PIN FUNCTIONS (continued)

N

°

Name

Function

14

DRIVER COLLECTOR

INPUT

The collector current for the internal driver which drives the external

darlington is supplied through this pin. The external resistor R10 limits the

dissipation in the IC. The value this resistor depends on the darlington used

and on the limiting current in the coil.

15

OVERVOLTAGE

LIMITATION

The external darlington is protected against overvoltage by means of an

internal zener available at this pin. The external divider R5/R6 defines the

limitation value, typically given by :

= 



30

R5



16

DRIVING STAGE

OUTPUT

Current Driver for the External Darlington. To ensure stability on the current

limitation loop a capacitor C3 (typically 2.2nF, this value depending on the

darlington used) must be connected between this pin and the current

sensing input (pin 1).

°C unless otherwise specified ; referred

to the test circuit)

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Operating Supply Voltage

6

28

V

Input Stage Voltage (pin 2 with

10K

Ω resistor)

160

200

240

mV

On Pick-up Thresh. Voltage at LOW RPM

(pin 2)

mV

Current Limitation Sensing Voltage (pin 1)

200

320

mV

Zero Crossing Thresh. Voltage (pin 8)

3

20

60

mV

Hysteresis Voltage (pin 8)

100

200

mV

at LOW RPM

or pin 6 not connected

(*) Note 1

0.7

7

7

3

30

15

µA

µA

at HIGH RPM

(**) Note 2

8

13

0.7

33

44

3.2

µA

µA

Threshold Voltage

Output Current

°C

(***) Note 3

0.85

4

3

V

µA

Continuous Coil Current Protection Inhibit

LOW Voltage (pin 4).

0

0.7

V

Series Darlington Driver

0.4

1

0.6

V

V

Zener Volt. Pin 11

6.5

8.8

V

External Darlington Overvoltage Protection

Zener Voltage

°C ;

25

35

V

Pin 9 Output Current in Low Status

3

mA

Tachometer Signal Output LOW Voltage.

(pin5)

Output Leakage (pin 5)

ON Condition

OFF Condition

0.7

10

V

µA

L484

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