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VB025SP Datasheet(PDF) 4 Page - STMicroelectronics |
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VB025SP Datasheet(HTML) 4 Page - STMicroelectronics |
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4 / 7 page  Symbol Parameter Test Cond iti ons Min. Typ. Max. Un it VinH High Level Input Voltage VCC =4.5V 4 VCC V Vin L Low Level Input Voltage VCC =5.5V -0. 3 0. 8 V Vin(h ys ) Input Threshold Hysteresis 0.4 V Iin H High Level Input Current Vin = 4 V 100 µA IinL Low Level Input Current Vin =0. 8 V -100 µA Iin pd Input Act ive Pull-Down Vin = 4 V 10 100 µA VdiagH High Level Flag O utput Voltage REXT =22 K Ω CEXT =1 nF (see not e 3) VCC-1 VCC V VdiagL Low Level Flag O utput Voltage REXT =22 K Ω CEXT =1 nF (see not e 3) 0. 5 V Id iagTH Coil Current Level Threshold Tj =25 o C (see f igure 1) 4. 25 4.5 4.75 A Id iagTD Coil Current Level Threshold Drift (see figure 3) Idiag High Level Flag O utput Current IC >IdiagTH Vdiag =3 V 0.5 T BD mA Idia g(leak) Leakage Current O n Flag Output Vin =LO W VCC = 5.5V 10 µA VF Antiparallel Diode Forward Voltage Ic =-1 A 2 V Es/b Single Pulse Avalanche Energy L= 6mH IC =8 A (see figure 4) 180 mJ tpHL Turn-on Delay Time of Coil Current Rc =0.5 Ω Lc =3.75 mH (see figure 5) TBD µs tpLH Turn-off Delay Time of Coil Current Rc =0.5 Ω Lc =3.75 mH Ic =6.5 A (see figure 5) TBD µs Note 1: Parametric degradation are allowed with 5.3 < Vb < 10V and Vb > 24V. Note 2: The primary coil current value Icl must be measured 1ms after desaturation of the power stage. Note 3: No Internal Pull-Down (*) Internally limited ELECTRICAL CHARACTERISTICS (continued) PRINCIPLE OF OPERATION The VB025SP is mainly intended as a 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 VB025SP 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 VB025SP increases current in the coil to the desired, internally set current level. After reaching this level, the coil current remains constant until the ignition point, that corresponds to the transition of Vin from high to low (typ. 1.9V threshold). During the coil current switch-off, the primary voltage HVc is clamped at an internally set value Vcl, typically 380V. The transition from saturation to desaturation, coil current limiting phase, must have the ability to accomodate an overvoltage. A maximum overshoot of 20V is allowed. FEEDBACK When the collector current exceeds 4.5A, the feedback signal is turned high and it remains so, until the input voltage is turned-off. OVERVOLTAGE The VB025SP can withstand the following transients of the battery line: -100V/2msec (Ri =10 Ω) +100V/0.2msec (Ri =10 Ω) +50V/400msec (Ri = 4.2 Ω, with VIN =3 V) VB025SP 4/7 |
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