L6219DSA
PIN CONNECTION (Top view)
PIN FUNCTIONS
N°
1;2
3;23
4;22
See pins 5;21
Connection to Lower Emitters of Output Stage for Insertion of Current Sense Resistor
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 R
T
C
T
(t
off
= 1.1 R
T
C
T
). See fig. 1.
OUTPUT B
Output Connection. The output stage is a ”H” bridge formed by four transistors and
four diodes suitable for switching applications.
GROUND
See pins 7;18
GROUND
Ground Connection. With pins 6 and 19 also conducts heat from die to printed circuit
copper.
INPUT 0
See INPUT 1 (pins 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 Funcional Description.
PHASE
This TTL-compatible logic inputs sets the direction of current flow through the load. A
high level causes current to flow from OUTPUT A (source) to OUTPUT B (sink). A
schmitt trigger on this input provides good noise immunity and a delay circuit prevents
output stage short circuits during switching.
REFERENCE
A voltage applied to this pin sets the reference voltage of the comparators, this
VOLTAGE
determining the output current (also thus depending on R
s
and the two inputs INPUT
0 and INPUT 1).
RC
A parallel RC network connected to this pin sets the OFF time of the higher power
transistors. The pulse generator is a monostable triggered by the output of the
comparators (t
off
= 1.1 R
T
C
T
).
V
ss
- LOGIC SUPPLY Supply Voltage Input for Logic Circuitry
Vs - LOAD SUPPLY Supply Voltage Input for the Output Stages.
Name
OUTPUT A
SENSE RESISTOR
COMPARATOR
INPUT
Function
5;21
6;19
7;18
8;20
9;17
10;16
11;15
12;14
13
24
Note:
ESD on GND, V
S
, V
SS
, OUT 1A and OUT 2A is guaranteed up to 1.5KV (Human Body Model, 1500Ω, 100pF).
2/8
STMICROELECTRONICS [ STMICROELECTRONICS ]
