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| (R) VB027SP HIGH VOLTAGE IGNITION COIL DRIVER POWER I.C. TYPE VB027SP s s Vcl 300V Icl 9A Id(on) 130mA PRIMARY COIL VOLTAGE INTERNALLY SET COIL CURRENT LIMIT INTERNALLY SET s LOGIC LEVEL COMPATIBLE INPUT s DRIVING CURRENT QUASI PROPORTIONAL TO COLLECTOR CURRENT s DOUBLE FLAG-ON COIL CURRENT DESCRIPTION The VB027SP is a high voltage power integrated circuit made using the STMicroelectronics VIPowerTM technology, with vertical current flow power darlington and logic level compatible driving circuit. Built-in protection circuit for coil current limiting and collector voltage clamping allows the device to be used as smart, high 10 1 PowerSO-10TM voltage, high current interface in advanced electronic ignition system. BLOCK DIAGRAM Vd HVC INPUT DRIVER OVERTEMP. PROTECTION FLAG 1 QUASI PROP. BASE CURRENT + RSENSE FLAG FLAG 2 + REFERENCE June 1999 1/7 VB027SP ABSOLUTE MAXIMUM RATING Symbol HVc IC Vd Id VIN Tj T stg Parameter Collector voltage Collector current Driving stage supply voltage Driving circuitry supply current Input voltage Junction operating temperature Storage temperature Value Internally limited Internally limited 7 200 10 -40 to 150 -55 to 150 Unit V A V mA V C C THERMAL DATA Symbol Rthj-case Rthj-amb Parameter Thermal resistance junction-case Thermal resistance junction-ambient (MAX) (MAX) Value 1.12 62.5 Unit C/W C/W CONNECTION DIAGRAM (TOP VIEW) GND Vd N.C. INPUT DIAG 6 7 8 9 10 11 HVC 5 4 3 2 1 GND GND GND GND GND PIN FUNCTION No 1/5 Name GND GND Vd N.C. INPUT DIAG HVC 6(*) 7 8 9 10 TAB Function Emitter power ground Control ground Driving stage supply voltage Logic input channel Diagnostic output signal Primary coil output signal (*) Pin 1/5=Power GND, Pin 6=signal GND. Pin 6 must be connected to pins 1/5 externally. 2/7 1 VB027SP ELECTRICAL CHARACTERISTICS (VCC=13.5V; Vd=5V; Tj=25C; Rcoil=510m; Lcoil=7mH unless otherwise specified) Symbol Vcl Vcg(sat) Vcg(sat)td Id(off) Id(on) Vd Icl Icl(td) VINH VINL IINH VdiagH VdiagL IC(diag1) IC(diag1)td IC(diag2) IC(diag2)td td(off) tf(off) td(diag) tr(diag) tf(diag) Parameter High voltage clamp Power stage saturation voltage Power stage saturation voltage derating in temperature Power-off supply current Power-on supply current Driving stage supply voltage Collector current limit Collector current limit drift with temperature High level input voltage Low level input voltage High level input current High level diagnostic output voltage Low level diagnostic output voltage First threshold level collector current First threshold level collector current drift with temperature Second threshold level collector current Second threshold level collector current drift with temperature Turn-off delay time of output current Turn-off fall time of output current Delay time of diagnostic current Turn-on rise time of diagnostic current Turn-off fall time of diagnostic current Test Conditions VIN=0.4V; -40CTj 125C; IC=6A IC=6A; VIN=4V; Id=80mA IC=6A; VIN=4V; -40CTj125C; Id=85mA VIN=0.4V VIN=4V; IC=6A; -40CTj125C 4.5 VIN=4V (See note 1) See figure 3 HVC<2V IC<2mA; HVC=VCC VIN=4V REXT=22K (See figure 1) REXT=22K (See figure 1) 4.25 See figure 4 5.45 See figure 5 IC=5.5A IC=5.5A REXT=22K (See figure 1) REXT=22K (See figure 1) REXT=22K (See figure 1) 25 8 1 1 1 s s s s s 5.8 6.15 A 4.5 4 0 40 3.5 (*) 5.5 0.8 200 Vd 0.5 4.75 V V A V V A 8 8.5 Min 300 Typ 360 1.5 2 8 130 5.5 9 Max 400 Unit V V V mA mA V A Note 1: the primary coil current value Icl must be measured 1ms after desaturation of the power stage. (*) Vd - Vbe(on) 3/7 1 VB027SP PRINCIPLE OF OPERATION The VB027SP is mainly intended as high voltage power switch device driven by a logic level input and interfaces directly to a high energy electronic ignition coil. The input VIN of the VB027SP is