Datenblatt-Suchmaschine für elektronische Bauteile |
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LR8 Datenblatt(PDF) 1 Page - Supertex, Inc |
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LR8 Datenblatt(HTML) 1 Page - Supertex, Inc |
1 / 11 page 1 LR8 High Input Voltage Adjustable 3-Terminal Linear Regulator Features ❏ 12V to 450V input voltage range ❏ Adjustable 1.20V to 440V output regulation ❏ 5% output voltage tolerance ❏ Output current limiting ❏ 10µA typical ADJ current ❏ Internal junction temperature limiting Applications ❏ Off-line SMPS startup circuits ❏ Adjustable high voltage constant current source ❏ Industrial Controls ❏ Motor controls ❏ Battery chargers ❏ Power supplies General Description The Supertex LR8 is a high voltage, low output current, adjustable linear regulator. It has a wide operating input voltage range of 12V to 450V. The output voltage can be adjusted from 1.20V to 440V provided that the input voltage is at least 10V greater than the output voltage. The output voltage can be adjusted by means of two external resistors R1 and R2 as shown in the typical application circuits. The LR8 regulates the voltage difference between VOUT and ADJ pins to a nominal value of 1.20V. The 1.20V is amplified by the external resistor ratio R1 and R2. An internal constant bias current of typically 10µA is connected to the ADJ pin. This increases VOUT by a constant voltage of 10µA times R2. The LR8 has current limiting and temperature limiting. The output current limit is typically 15mA and the minimum temperature limit is 125°C. An output short circuit current will therefore be limited to 15mA. When the junction temperature reaches its temperature limit, the output current and/or output voltage will decrease to keep the junction temperature from exceeding its temperature limit. For SMPS start-up circuit applications, the LR8 turns off when an external voltage greater than the output voltage of the LR8 is applied to VOUT of the LR8. To maintain stability, a bypass capacitor of 1.0µF or larger and a minimum DC output current of 500µA are required. The device is available in TO-92, TO-243AA (SOT-89), and TO-252 (D-PAK) packages. LR8 12/03/01 Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website. LR8 Block Diagram and Typical Application LR8 VIN V OUT ADJ V IN * *Required for conditions where VIN is less than VOUT. R1 R2 C2 C1 RLOAD VOUT |
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Ähnliche Beschreibung - LR8 |
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