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| L9474 ALL SILICON VOLTAGE REGULATOR 1 Features High side field driver Thermal protection Field driver short circuit protection RVC interface Overvoltage protection Complex diagnostics Load Response Control Figure 1. Package Multiwatt8 2 Description Table 1. Order Codes Part Number L9474 Package Multiwatt8 The L9474 is a monolithic multifunction generator Voltage regulator intended for use in automotive applications. 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. Figure 2. Schematic Diagram The setpoint voltage reference is selected by the ENGINE CONTROL UNIT via RVC protocol. TO ECM L VGO STARTER FM F+ TO BCM TO ECM ASVR P STATOR BATTERY FIELD (ROTOR) G FILTER C 82nF RECTIFIER BRIDGE D02AT508 LOADS March 2005 Rev. 1 1/8 L9474 Table 2. Pin Description N 1 2 3 4 5 6 7 8 Pin P L FM RESERVED GND FILTER F+ VGO Regulation loop filter Field high side driver output Generator output sense and voltage supply to L9474 Phase sense input Warning terminal output and ECM PWM input Field monitor output Reserved Function Table 3. Absolute Maximum Ratings Symbol VS IO Ptot VREV Parameter Transient Supply Voltage (load dump) Output Current Capability Power Dissipation (@Tj = 150C, IField = 6A) Reverse Voltage (see fig.1) Value 40 Internally limited 6 -2.5 to -6 Unit V A W V Figure 3. Pin Connection (Top view) 8 7 6 5 4 3 2 1 D02AT509 VGO F+ FILTER GND RESERVED FM L P Table 4. Thermal Data Symbol Tj Tstg Tsd Rth j-case Junction temperature Storage Temperature Thermal Shut Down Thermal Resistance Junction to Case Parameter Value -40 to 150 -50 to 150 175 15 1.5 Unit C C C C/W 2/8 L9474 Table 5. Electrical Characteristcs (Tj -35C to +150C unless otherwise specified) Symbol VOS ISB Parameter Operating Supply Voltage Stand-by Current 2 VGO = 12.6V, Tcase -35 to +80C VGO = 12.6 V, 80 Notes: 1. 16 Volts is the maximum operating voltage. 2. Stand-by current measured with L, FM open; F connected to gnd; P open or tied to gnd. 3. When the voltage sensed at VGO terminal is above VOV the Minimum Field Duty-Cycle will be 0 %. Test Condition Min. 8 Typ. Max. 161 400 1 Unit V A mA V 13.8 VS-2 VS+2 RVC or FLAT 300 100 750 850 9 6 1.85 1 340 400 6.25 0.8 2.5 460 V V mV mV mV mV A A V mA Hz % K Field Discharge Rectifier Diode Reverse Current Oscillation frequency Minimum Field Duty-Cycle Impedance @ FM pin IF =6A, Tcase = 25 C VR = 16 V During LRC operation V(VGO) < VOV 3 Impedance between FM and F+ Figure 4. Reverse B+ Test Circuit POWER SUPPLY 6V POWER SUPPLY 2.5V + - - + VGO L P FILTER ASVR FM F C 82nF 1.8 FIELD G D02AT510 3/8 L9474 Figure 5. Setpoint Voltage vs. L terminal signal Table 6. Diagnostic (Tj -35C to +150C unless otherwise specified) Symbol VOV VLSAT TDELAY Note: 4. When the Vgo voltage overcomes this value the MFDC is cancelled Parameter Overvoltage4 L Saturation Voltage Fault Indication Delay Time Test Condition Min. 16.5 Typ. Max. 22 1.35 Unit V V s IL = 50 mA 0.935 1.1 1.265 Table 7. FAULT The following table lists the conditions that cause the fault driver to function (L terminal now switching be-tween 0V and VLSAT. To prevent L flicker, specific faults are required to be present for TDELAY seconds be-fore the fault driver is activated. This delay is indicated in the table. Conditions 1. Key-on (RVC PWM signal acknowledgement) 2. Phase Voltage < VP2 AND VGO < setpoint Delay No Yes 4/8 L9474 Table 8. Regulation Features Symbol VLON ILON VP1 Initiation of regulation detection phase voltage threshold 6 Fault detection phase voltage threshold 7 Sinking current @ P terminal Initiation of field regulation frequency Field Strobe Duty Factor Load Response Control rate 8 LRC transition frequency Difference between ECM & Alternator ground LRC disabled above this value @ "power up" with fPHASE < fIFR 2.125 263 -0.2 VP = 1.5V Parameter Lamp term turn on 5 threshold Test Condition fL = 128Hz +/-5% VL = 0.65V IP = 1mA (sinking current) Min. 0.65 0.3 0.35 Typ. 0.9 Max. 1.15 1.5 Unit V mA V VP2 7 8 9 V IP fIFR FSDF LRC fLRC gnd Notes: 0.5 1 72 12.5 2.5 310 1.8 mA Hz % 2.875 357 0.2 s Hz V 5. A 128Hz PWM signal applied to L input, higher than this threshold, will turn on the device. 6. This threshold on the phase signal is used to detect the phase frequency, fIFR, for the Initiation of field regulation. 7. This threshold on the phase signal is used to sense the presence of the phase for fault detection purposes. Furthermore, to prevent the loss of phase signal, a 31.25% duty cycle is applied to field output when phase drops below Vp2 and Vgo is above setpoint. 8. This is the time duration the L9474 takes to rump up from 0 % to 100% duty cycle in response to an increased load on the generator. The LRC ratio is set 1:4 and the Vreg comparator status is latched at foundamental frequency rate. 5/8 L9474 3 Package Information Figure 6. Multiwatt8 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 L9474 4 Revision History Table 9. Revision History Date March 2005 Revision 1 First Issue Description of Changes 7/8 L9474 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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