fed from a low power signal generated by an external controller that determines both dwell time and ignition point. During VIN high (4V) the VB027SP increases current in the coil to the desired, internally set current level. When the collector current exceeds 4.5A, the diagnostic signal is turned high and it remains so, until the load current reaches 5.8A (second threshold). At that value, the diagnostic signal is turned low, and the C forces the VIN to the low state. During the coil current switch-off, the primary voltage HVC is clamped by a series of Zener diodes at an internally set value Vcl, typically 360V. The collector current sensed through the Rsense, is limited thanks to the "Current limiter" block that, as soon as the Icl level is reached, forces the darlington (using the "Driver" block) to limit the current provided. The transition from saturation to desaturation, coil current limiting phase, must have the ability to accommodate an overvoltage. A maximum overshoot of 20V is allowed. There can be some short period of time in which the output pin (HVC) is pulled below ground by a negative current due to leakage inductances and stray capacitances of the ignition coil. This can cause parasitic glitches on the diagnostic output. VB027SP has a built-in protection circuit that allows to lock the p-buried layer potential of the linear stage to the collector power, when the last one is pulled underground. FIGURE 1: Application circuit THERMAL BEHAVIOUR You can see in the block diagram of the VB027SP a box called overtemperature protection. The purpose of this circuit is to shift the current level at which the first diagnostic is activated down of about 1A. This information can be managed by the micro that can take the corrective action in order to reduce the power dissipation. This block is not an effective protection but just an overtemperature detection. The shift down of the first flag level cannot be present for temperatures lower than 125C. As an example of its behavior you can suppose a very simple motor management system in which the micro does just a simple arithmetic calculation to decide when to switch-off the device after the first flag threshold. EXAMPLE: IC(DIAG1) info after x ms (IC(DIAG1)=2.5A) Iswitch-off info after kx ms. As soon as the temperature rises over the overtemp threshold, the first diagnostic is shifted down to about 1.5A and, in this example, the switch-off current will be kx*1.5 / 2.5. OVERVOLTAGE The VB027SP can withstand the following transients of the battery line: -100V / 2ms (Ri=10) +100V / 0.2ms (Ri=10) +50V / 400ms (Ri=4.2 , with VIN=3V) 4/7 1 VB027SP FIGURE 2: Switching waveform VIN 2nd Threshold 1 st Threshold Icl DIAG FIGURE 3: Maximum Icl VS temperature FIGURE 4: IC(diag1) VS temperature FIGURE 5: IC(diag2) VS temperature 5/7 1 VB027SP PowerSO-10TM MECHANICAL DATA DIM. A A1 B c D D1 E E1 E2 E3 E4 e F H h Q 0 1.25 13.80 0.50 1.70 8 mm. MIN. 3.35 0.00 0.40 0.35 9.40 7.40 9.30 7.20 7.20 6.10 5.90 1.27 1.35 14.40 0.049 0.543 0.002 0.067 TYP MAX. 3.65 0.10 0.60 0.55 9.60 7.60 9.50 7.40 7.60 6.35 6.10 MIN. 0.132 0.000 0.016 0.013 0.370 0.291 0.366 0.283 0.283 0.240 0.232 0.050 0.053 0.567 inch TYP. MAX. 0.144 0.004 0.024 0.022 0.378 0.300 0.374 0.291 300 0.250 0.240 B 0.10 A B 10 = H = A F A1 = 6 = = = E = 1 5 = E2 E3 E1 E4 = = A = SEATING PLANE DETAIL "A" e 0.25 M B C Q D h = = D1 = = SEATING PLANE = A1 L DETAIL "A" 6/7 1 VB027SP 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 results 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 (c) 1998 STMicroelectronics - Printed in ITALY- All Rights Reserved. STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco The Netherlands- Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. 7/7 |
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