L9474 ALL SILICON VOLTAGE REGULATOR 1 ■ ■ ■ ■ ■ ■ ■ 2 Figure 1. Package Features High side field driver Thermal protection Field driver short circuit protection RVC interface Overvoltage protection Complex diagnostics Load Response Control Multiwatt8 Description Table 1. Order Codes 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. Part Number Package L9474 Multiwatt8 The setpoint voltage reference is selected by the ENGINE CONTROL UNIT via RVC protocol. Figure 2. Schematic Diagram TO ECM L VGO STARTER TO ECM FM ASVR F+ TO BCM BATTERY P STATOR LOADS FILTER FIELD (ROTOR) G C 82nF RECTIFIER BRIDGE D02AT508 March 2005 Rev. 1 1/8 L9474 Table 2. Pin Description N° Pin Function 1 P Phase sense input 2 L Warning terminal output and ECM PWM input 3 FM 4 RESERVED 5 GND 6 FILTER 7 F+ 8 VGO Field monitor output Reserved Regulation loop filter Field high side driver output Generator output sense and voltage supply to L9474 Table 3. Absolute Maximum Ratings Symbol Parameter VS Transient Supply Voltage (load dump) IO Output Current Capability Ptot VREV Value Unit 40 V Internally limited A 6 W -2.5 to -6 V Value Unit Power Dissipation (@Tj = 150°C, IField = 6A) Reverse Voltage (see fig.1) Figure 3. Pin Connection (Top view) 8 VGO 7 F+ 6 FILTER 5 GND 4 RESERVED 3 FM 2 L 1 P D02AT509 Table 4. Thermal Data Symbol Tj Junction temperature -40 to 150 °C Tstg Storage Temperature -50 to 150 °C Tsd Thermal Shut Down 175 ±15 °C 1.5 °C/W Rth j-case 2/8 Parameter Thermal Resistance Junction to Case L9474 Table 5. Electrical Characteristcs (Tj -35°C to +150°C unless otherwise specified) Symbol Parameter VOS Operating Supply Voltage ISB Stand-by Current 2 Test Condition Min. Typ. 8 VGO = 12.6V, Tcase -35 to +80°C VGO = 12.6 V, 80 <Tcase< +150 °C Max. Unit 161 V 400 µA 1 mA VSF Regulator Set-Point in Fault PWM signal loss VNB Generator output, no battery No battery, IOUT =2A to 50% max load TC Thermal compensation Driven by ECM VLR Load Regulation 6500 grpm, 10% to 95% load 300 mV VSR Speed Regulation 15A load, 2,000 to 10,000 grpm 100 mV VFON Output Saturation Voltage IF = 9A, Tcase < = 25°C 750 mV VFON Output Saturation Voltage IF = 6A, Tcase > 25°C 850 mV IFLIM Field limit current F shorted to gnd, Tcase < = 25°C 9 A F shorted to gnd, Tcase = 150 °C 6 A 13.8 Field Discharge Rectifier IF =6A, Tcase = 25 °C IR Diode Reverse Current VR = 16 V Oscillation frequency During LRC operation Minimum Field Duty-Cycle V(VGO) < VOV 3 Impedance @ FM pin Impedance between FM and F+ MFDC RFM VS+2 RVC or FLAT VF fOSC VS-2 V 340 400 V 1.85 V 1 mA 460 Hz 6.25 0.8 V % 2.5 KΩ 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 %. Figure 4. Reverse B+ Test Circuit + POWER SUPPLY 6V - POWER SUPPLY 2.5V - + VGO L P FILTER ASVR FM F C 82nF 1.8Ω FIELD G D02AT510 3/8 L9474 Figure 5. Setpoint Voltage vs. L terminal signal Table 6. Diagnostic (Tj -35°C to +150°C unless otherwise specified) Symbol VOV Parameter Test Condition L Saturation Voltage TDELAY Fault Indication Delay Time Typ. 16.5 Overvoltage4 VLSAT Min. IL = 50 mA 0.935 1.1 Max. Unit 22 V 1.35 V 1.265 s Note: 4. When the Vgo voltage overcomes this value the MFDC is cancelled 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 Delay 1. Key-on (RVC PWM signal acknowledgement) No 2. Phase Voltage < VP2 AND VGO < setpoint Yes 4/8 L9474 Table 8. Regulation Features Symbol VLON Parameter Lamp term turn on 5 threshold ILON VP1 Initiation of regulation detection phase voltage threshold 6 VP2 Fault detection phase voltage threshold 7 IP Sinking current @ P terminal fIFR FSDF Test Condition Min. Typ. Max. Unit fL = 128Hz +/-5% 0.65 0.9 1.15 V VL = 0.65V 0.3 1.5 mA IP = 1mA (sinking current) VP = 1.5V 0.35 7 8 9 V 0.5 1 1.8 mA Initiation of field regulation frequency Field Strobe Duty Factor LRC Load Response Control rate 8 fLRC LRC transition frequency ∆gnd Difference between ECM & Alternator ground @ "power up" with fPHASE < fIFR LRC disabled above this value V 72 Hz 12.5 % 2.125 2.5 2.875 s 263 310 357 Hz 0.2 V -0.2 Notes: 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. mm MIN. TYP. inch MAX. MIN. TYP. MAX. A 5 0.197 B 2.65 0.104 C 1.6 0.063 E 0.49 0.55 0.019 0.022 F 0.78 0.85 0.030 0.033 F1 0.68 0.75 0.027 G 2.40 2.54 2.68 0.094 0.10 0.105 G1 17.64 17.78 17.92 0.69 0.70 0.71 H1 19.6 0.029 0.772 H2 20.2 L 20.35 L2 17.05 L3 L4 OUTLINE AND MECHANICAL DATA 0.795 20.65 0.80 17.20 17.35 0.67 0.81 17.25 17.5 17.75 0.679 0.689 0.699 10.3 10.7 10.9 0.406 0.421 0.429 0.68 0.68 L5 15.45 15.75 0.61 L5* 15.05 15.35 0.59 0.62 0.60 L7 2.65 2.9 0.104 0.114 S 1.9 2.6 0.075 0.102 S1 1.9 2.6 0.075 0.102 U 0.40 0.55 0.015 0.022 Z 0.70 0.85 0.028 0.034 Dia1 3.65 3.85 0.144 0.152 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 Revision March 2005 1 Description of Changes First Issue 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. 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