2-23

TELCOM SEMICONDUCTOR, INC.

7

6

5

4

3

1

2

8

Hysteresis

To prevent output "chattering" at the trip point tempera-

ture, the temperature detector in the TC622/624 has 2

°C of

hysteresis (See Figure 1).

The outputs are driven active when the temperature

crosses the setpoint determined by the external resistor. As

temperature declines below the setpoint, the hysteresis

action will hold the outputs true until the temperature drops

2

°C below the threshold.

SET POINT

TEMPERATURE

OUT

(SET POINT - 2 DEGREE C)

OUT

Figure 1. TC622/624 Hysteresis

PIN CONFIGURATIONS

8-Pin DIP

8-Pin SOIC

GND

NC

OUT

OUT

NC

NC

GND

NC

T

SET

T

SET

NC

OUT

OUT

NC

GND

NC

OUT

OUT

NC

NC

T

SET

GND

NC

OUT

OUT

NC

NC

T

SET

12 3 4 5

TC622EAT

TC622VAT

8

7

6

5

1

2

3

4

1

8

2

7

3

6

4

5

8

7

6

5

1

2

3

4

1

8

2

7

3

6

4

5

TC622CPA

TC622EPA

TC622VPA

TC624CPA

TC624EPA

TC624VPA

TC622COA

TC622EOA

TC622VOA

TC624COA

TC624EOA

TC624VOA

8-Pin DIP

8-Pin SOIC

5-Pin TO-220

NOTE: For TO-220 Package, Pin 3 is

connected to case heatsink.

LOW COST, SINGLE TRIP POINT

TEMPERATURE SENSOR

TC622

TC624