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VB027ASP
HIGH VOLTAGE IGNITION COIL DRIVER POWER IC
TYPE VB027ASP
s s s s
V clamp 345 V
I cl 9.5 A
Il im 160 mA
s
PRIMARY COIL VOLTAGE INTERNALLY SET COIL CURRENT LIMIT INTERNALLY SET LOGIC LEVEL COMPATIBLE INPUT DRIVING CURRENT QUASI PROPORTIONAL TO COLLECTOR CURRENT DOUBLE FLAG-ON COIL CURRENT
10
DESCRIPTION The VB027ASP is a high voltage power integrated circuits made using STMicroelectronics Vertical Intelligent Power Technology, with vertical current flow power darlington and logic level compatible driving circuits. Built-in protection circuits for coil current limiting and collector voltage clamping allows the VB027ASP to be used as a smart, high voltage, high current interface in advanced electronic ignition systems.
1
Power SO-10 TM
BLOCK DIAGRAM
* Pins 1-5 = Power GND, Pin 6 signal GND. Pin 6 must be connected to pins 1-5 externally.
June 1999
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VB027ASP
ABSOLUTE MAXIMUM RATING
Symb ol HV C IC Vd Id Vi n Tj T s tg Collector Voltage Collector Current Driving Stage Supply Voltage Driving Circuitry Supply Current Maximum Input Voltage Operating Junction Temperature Storage Temperature Range Parameter Value Internally Limited Internally Limited 7 200 10 -40 to 150 -55 to 150 Unit V A V mA V
o o
C C
THERMAL DATA
R t hj-ca se R t hj- amb Thermal Resistance Junct ion Case(MAX) Thermal Resistance Junct ion Ambient(MAX) 1.12 62.5
o o
C/W C/W
CONNECTION DIAGRAM
PIN FUNCTION
No 1-5 6 (*) 7 T AB 9 10 NAME GND GND Vd HV C INPUT DIAGNOST IC Output of a Logic Signal W hen Ic Is Greater T han 3 A Emitter Power G round Control G round Supply Voltage F or T he Power Stage Output to The Primary Coil F UNCTION
(*) PIN 6 must be connected to PINS 1 - 5 externally
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VB027ASP
ELECTRICAL CHARACTERISTICS (Vb = 13.5 V; Vd = 5 V; Tj = 25 oC; Rcoil = 510 m; Lcoil = 7 mH; unless otherwise specified)
Symb ol V cl V cl V ce( sa t ) V ce( sa t ) I d(std by) I d(ugnd ) Parameter High Voltage Clamp High Voltage Clamp Saturation Voltage of The Power Stage Saturation Voltage of The Power Stage Stand-by Supply Current Stand-by Supply Current During Underground Power On Supply Current Power On Supply Current Driver Stage Supply Voltage Coil Current Limit Coil Current Limit Drift With Temperature Collector Leakage Current High Level Input Voltage Low Level Input Voltage High Level Input Current High Level Diagnostic Output Voltage Low Level Diagnostic Output Voltage Diagnostic Current First Threshold Diagnostic Current First Threshold Drift With Temperature Diagnostic Current Second Threshold Diagnostic Current Second Threshold Drift With Temperature Overtemperature Diagnostic Current Delay Time Coil Current Fall Time Coil Current Inductive Energy Temperature of Diagnostic Shift Thermal Hysteresis Forward Voltage of The Body Diode I c = -10 A 1.2 R EXT = 15 K (see fig. 1) R EXT = 15 K (see fig. 1) C EXT = 1nF C EXT = 1nF 4.25 See figure 4 4.5 3.5 V in = 4 V See figure 3 V C = 125V 4 0 100 5.5 0.8 200 Vd 0.5 4.75 A V V A V V A
o
T est Co nditi ons -40 C T j 125 C I coil = 7 A I c = 7A; Vin = 4V o o -40 C T j 125 C I c = 6 A; Vin = 4V o o -40 C T j 125 C V in = 0.4 V in = 0.4 V I c = -4.5A o o -40 C T j 125 C V in = 4 V o -40 C T j V in = 4 V o -40 C T j Ic = 6 A o 125 C Ic = 7 A o 125 C
o
Min . 300 325
Typ . 345
Max. 400 365 3 2 11 160
Unit V V V V mA mA
I coil = 7 A
I d(on) I d(on) Vd Ic l I cl( td) I le ak V in H V in L I in H V dia gH V di agL I di agTH1 I di agTD1
130 160 4.5 8.5 5.5 10
mA mA V A
I di agTH2 I di agTD2
5.45 See figure 5
5.8
6.15
A
I di agH t dl c t flc E s/ b T in t T h ys VF
2 Ic = 7 A Ic = 7 A V CL = 400 V Ic = 7A L = 8mH 5 2 300 130
2.6 25 8 150 30 2.2
3.2 45 15 170
A s s mJ
o
C C
o
3.2
V
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VB027ASP
PRINCIPLE OF OPERATION The VB027ASP 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 VB027ASP 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 VB027ASP 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 345V. 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. THERMAL BEHAVIOUR You can see in the block diagram of the VB027ASP a box called overtemperature protection. The purpose of this circuit is to shift the current level at witch the 1st diagnostic is activated down of about 2.5A. This information can be managed by the micro that can take the corrective actions in order to reduce the power dissipation. This block is not an effective protection but just an overtemperature detection. The shift down of the 1st flag level cannot be present for temperatures lower than 125 oC. As an example of its behaviour 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 1st flag threshold. EXAMPLE: Iflag info after X msec. (Iflag = 4.5A) Iswitch off after K*X msec. As soon as the temperature rises over the overtemp. threshold, the 1st diagnostic is shifted down to about 2.5A and in this example, the switch off current will be K*X*2.5/4.5 helping the system to reduce the power dissipation. As you can see this behaviour is not a protection but just a feedback for the micro. FEEDBACK When the collector current exceeds 4.5A, the feedback signal is turned high and it remains so, until the load current reaches 5.8A (second threshold), at that value, the feedback signal is turned low. OVERVOLTAGE The VB027BSP can withstand the following transients of the battery line: -100V/2msec (Ri = 10 ) +100V/0.2msec (Ri = 10 ) +50V/400msec (Ri = 4.2 , with VIN = 3 V)
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VB027ASP
FIGURE 1: Application Circuit
FIGURE 2: Switching Waveforms
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VB027ASP
FIGURE 3: Maximum Icl Versus Temperature FIGURE 4: Iflag1 Versus Temperature
FIGURE 5: Iflag2 Versus Temperature
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VB027ASP
PowerSO-10 MECHANICAL DATA
DIM. A A1 B C D D1 e E E1 E2 E3 E4 F h H L q 0o 13.80 1.20 1.70 8o 9.30 7.20 7.20 6.10 5.90 1.25 0.50 14.40 1.80 0.543 0.047 0.067 mm MIN. 3.35 0.00 0.40 0.35 9.40 7.40 1.27 9.50 7.40 7.60 6.35 6.10 1.35 0.366 0.283 0.283 0.240 0.232 0.049 0.002 0.567 0.071 TYP. MAX. 3.65 0.10 0.60 0.55 9.60 7.60 MIN. 0.132 0.000 0.016 0.013 0.370 0.291 0.050 0.374 0.291 0.300 0.250 0.240 0.053 inch TYP. MAX. 0.144 0.004 0.024 0.022 0.378 0.300
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
h
D = D1 = = = SEATING PLANE
= A1 L
DETAIL "A"
0068039-C
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VB027ASP
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. Specification 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 trademark of STMicroelectronics (c) 1999 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. http://www.st.com .
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