PIN FUNCTIONS

N

°

Name

Fun ction

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

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 Funcional Description.

10;16

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.

11;15

REFERENCE VOLTAGE

A voltage applied to this pin sets the reference voltage of the comparators,

inputs INPUT 0 and INPUT 1).

12;14

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

13

Supply Voltage Input for Logic Circuitry

24

Supply Voltage Input for the Output Stages.

PIN CONNECTION (Top view)

UDN2916A

2/8