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TelCom Semiconductor

TC626 Datasheet Preview

TC626 Datasheet

TEMPERATURE LIMIT SWITCH

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1
TEMPERATURE LIMIT SWITCH
FEATURES
s Requires No External Components
s On-Chip Temperature Sensing
s TO-220 package for "Hot Spot" Mounting
s 50mA Output Signal TO-220 Package (TC626VAB)
s TO-92 Package for Direct Circuit Board Mounting
APPLICATIONS
s Vibration-Immune Temperature Sensing
s Fan Speed Control Circuits
s System Overtemperature Shutdown
s Advanced Thermal Warning
s Consumer Products
SYSTEM OVERTEMPERATURE PROTECTION
5V TO 18V
2
PIN 1 SWITCHES 'HIGH' IF
TEMPERATURE GOES ABOVE
THE PRESET VALUE.
NC
1
TC626
3
SYSTEM POWER
RELAY
NC = NORMALLY CLOSED
PIN CONFIGURATIONS
TO-220-3
TO-92-3
1 23
TC626*
* PATENTED
GENERAL DESCRIPTION
The TC626 is a temperature limit detector that notifies
the system when measured temperature is above the fac-
tory-programmed setting. It is designed to replace mechani-
cal (bimetal) temperature limit switches and offers increased
ruggedness, higher reliability and greater setpoint accuracy.
It requires no external components.
The TC626 operates over a – 55°C to +125°C tempera-
ture range. It is available in a TO-92 package, which is ideal
for ambient temperature sensing applications. It is also
available in a TO-220-3 package for heatsink temperature
measurement applications.
2
3
ORDERING INFORMATION
Part Number*
Temperature
Package
Range
TC626040VAB
TO-220-3
– 55°C to +125°C
TC626040VZB
TO-92-3
– 55°C to +125°C
TC626050VAB
TO-220-3
– 55°C to +125°C
TC626050VZB
TO-92-3
– 55°C to +125°C
TC626080VAB
TO-220-3
– 55°C to +125°C
TC626080VZB
TO-92-3
– 55°C to +125°C
TC626090VAB
TO-220-3
– 55°C to +125°C
TC626090VZB
TO-92-3
– 55°C to +125°C
TC626100VAB
TO-220-3
– 55°C to +125°C
TC626100VZB
TO-92-3
– 55°C to +125°C
*Trip-point temperature is designated as follows: Part numbers are
TC626xxxVAB or TC626VZB, where xxx = trip-point tempeature in °C.
For high volume applications requiring different trip-points, contact
factory.
4
5
6
TC626xxxVAB
123
123
TC626xxxVZB
TELCOM SEMICONDUCTOR, INC.
7
8
TC626-6 8/23/96
2-29




TelCom Semiconductor

TC626 Datasheet Preview

TC626 Datasheet

TEMPERATURE LIMIT SWITCH

No Preview Available !

PRELIMINARY INFORMATION
TEMPERATURE LIMIT SWITCH
TC626
ABSOLUTE MAXIMUM RATINGS*
Package Power Dissipation (TA 70°C)
TO-92 ...........................................................440mW
TO-220 ............................................................1.6mW
Supply Voltage ............................................................20V
Input Voltage Any Input ...... (GND – 0.3V) to (VDD + 0.3V)
Operating Temperature ......................... – 55°C to +125°C
Maximum Junction Temperature ........................... +150°C
Storage Temperature ............................ – 65°C to +150°C
Lead Temperature (Soldering, 10 sec) ................. +300°C
*Stresses above those listed under "Absolute Maximum Ratings" may
cause permanent damage to the device. These are stress ratings only and
functional operation of the device at these or any other conditions above
those indicated in the operation sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
ELECTRICAL CHARACTERISTICS: VDD = +5V and TA = – 55°C to +125°C, unless otherwise specified.
Parameter
Test Conditions
Min Typ Max Units
Supply Voltage
Supply Current
Output Resistance
Output Current
Absolute Accuracy
Trip Point Hysteresis
Output High or Low
Source/Sink, VCC = 18V
Source/Sink, VCC = 4.5V
At trip point
4.5
T–3
3.5
— 18
300 600
— 75
— 25
— 10
T T+3
5 6.5
V
µA
mA
mA
°C
°C
TelCom Semiconductor reserves the right to make changes in the circuitry or specifications detailed in this manual at any time without notice. Minimums
and maximums are guaranteed. All other specifications are intended as guidelines only. TelCom Semiconductor assumes no responsibility for the use of
any circuits described herein and makes no representations that they are free from patent infringement.
DETAILED DESCRIPTION
The TC626 output maintains a logic low state when
measured temperature is below the factory-programmed
setting. As temperature rises, the output is driven active to
a high level [VDD – (IOUT)(ROUT)] when temperature equals
the setpoint value ±3°C.
Built-in hysteresis prevents output "chattering" when
measured temperature is at (or near) the trip point (Figure 1).
As temperature falls through the trip point, hysteresis main-
tains the output high until measured temperature is 5°C
lower than the trip point setting.
The TC626VZB (TO-92 package) has a maximum out-
put current of 10mA while the TC626VAB has a maximum
output current of 50mA. Care must be taken to observe
these output current limits as output currents in excess of
those stated will cause device self-heating resulting in
erroneous temperature measurements.
SET POINT
(SET POINT – 5°C)
OUTPUT
Figure 1. TC626 Operation
2-30 TELCOM SEMICONDUCTOR, INC.


Part Number TC626
Description TEMPERATURE LIMIT SWITCH
Maker TelCom Semiconductor
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TC626 Datasheet PDF






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