L6219_08 datasheet(6/16 Pages) STMICROELECTRONICS

6 / 16 page

Block diagram

L6219

6/16

Figure 2.

SO24/PDIP24 pins connection (top view)

Table 3.

Pin functions

Pin #

Name

Description

1, 2

Output A

See pins 5, 21

3, 23

Sense resistor

Connection to lower emitters of output stage for insertion of

current sense resistor

4, 22

Comparator input

Input connected to the comparators. The voltage across the

sense resistor is feedback to this input throught the low pass

filter RC CC. The higher power transistors are disabled

when the sense voltage exceeds the reference voltage of

the selected comparator. When this occurs the current

decays for a time set by RT CT (toff = 1.1 RT CT). See

Figure 3.

5, 21

Output B

Output Connection. The output stage is a "H" bridge formed

by four transistors and four diodes suitable for switching

applications

6, 19

Ground

See pins 7, 18

7, 18

Ground

Ground connection. With pins 6 and 19 also conducts heat

from die to printed circuit copper

8, 20

Input 0

See Input 1 (pins 9, 17)

9, 17

Input 1

These pins and pins 8, 20 (input 0) are logic inputs which

select the outputs of the comparators to set the current

level. Current also depends on the sensing resistor and

reference voltage. See functional description

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