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What is UC3730?

This electronic component, produced by the manufacturer "Unitrode", performs the same function as "Thermal Monitor".


UC3730 Datasheet PDF - Unitrode

Part Number UC3730
Description Thermal Monitor
Manufacturers Unitrode 
Logo Unitrode Logo 


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Thermal Monitor
UC1730
UC2730
UC3730
FEATURES
On-Chip Temperature Transducer
Temperature Comparator Gives
Threshold Temperature Alarm
Power Reference Permits Airflow
Diagnostics
Precision 2.5V Power Reference
Permits Airflow Diagnostics
Transducer Output is Easily Scaled
for Increased Sensitivity
Low 2.5mA Quiescent Current
BLOCK DIAGRAM
DESCRIPTION
The UC1730 family of integrated circuit devices are designed to be used in
a number of thermal monitoring applications. Each IC combines a tempera-
ture transducer, precision reference, and temperature comparator allowing
the device to respond with a logic output if temperatures exceed a user pro-
grammed level. The reference on these devices is capable of supplying in
excess of 250mA of output current by setting a level of power dissipation
the rise in die temperature will vary with airflow past the package, allowing
the IC to respond to airflow conditions
These devices come in an 8-Pin DIP, plastic or ceramic, a 5-Pin TO-220 or a
PLCC-20 version. In the 8-Pin version, a PTAT (proportional to absolute
temperature) output reports die temperature directly. This output is config-
ured such that its output level can be easily scaled up with two external gain
resistors. A second PTAT source is internally referenced to the temperature
comparator. The other input to this comparator can then be externally pro-
grammed to set a temperature threshold. When this temperature threshold
is exceeded an alarm delay output is activated. Following the activation of
the delay output, a separate open collector output is turned on. The delay
pin can be programmed with an external RC to provide a time separation
between activation of the delay pin and the alarm pin, permitting shutdown
diagnostics in applications where the open collector outputs of multiple parts
are wire OR’ed together.
The 5-Pin version in the TO-220 package is well suited for monitoring
heatsink temperatures. Enhanced airflow sensitivities can be obtained with
this package by mounting the device to a small heatsink in the airstream.
This version of the device does not include the PTAT output or the open col-
lector alarm output.
10/94
Pin numbers shown for 8-Pin DIP, ( ) number for 5-Pin TO-220.

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UC3730 equivalent
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO
BE FULLY AT THE CUSTOMER’S RISK.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright © 1999, Texas Instruments Incorporated


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Featured Datasheets

Part NumberDescriptionMFRS
UC3730The function is Thermal Monitor. UnitrodeUnitrode
UC3730The function is Thermal Monitor. Texas InstrumentsTexas Instruments

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