VB025SP datasheet(4/7 Pages) STMICROELECTRONICS

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Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VinH

High Level Input Voltage

VCC = 4.5V

VCC

VinL

Low Level Input Voltage

VCC = 5.5V

-0.3

0.8

Vin(hys)

Input Threshold

Hysteresis

0.4

IinH

High Level Input Current

Vin = 4 V

100

µA

IinL

Low Level Input Current

Vin = 0.8 V

-100

µA

Iinpd

Input Active Pull-Down

Vin = 4 V

100

µA

VdiagH

High Level Flag Output

Voltage

REXT = 22 K

Ω

CEXT = 1 nF

(see note 3)

VCC-1

VCC

VdiagL

Low Level Flag Output

Voltage

REXT = 22 K

Ω

CEXT = 1 nF

(see note 3)

0.5

IdiagTH

Coil Current Level

Threshold

Tj = 25

o C

(see figure 1)

4.25

4.5

4.75

IdiagTD

Coil Current Level

Threshold Drift

(see figure 3)

Idiag

High Level Flag Output

Current

IC > IdiagTH

Vdiag = 3 V

0.5

TBD

Idiag(leak)

Leakage Current On Flag

Output

Vin = LOW

VCC = 5.5V

µA

Antiparallel Diode

Forward Voltage

Ic = -1 A

Es/b

Single Pulse Avalanche

Energy

L = 6 mH

IC = 8 A

(see figure 4)

180

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

overvoltage.

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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