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LM25011AQ データシート(PDF) 9 Page - Texas Instruments

部品番号 LM25011AQ
部品情報  42V 2A Constant On-Time Switching Regulator With Adjustable Current Limit
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ホームページ  http://www.ti.com
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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
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Product Folder Links: LM25011 LM25011-Q1


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