L497B データシートの表示（PDF） - STMicroelectronics

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L497B

HALL EFFECT PICKUP IGNITION CONTROLLER

STMicroelectronics 

L497

PIN FUNCTIONS (continued)

N°

Name

Function

14

DRIVER EMITTER Current Driver for the External Darlington. To ensure stability and precision

OUTPUT

of Tdesat Cc and R9 must be used. Recommended value for R9 is 2 KΩ in

order not to change the open loop gain of the system.

Rc may be added to Cc to obtain greater flexibility in various application

situations.

Cc and Rc values ranges are 1 to 100 nF and 5 to 30 KΩ depending on the

external darlington type.

15

OVERVOLTAGE LIMIT The darlington is protected against overvoltage by means of an internal

zener available at this pin and connected to pin 14. The internal divider

R3/R2 defines the limitation value given by :

Vovp

=

22.5





R3

+

5.10−3







R2

+

22.5

16

DRIVER COLLECTOR The collector current of the internal driver which drives the external

INPUT

darlington is supplied through this pin. Then the external resistor R6 limits

the maximum current supplied to the base of the external darlington.

ELECTRICAL CHARACTERISTICS (VS = 14.4 V, – 40 °C < Tj < 125 °C unless otherwise specified)

Symbol

Parameter

Test Conditions

Min. Typ. Max. Unit

V3

Min Op. Voltage

3.5

V

I3

Supply Current

V3 = 6 V

V3 = 4 V

5

18

25

mA

7

13

mA

VS

Voltage Supply

28

V

VZ3

Supply Clamping Zener Voltage IZ3 = 70 mA

V5

Input Voltage

Low Status

High Status

6.8

7.5

8.2

V

0.6

V

2.5

V

I5

Input Current

V5 = LOW

– 400

– 50 µA

V16–14

VSENS

Darlington Driver Sat. Current

Current Limit. Sensing Voltage

I14 = 50 mA

I14 = 180 mA

VS = 6 to 16 V

0.5

V

0.9

V

260 320 370 mV

I1 1C

CW Charge Current

VS = 5.3 to 16V

V11 = 0.5V

T = 10 to 33ms

– 11.0 – 9.3 – 7.8 µA

I1 1D

CW Charge Current

VS = 5.3 to 16V

V11 = 0.5V

T = 10 to 33ms

0.5

0.7

1.0

µA

I11C / I11D

VS = 5.3 to 16V

7.8

22.0

V11 = 0.5V

T = 10 to 33ms

See Note 1

ISRC

ISENSE

Percentage of Output Current

Determining the Slow Recovery

Control Start (fig. 2), note 1

90

94 98.5

%

TSRC

Duration of Altered Small Contr. CSRC = 1 µF

Ratio after SRC Function Start R7 = 62 KΩ

(fig. 2)

0.8

s

VZ15

External Darlington over V Prot. I15 = 5 mA

Zener Voltage

I15 = 2 mA

19 22.5 26

V

18 21.5 25

V

TP

Permanent Conduction Time V5 = High

CP = 1µF

R7 = 62KΩ

0.4

1.1

1.8

s

4/11

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