300 100 750 850 8.3 5 1.85 1 340 400 6.25 5 15 460 mV mV mV mV A A V mA Hz % K Impedance between FM and F+ Figure 4. Reverse B+ Test Circuit + POWER SUPPLY 6V - - POWER SUPPLY 2.5V + INCANDESCENT LOAD 14 L S FM I VGO P ASVR F 1.8 FIELD G D02AT505 3/8 L9468 Figure 5. Setpoint Voltage vs. Tcase Temperature VS (V) 15.8 15.6 15.4 15.2 15.0 14.8 14.6 14.4 14.2 14.0 13.8 13.6 13.4 13.2 13.0 13.35 14.55 14.35 14.1 14 13.65 15 14 .8 D02AT506 15.9 15.45 15.05 13.85 -40 -20 0 20 40 60 80 100 120 Tcase(C) Table 6. Diagnostic (Tcase -35C to +150C unless otherwise specified) Symbol VFSO VFSL VFSH IS VUV VOV VLSAT VLSAT TDELAY Notes: 4. When Fail Soft operation is detected, regulation sensing will switch from the "S" terminal to the VGO terminal. 5. 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. Parameter Failsafe Output Voltage Switch sensing from S to VGO Switch sensing from VGO to S Sink current @ "S" pin Undervoltage Overvoltage Lamp saturation voltage Lamp on Voltage 5 Fault Indication Delay Time IL = 0.5A Test Condition Voltage measured at VGO "S" Voltage falling into Fail Soft 4 "S" Voltage rising out of Fail Soft VS = 14 V grpm > 3100 15% Min. 20 4 Typ. 20.48 4.2 7.6 Max. 21 Unit V V 8 2.5 11.6 VS+1.55 1.4 5 1.265 V mA V V V V s 1 10.95 VS+1 1.75 11.35 VS+1.25 1.33 3.8 IL < 0.5A,VGO=open, Tcase = 25C 0.935 1.1 4/8 L9468 3 FAULT The following table lists the conditions that cause the fault lamp driver to function. To prevent lamp flicker, specific faults are required to be present for TDELAY seconds before the lamp driver is activated. This delay is indicated in the table. Table 7. Conditions 1. Key-on (wiring check), lamp stays on for 1 0.15 sec regardless other conditions 2. VGO / S> VOV 3. VGO / S < undervoltage threshold voltage AND Phase frequency > fLRC 4. Phase Voltage < VP2 AND VGO / S < setpoint 5. Phase frequency < fIFR 6. No connection between Battery and VGO 7. FAILSAFE Delay No Yes Yes Yes Yes No Yes Table 8. Regulation Features Symbol VLON ILON VP1 Parameter Lamp term turn on threshold 6 Lamp term current sensitivity Initiation of regulation detection phase voltage threshold 7 Fault detection phase voltage threshold 8 Sinking current @ P terminal Initiation of field regulation frequency Field Strobe Duty Factor Load Response Control rate 9 LRC transition frequency "L" term. Cut-Back Setpoint LRC is enabled below this value "L" = 0V, "I" = 0V 10 @ "power up" with fPHASE < fIFR 2.125 263.5 V S20% VP = 1.5V VL = 1 V to Vsp IP = 1mA (sinking current) Test Condition Min. 0.8 0.09 2.5 3 Typ. 1 Max. 1.15 0.78 3.5 Unit V mA V VP2 7 8 9 V IP fIFR FSDF LRC fLRC VLCB Notes: 6. 0.5 53.04 1 61 31.25 2.5 310 V S25% 1.8 70.15 mA Hz % 2.875 356.5 VS-30% s Hz V 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. 7. This threshold on the phase signal is used to detect the phase frequency, fIFR, for the Initiation of field regulation. 8. This threshold on the phase signal is used to sense the presence of the phase for fault detection purposes. 9. This is the time duration the L9468 takes to rump up from 0 % to 100% duty cycle in response to an increased load on the enerator. The LRC ratio is set 1:4 and the Vreg comparator status is latched at foundamental frequency rate. 10. Cut-back occurs when both the "L" and "I" terminals are LOW . If the "I" terminal is disconnected it will assume a logic LOW allowing the "L" terminal to perform the function alone. In cut-back, to prevent the loss of phase signal, a 31.25% duty cycle is applied to field output when phase drops below Vp2 5/8 L9468 4 Package Information Figure 6. Multiwatt 8 Mechanical Data & Package Dimensions DIM. A B C E F F1 G G1 H1 H2 L L2 L3 L4 L5 L5* L7 S S1 U Z Dia1 20.35 17.05 17.25 10.3 15.45 15.05 2.65 1.9 1.9 0.40 0.70 3.65 17.20 17.5 10.7 0.49 0.78 0.68 2.40 17.64 19.6 20.2 20.65 17.35 17.75 10.9 15.75 15.35 2.9 2.6 2.6 0.55 0.85 3.85 0.80 0.67 0.679 0.406 0.61 0.59 0.104 0.075 0.075 0.015 0.028 0.144 0.68 0.689 0.421 2.54 17.78 mm MIN. TYP. MAX. 5 2.65 1.6 0.55 0.85 0.75 2.68 17.92 0.019 0.030 0.027 0.094 0.69 0.772 0.795 0.81 0.68 0.699 0.429 0.62 0.60 0.114 0.102 0.102 0.022 0.034 0.152 0.10 0.70 MIN. inch TYP. MAX. 0.197 0.104 0.063 0.022 0.033 0.029 0.105 0.71 OUTLINE AND MECHANICAL DATA Multiwatt8 (Floating) L5 = with wedged frame std. L5* = with wedged frame anchor holes. * 0043674 F 6/8 L9468 5 Revision History Table 9. Revision History Date April 2005 Revision 1 First Issue Description of Changes 7/8 L9468 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners (c) 2005 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 8/8 |
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