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| VB024 HIGH VOLTAGE IGNITION COIL DRIVER POWER IC TYPE VB024 s s s s s V CL 400 V IC 8A Id 100 mA PRIMARY COIL CURRENT INTERNALLY SET PRIMARY COIL VOLTAGE INTERNALLY SET AUTOMATIC SHUT-OFF AT MAX CURRENT LOGIC LEVEL COMPATIBLE INPUT DIGITAL SIGNAL FEEDBACK TO INDICATE A PREDETERMINED CURRENT LEVEL DESCRIPTION The VB024 is a high voltage integrated circuit made using SGS-THOMSON VIPower thecnology, with vertical current flow power darlington and logic level compatible driving circuit. The device performs the following functions: power stage for driving the primary side of the ignition coil, digital signal feedback to the control IC to indicate a predetermined current level, automatic shut-off at maximum current, self clamping for voltage flyback and logic level input. ISOWATT7 BLOCK DIAGRAM September 1993 1/8 VB024 ABSOLUTE MAXIMUM RATING Symbol HV C IC Vd Id V in Vs Is Tj T stg Collector Voltage Collector Current Driving Stage Supply Voltage Driving Circuitry Supply Current Maximum Input Voltage Control Circuitry Supply Voltage Control Circuitry Supply Current Operating Junction Temperature Storage Temperature Range Parameter Value Internally Limited Internally Limited 16 600 10 8 200 -40 to 150 -55 to 150 Unit V A V mA V V mA o o C C THERMAL DATA R thj-cas e Rthj- amb Thermal Resistance Junction Case Thermal Resistance Junction Ambient (MAX) (MAX) 2.5 30 o o C/W C/W CONNECTION DIAGRAM PIN FUNCTION No 1 2 3 4 5 6 7 NAME GND LATCH ENABLE Vd OUT Vs INPUT FLAG Output of A Logic Signal When Ic Is Greater Than 3 A FUNCTION Emitter Power and Control Ground Enables Of The Latch Circuitry Which Turn Off The Driver Supply Voltage For The Power Stage Output to The Primary Coil Supply Voltage For The Control Stage 2/8 VB024 ELECTRICAL CHARACTERISTICS (Vb = 12 V; Vs = 5 V Regulated; T j = 25 oC; Rcoil = 500 m; Lcoil = 6mH unless otherwise specified) Symbol V cl V ce(sat) I s(on) Vs I d(on) Vd I diag V inH V inL I inH V pos V neg V hys Ic (max) t off V diagH V diagL Parameter High Voltage Clamp Saturation Voltage of The Power Stage Control Circuit Supply Current Control Circuit Supply Voltage Driver Stage Stand-by Current Driver Stage Supply Voltage Diagnostic Current at -40 o C T j 125 o C Wich The Flag Switches High Level Input Voltage Low Level Input Voltage High Level Input Current V in = 5.5 V Positive Threshold Negative Threshold Hysteresis Voltage Turn-Off Current Switch-Off Time High Level Diagnostic Output Voltage Low Level Diagnostic Output Volatge V in = 4 V -40 o C T j 125 o C Ic = 6 A (see note 1) Rflag = 20 K Rflag = 100 K V in = 4 V 5.5 2.75 4 0 20 2.8 1.3 1.3 7.3 10 4 Ic = 6A; Test Conditions V in = 0.4 V -40 C Tj 125 C o o Min. 320 Typ. Max. 510 2 15 Unit V V mA V mA V mA V V A V V V A s V V Id = 80 mA; Vin = 4V 4.5 5.5 180 16 3.35 5.5 0.2 600 3.2 1.7 1.7 8.8 80 4.5 0.1 Note 1: Time fron input swi tching Vne g unti l VCL drops to 200 V PRINCIPLE OF OPERATION The VB024 is designed to drive the primary side of an ignition coil and provide a logic signal output to indicate a predetermined coil current level. This output signal is used to perform dwell control. This part is intended for use in Engine Control Modules. It could also be used in an ignition module or integrated into an ignition coil assembly. The VB024 accepts an input High signal from the control IC to start charging the primary side of the ignition coil. When the primary coil current reaches 3 amps, the VB024 outputs a logic High signal to the control IC. This flag signal is used in the calculation of the dwell time. This device also has a maximum primary coil current Ic(max) Shut-off feature. Ic(max) equals aproximately 1.5 times the nominal primary coil currnet. If the Ic reaches Ic(max), the output stage will Shut-off causing the spark to occour. The VB024 is also internally clamped to protect it from the flyback voltage of the primary inductance as the output stage is turned off. OVERVOLTAGE The VB024 withstand the following transient test performed using a "Schaffner" equipment at TA = o 80 C: 1) LOAD DUMP Ten pulses with 10 second intervals between each transient. The device withstand load dump while fully on, fully off and during the transition between states (see figures 3 and 4). 2) NEGATIVE TRANSIENTS Ten negative transients with 10 second intervals between each transient (see figure 5). 3) REVERSE BATTERY Inversion of battery voltage for a time = 60 sec (see figure 5). 3/8 VB024 FIGURE1: Application Circut FIGURE2: Switching Waveforms 4/8 VB024 FIGURE 3: Load Dump Test Circut FIGURE 4: Load Dump Input Waveform 5/8 VB024 FIGURE 5: Negative Transients Test Circut FIGURE 6: Reverse Battery Test Circuit (*) This resi stor represents vehicle wiring harness resistance 6/8 VB024 ISOWATT7 MECHANICAL DATA DIM. A B C D D1 E F F1 F2 G G1 G2 H L1 L2 L3 L4 L5 L6 L7 L8 L9 L10 L11 M N mm TYP. inch TYP. MIN. 5.35 3.4 0.8 2.95 1.95 0.5 0.7 MAX. 5.65 3.7 1.28 3.1 2.15 0.6 0.8 MIN. 0.210 0.133 0.031 0.116 0.076 0.019 0.027 MAX. 0.222 0.145 0.050 0.122 0.084 0.023 0.031 1.1 1.4 4.88 7.42 9.96 15.9 19.85 19.35 8.9 28 4.9 15.9 2.1 23 24.8 19.8 17.7 7.83 2.75 3.5 5.28 7.82 10.36 16.1 20.15 19.65 9.1 29 5.1 16.1 2.3 23.4 25.2 20.2 18.3 8.33 3.25 3.7 0.192 0.292 0.392 0.626 0.781 0.761 0.350 1.102 0.193 0.626 0.082 0.905 0.976 0.779 0.697 0.308 0.108 0.138 0.043 0.055 0.207 0.308 0.408 0.634 0.793 0.773 0.358 1.141 0.201 0.634 0.090 0.921 0.992 0.795 0.720 0.328 0.128 0.145 L9 L10 L11 E A B D1 C L3 L2 L1 F2 F1 D O = G1 = = G2 = = =G = H Dia. F L5 L6 L8 L4 L7 = = = N M P033B 7/8 VB024 Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability 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 SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use ascritical components in life support devices or systems without express written approval of SGS-THOMSON Microelectonics. (c) 1994 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A 8/8 |
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