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VB025MSP
HIGH VOLTAGE IGNITION COIL DRIVER POWER IC
VB025SP
HIGH VOLTAGE IGNITION COIL DRIVER
POWER IC PRIMARY COIL VOLTAGE INTERNALLY SET COIL CURRENT LIMIT INTERNALLY SET LOGIC LEVEL COMPATIBLE INPUT DRIVING CURRENT QUASI
PROPORTIONAL TO COLLECTOR
CURRENT SINGLE FLAG-ON COIL CURRENT
DESCRIPTION
The VB025SP is a high voltage power integrated
circuit made using STMicroelectronics VIPower
Technology, with vertical current flow power
darlington and logic level compatible driving circuit.
Built-in protection circuits for coil current limiting
and collector voltage clamping allows the
VB025SP to be used as a smart, high voltage,
high current interface in advanced electronic
ignition systems.
March 1999
BLOCK DIAGRAM
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ABSOLUTE MAXIMUM RATING
(∗) With 10 mils Al wire
THERMAL DATA
(�) see application note AN515/1094 on VIPower data-book 1st edition.
VB025SP
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CONNECTION DIAGRAM
PIN FUNCTION
(*) Pin 6 must be connected to pins 1-5 externally
ELECTRICAL CHARACTERISTICS (5.3V < Vb < 24V; VCC = 5 V ± 10%; -40o C < Tj < 125oC;
Rcoil = 580 mΩ; Lcoil = 3.75 mH; unless otherwise specified; see note 1)
VB025SP
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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
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FIG. 4 Single Pulse Typical Es/b CurveFig. 3 Flag Current Versus Temperature
FIG. 5 Propagation Times Definitions.
Fig. 1 Main Waveforms During On Phase Fig. 2 Output Current Waveform After Thermal
Protection Activation
VB025SP
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VB025SP
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