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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LP8340 датащи(PDF) 11 Page - Texas Instruments |
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LP8340 датащи(HTML) 11 Page - Texas Instruments |
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11 / 18 page  R1 = R2 VO 1.25V - 1 VO = VREF R1 R2 + 1 LP8340 www.ti.com SNVS221D – FEBRUARY 2003 – REVISED APRIL 2013 OUTPUT VOLTAGE SETTING (ADJ VERSION ONLY) The output voltage is set according to the amount of negative feedback (Note that the pass transistor inverts the feedback signal). This feedback is determined by R1 and R2 with the resulting output voltage represented by the following equation: (1) Use the following equation to determine the values of R1 and R2 for a desired VOUT (R2 = 100kΩ is recommended). (2) MINIMUM LOAD CURRENT A minimum load of 100 μA is required for regulation and stability over the entire operating temperature range. If actual load current fall below 100 μA it is recommended that a resistor of value RL = VO/100μA be placed between VO and ground. START UP CONSIDERATIONS Under certain operating conditions, overshoot of VOUT at start-up can occur. The observed overshoot is a function of rise time of VIN waveform, COUT, start-up load current, and VIN−VOUT differential. The relationship between these conditions is shown in the Typical Performance Characteristics curves (Minimum Input Voltage Rise Time). VIN rise times above the curve result in <5% overshoot. Customers are encouraged to check the suitability of LP8340 in their specific application. Copyright © 2003–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LP8340 |
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