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LM25011Q датащи(PDF) 9 Page - Texas Instruments |
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LM25011Q датащи(HTML) 9 Page - Texas Instruments |
9 / 26 page UVLO VIN SW Pin Inductor Current SS Pin t1 PGD VOUT LM25011, LM25011-Q1 www.ti.com SNVS617F – MAY 2009 – REVISED JANUARY 2011 Figure 3. Startup Sequence FUNCTIONAL DESCRIPTION The LM25011 Constant On-time Step-down Switching Regulator features all the functions needed to implement a low cost, efficient buck bias power converter capable of supplying up to 2.0A to the load. This high voltage regulator contains an N-Channel buck switch, is easy to implement, and is available in a 10-pin MSOP power enhanced package. The regulator’s operation is based on a constant on-time control principle with the on-time inversely proportional to the input voltage. This feature results in the operating frequency remaining relatively constant with load and input voltage variations. The constant on-time feedback control principle requires no loop compensation resulting in very fast load transient response. The adjustable valley current limit detection results in a smooth transition from constant voltage to constant current when current limit is reached. To aid in controlling excessive switch current due to a possible saturating inductor the on-time is reduced by approximately 40% when current limit is detected. The Power Good output (PGD pin) indicates when the output voltage is within 5% of the expected regulation voltage. The LM25011 can be implemented to efficiently step-down higher voltages in non-isolated applications. Additional features include: Low output ripple, VIN under-voltage lock-out, adjustable soft-start timing, thermal shutdown, gate drive pre-charge, gate drive under-voltage lock-out, and maximum duty cycle limit. Copyright © 2009–2011, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM25011 LM25011-Q1 |
Аналогичный номер детали - LM25011Q |
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Аналогичное описание - LM25011Q |
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