june 1999 1/9 ? vb027 / vb027(011y) / vb027(012y) high voltage ignition coil driver power i.c. n primary coil voltage internally set n coil current limit internally set n logic level compatible input n driving current quasi proportional to collector current n double flag-on coil current description the vb027, vb027(011y), vb027(012y) is a high voltage power integrated circuit made using the stmicroelectronics vipower ? 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 voltage, high current interface in advanced electronic ignition system. type v cl(min) i cl(max) i d(on)max vb027 vb027(011y) vb027(012y) 300v 9a 130ma block diagram driver gnd overtemp. flag 1 reference protection r sense v d hv c flag input flag 2 quasi prop. base current pentawatt hv + - + - pentawatt hv (011y) pentawatt hv (012y) order codes: pentawatt hv pentawatt hv (011y) vb027 vb027(011y) pentawatt hv (012y) vb027(012y)
2/9 vb027 / vb027(011y) / vb027(012y) 1 absolute maximum rating thermal data connection diagram (top view) symbol parameter value unit hv c collector voltage internally limited v i c collector current internally limited a v d driving stage supply voltage 7 v i d driving circuitry supply current 200 ma v in input voltage 10 v t j junction operating temperature -40 to 150 c t stg storage temperature -55 to 150 c symbol parameter value unit r thj-case thermal resistance junction-case (max) 1.12 c/w r thj-amb thermal resistance junction-ambient (max) 62.5 c/w pin function (pentawatt hv) no name function 1 gnd emitter power ground 2v d driving stage supply voltage 3hv c primary coil output signal 4 input logic input channel 5 diag diagnostic output signal 5 4 3 2 1 hv c gnd v d input diag
3/9 vb027 / vb027(011y) / vb027(012y) electrical characteristics (v cc =13.5v; v d =5v; tj=25?c; r coil =510m w; l coil =7mh unless otherwise specified) note 1: the primary coil current value i cl must be measured 1ms after desaturation of the power stage. note 2: time from input switching v neg until collector voltage equal 200v. (*) v d -v be(on) symbol parameter test conditions min typ max unit v cl high voltage clamp -40 c t j 125 c; i c =6a 300 360 400 v v cg(sat) power stage saturation voltage i c =6a; v in =4v 1.5 v v cg(sat)td power stage saturation voltage derating in temperature i c =6a; v in =4v; -40 c t j 125 c2v i d(off) power-off supply current v in =0.4v 10 ma i d(on) power-on supply current v in =4v; i c =6a; -40 c t j 125 c 130 ma v d driving stage supply voltage 4.5 5.5 v i cl collector current limit v in =4v (see note 1) 8 8.5 9 a i cl(td) collector current limit drift with temperature see figure 3 v inh high level input voltage 4 5.5 v v inl low level input voltage 0 0.8 v i inh high level input current v in =4v 200 m a v diagh high level diagnostic output voltage r ext =22k w (see figure 1) 3.5 (*) v d v v diagl low level diagnostic output voltage r ext =22k w (see figure 1) 0.5 v i c(diag1) first threshold level collector current 4.25 4.5 4.75 a i c(diag1)td first threshold level collector current drift with temperature see figure 4 i c(diag2) second threshold level collector current 5.45 5.8 6.15 a i c(diag2)td second threshold level collector current drift with temperature see figure 5 t d(off) turn-off delay time of output current i c =6a; (see note 2) 25 m s t f(off) turn-off fall time of output current i c =6a 8 m s t d(diag) delay time of diagnostic current r ext =22k w (see figure 1) 1 m s t r(diag) turn-on rise time of diagnostic current r ext =22k w (see figure 1) 1 m s t f(diag) turn-off fall time of diagnostic current r ext =22k w (see figure 1) 1 m s 1
