PIN FUNCTIONS

Name

Fu nctio n

OUT B

Output Connection (with pin OUTA). The output stage is a ”H” bridge formed by four

transistors and four diodes suitable for switching applications.

PULSE TIME

A parallel RC network connected to this pin sets the OFF time of the lower power

transistors. The pulse generator is a monostable triggered by the rising edge of the

Supply Voltage Input for Half Output Stage

GND

Ground Connection. In SO-20L and Powerdip these pins also conduct heat from die

to printed circuit copper.

Supply Voltage Input for Logic Circuitry

IN1

This pin and pin IN0 are logic inputs which select the outputs of three comparators to

set the current level. Current also depends on the sensing resistor and reference

voltage. See truth table.

PHASE

This TTL-compatible logic input sets the direction of current flow through the load. A

high level causes current to flow from OUT A (source) to OUT B (sink). A Schmitt

trigger on this input provides good noise immunity and a delay circuit prevents output

stage short circuits during switching.

IN0

See INPUT 1

COMPARATOR INPUT

Input connected to the three comparators. The voltage across the sense resistor is

are disabled when the sense voltage exceeds the reference voltage of the selected

REFERENCE

A voltage applied to this pin sets the reference voltage of the three comparators.

the output current.

Supply voltage input for half output stage

OUT A

See pin OUT B

SENSE RESISTOR

Connection to lower emitters of output stage for insertion of current sense resistor

ALARM

°C the alarm output becomes low (TEA3718SP)

PRE-ALARM

°C the prealarm output becomes low (T2<T1) (TEA3718SFP)

TEA3718-TEA3718S

3/16