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LM25011-Q1 Scheda tecnica(PDF) 10 Page - Texas Instruments |
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LM25011-Q1 Scheda tecnica(HTML) 10 Page - Texas Instruments |
10 / 29 page SS RT FB VIN SW VIN BST L1 CBST D1 SD CS LEVEL SHIFT ON TIMER FINISH START LOGIC Gate Drive UVLO 5V REGULATOR Input CL CL 2.5V REGULATION COMPARATOR LM25011(A) 10 2A CURRENT LIMIT COMPARATOR FINISH START OFF TIMER THERMAL SHUTDOWN FCIC CONTROL PGD 2.375V 0.8V RPGD CSG Power Good 125 mV UVLO SGND RS + - CURRENT LIMIT THRESHOLD + - 6V to 42V CBYP CIN RT CSS COUT VOUT RFB2 RFB2 + - + - Pre - Chg LM25011, LM25011-Q1, LM25011A, LM25011A-Q1 SNVS617H – APRIL 2009 – REVISED NOVEMBER 2014 www.ti.com 7 Detailed Description 7.1 Overview 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 2.0 A to the load. This high-voltage regulator contains an N-Channel buck switch, is easy to implement, and is available in a 10-pin VSSOP, PowerPAD power enhanced package. The operation of the regulator 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 the 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. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Control Circuit Overview The LM25011 buck regulator employs a control principle based on a comparator and a one-shot on-timer, with the output voltage feedback (FB) compared to an internal reference (2.51 V). If the FB voltage is below the reference, the internal buck switch is switched on for the one-shot timer period which is a function of the input voltage and the programming resistor (RT). Following the on-time, the switch remains off until the FB voltage falls below the reference, but never less than the minimum off-time forced by the off-time one-shot timer. When the FB pin voltage falls below the reference and the off-time one-shot period expires, the buck switch is then turned on for another on-time one-shot period. 10 Submit Documentation Feedback Copyright © 2009–2014, Texas Instruments Incorporated Product Folder Links: LM25011 LM25011-Q1 LM25011A LM25011A-Q1 |
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