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LM26 데이터시트(PDF) 7 Page - Texas Instruments |
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LM26 데이터시트(HTML) 7 Page - Texas Instruments |
7 / 24 page VTEMP GND OS HYST REF TEMP SENSOR + - V+ V + LM26__C HYST VTEMP GND HYST REF TEMP SENSOR + - HYST LM26__B V + US VTEMP GND HYST OS REF TEMP SENSOR + - HYST LM26__A V + LM26 www.ti.com SNIS115S – MAY 2001 – REVISED SEPTEMBER 2015 8 Detailed Description 8.1 Overview The LM26 is a factory preset thermostat (temperature switch) that includes an integrated temperature sensor, reference voltage, DAC and comparator. The LM26 can be factory programmed to have a trip point anywhere in the range of −55°C to +120°C. The output functionality can also be changed during the manufacturing process, as described in the functional block diagrams. Available options include: • OS: active low, open drain that indicates an over temperature shutdown event (most common) • US: active low, open-drain that indicates an under temperature shutdown event • OS: active high, push-pull that indicates an over temperature shutdown event • US: active high, push-pull that indicates an under temperature shutdown event The internal temperature sensor is brought out on the VTEMP pin and can be used to determine the temperature that the LM26 is reading by monitoring with an ADC. It has a negative temperature coefficient (NTC) of approximately -10mV/°C. This pin also allows after assembly PCB testing (see section After Assembly PCB Testing for more details). The comparator hysteresis is selectable by the state of the HYST. Two values are available 10°C or 2°C. Comparator hysteresis is essential, as it prevents comparator output chattering when the temperature is at the comparator threshold set point (REF as shown in the functional block diagrams). Once the comparator trips the hysteresis function changes the comparator threshold (REF) level such that the output remains locked in the active state. The threshold is changed by either 10°C or 2°C as programmed by the state of the HYST pin. 8.2 Functional Block Diagrams Figure 2. LM26-_ _A Output Pin Block Diagram Figure 3. LM26-_ _B Output Pin Block Diagram Figure 4. LM26-_ _C Output Pin Block Diagram Copyright © 2001–2015, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: LM26 |
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