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LM25574 Datasheet(PDF) 15 Page - Texas Instruments |
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LM25574 Datasheet(HTML) 15 Page - Texas Instruments |
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15 / 30 page  L1 = 5V x (42V - 5V) 0.2A x 300 kHz x 42V = 73 PH L1 = VOUT x (VIN(max) ± VOUT) IRIPPLE x FS x VIN(max) IPK+ 0 mA IPK- IO IRIPPLE 1/Fs RT = [(1 / 300 x 10 3) ± 580 x 10-9] 135 x 10 -12 LM25574 www.ti.com SNVS483F – JANUARY 2007 – REVISED FEBRUARY 2009 (5) The nearest standard value of 21k Ω was chosen for RT. L1 The inductor value is determined based on the operating frequency, load current, ripple current, and the minimum and maximum input voltage (VIN(min), VIN(max)). Figure 8. Inductor Current Waveform To keep the circuit in continuous conduction mode (CCM), the maximum ripple current IRIPPLE should be less than twice the minimum load current, or 0.2Ap-p. Using this value of ripple current, the value of inductor (L1) is calculated using the following: (6) (7) Copyright © 2007–2009, Texas Instruments Incorporated Submit Documentation Feedback 15 Product Folder Links: LM25574 |
Similar Part No. - LM25574_14 |
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Similar Description - LM25574_14 |
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