4/9 vb027 / vb027(011y) / vb027(012y) 1 principle of operation the vb027, vb027(011y), vb027(012y) 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 v in of the vb027, vb027(011y), vb027(012y) is fed from a low power signal generated by an external controller that determines both dwell time and ignition point. during v in high ( 4v) the vb027, vb027(011y), vb027(012y) 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 m c forces the v in to the low state. during the coil current switch-off, the primary voltage hv c is clamped by a series of zener diodes at an internally set value v cl , typically 360v. the collector current sensed through the r sense , is limited thanks to the acurrent limitero block that, as soon as the i cl level is reached, forces the darlington (using the adrivero 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 (hv c ) 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. vb027, vb027(011y), vb027(012y) 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. thermal behaviour you can see in the block diagram of the vb027, vb027(011y), vb027(012y) 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 125 c. 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: i c(diag1) info after x ms (i c(diag1) =2.5a) i switch-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 vb027, vb027(011y), vb027(012y) can withstand the following transients of the battery line: -100v / 2ms (r i =10 w ) +100v / 0.2ms (r i =10 w ) +50v / 400ms (r i =4.2 w, with v in =3v) figure 1: application circuit
5/9 vb027 / vb027(011y) / vb027(012y) 1 figure 2: switching waveform figure 3: maximum i cl vs temperature figure 5: i c(diag2) vs temperature figure 4: i c(diag1) vs temperature 1 v in 2 nd threshold 1 st threshold i cl diag
6/9 vb027 / vb027(011y) / vb027(012y) dim. mm. inch min. typ max. min. typ. max. a 4.30 4.80 0.169 0.189 c 1.17 1.37 0.046 0.054 d 2.40 2.80 0.094 0.11 e 0.35 0.55 0.014 0.022 f 0.60 0.80 0.024 0.031 g1 4.91 5.21 0.193 0.205 g2 7.49 7.80 0.295 0.307 h1 9.30 9.70 0.366 0.382 h2 10.40 0.409 h3 10.05 10.40 0.396 0.409 l 15.60 17.30 6.14 0.681 l1 14.60 15.22 0.575 0.599 l2 21.20 21.85 0.835 0.860 l3 22.20 22.82 0.874 0.898 l5 2.60 3 0.102 0.118 l6 15.10 15.80 0.594 0.622 l7 6 6.60 0.236 0.260 m 2.50 3.10 0.098 0.122 m1 4.50 5.60 0.177 0.220 r 0.50 0.02 v4 90 (typ) diam 3.65 3.85 0.144 0.152 p023h3 pentawatt hv mechanical data
7/9 vb027 / vb027(011y) / vb027(012y) p023h1 1 dim. mm. inch min. typ max. min. typ. max. a 4.30 4.80 0.169 0.189 c 1.17 1.37 0.046 0.054 d 2.40 2.80 0.094 0.11 e 0.35 0.55 0.014 0.022 f 0.60 0.80 0.024 0.031 g1 4.91 5.21 0.193 0.205 g2 7.49 7.80 0.295 0.307 h1 9.30 9.70 0.366 0.382 h2 10.40 0.409 h3 10.05 10.40 0.396 0.409 l1 3.90 4.50 0.154 0.177 l2 15.10 16.10 0.594 0.634 l3 4.80 5.40 0.189 0.213 l5 2.60 3.00 0.102 0.118 l6 15.10 15.80 0.594 0.622 l7 6.00 6.60 0.236 0.26 r 0.5 v2 30 (typ) v4 90 (typ) dia 3.65 3.85 0.144 0.152 pentawatt hv 011y (horizontal) mechanical data
8/9 vb027 / vb027(011y) / vb027(012y) 1 1 dim. mm. inch min. typ max. min. typ. max. a 4.3 4.8 0.169 0.189 a1 2.5 3.1 0.098 0.122 b 0.6 0.8 0.024 0.031 b1 0.75 0.9 0.03 0.035 c 0.35 0.55 0.014 0.022 c1 1.22 1.42 0.048 0.056 d 9 9.35 0.354 0.368 d1 15.2 15.8 0.598 0.622 e 2.44 2.64 0.096 0.104 e1 3.71 3.91 0.146 0.154 e 10 10.4 0.394 0.409 l 22.32 22.92 0.879 0.902 l1 25.1 25.7 0.988 1.012 p 3.65 3.95 0.144 0.156 s 2.55 3.05 0.1 0.12 pentawatt hv 012y (in line) mechanical data e1 e b1 d1 s e b l1 l a1 c d p c1 a p010p
9/9 vb027 / vb027(011y) / vb027(012y) 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 ? 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.
|
