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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LR8 датащи(PDF) 1 Page - Microchip Technology |
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LR8 датащи(HTML) 1 Page - Microchip Technology |
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1 / 16 page  2015 Microchip Technology Inc. DS20005399A-page 1 LR8 Features • 13.2 - 450V input voltage range • Adjustable 1.20 - 438V 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 Description LR8 is a high-voltage, low-output current, adjustable linear regulator. This regulator has a wide operating input voltage range of 13.2 - 450V. The output voltage can be adjusted from 1.20 - 438V, provided that the input voltage is at least 12V 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. 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 cur- rent, of typically 10µA, is connected to the ADJ pin. This increases VOUT by a constant voltage of 10µA times R2. LR8 provides both current and temperature limiting. The output current limit is typically 20mA and the mini- mum temperature limit is 125°C. An output short-circuit current will therefore be limited to 20mA. When the junction temperature reaches its temperature limit, the output current and/or output voltage will decrease to prevent the junction temperature from exceeding its temperature limit. For SMPS start-up circuit applica- tions, 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. LR8 is available in TO-243AA (SOT-89), TO-252 (D- PAK), and TO-92 packages. High-Input Voltage, Adjustable, 3-Terminal, Linear Regulator |
Аналогичный номер детали - LR8 |
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Аналогичное описание - LR8 |
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