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Buck / Step Down Power Supplies, Page 4
Buck: Page 1, Page 2, Page 3,
Page 4, Page 5
Last Updated on:
Friday, August 29, 2008 02:33 PM |
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Power Supplies -- Main Page
Converters -- Main Page |
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electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
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LDO Buck/Boost 2 Sync Buck Sync Boost Reference Design: LDO, Buck/Boost, 2
Sync. Buck, Sync. Boost with Vin 2.7-4.2 V LiION or 4.5-6.5 V adapter. Multiple output voltages of 1.5 V, 2.5 V, 3.3 V and 8 V. The total output
power is 5.5 W. (added 3/05) |
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LED Buck PFM: Powers LED with Constant Current Starting at 100MV over
VF: This is a proof of concept circuit which needs improvement. The part values shown will run a high efficiency red LED with a Vf of
1.9V from only 2 nicads, right down to 2 volts. For a white LED you will need more batteries and you must increase the 1.0K resistor to a higher
value. Current sensing at a mere 18mV over 1ohm makes this stepdown switcher efficient, but efficiency can be increased by using a larger
inductor, improving transistor switching speed, or by increasing the value of the 1.0K resistor. ... (added 2/05) |
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LED Headlamps : This article includes circuits of DC-DC LED drivers step
downs to run LEDs on less than Battery Volts, Boost for above. (added 4/02) |
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LM2675 5.0EVAL 1 Amp Step Down High Efficiency Simple Switcher Evaluation Board:
National Semiconductor Application Note 10 Feb1999 (app note added 7/02) |
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Low EMI Synchronous DC/DC Step-Down Controllers Offer Programmable Output Tracking:
DN382 - Design Notes (Linear Technology) (app note added 1/06) |
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Lower DC/DC Converter Ripple by using Optimum Capacitor Hookup: 10/31/02 EDN
Design Ideas / (added 3/05) Low-ripple-voltage positive-to-negative dc/dc converters find use in many of today's high- frequency
and noise-sensitive disk drives, battery-powered devices, portable computers, and automotive applications. Like a positive buck converter, a
positive-to-negative converter can have low output-ripple voltage if you place the bulk input capacitor between VIN and VOUT rather than between
VIN and gr...... |
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LT1074/LT1076 Design Manual: AN44 - Linear Technology - This note discusses
the use of the LT1074 and LT1076 high efficiency switching regulators. These regulators are specifically designed for ease of use. This
application note is intended to eliminate the most common errors that customers make when using switching regulators as well as offering insight
into the inner workings of switching designs. There is an entirely new treatment of inductor design based upon simple mathematical formulas that
yield direct results. There are extensive tutorial sections devoted to the care and feeding of the Positive Step- Down (Buck) Converter, the
Tapped Inductor Buck Converter, the Positive-to-Negative Converter and the Negative Boost Converter. Additionally, many troubleshooting hints are
included as well as oscilloscope techniques, soft-start architectures, and micropower shutdown and EMI suppression methods. |
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LT1339 Design Manual: AN73 - Linear Technology - This application note
contains detailed design information to allow the reader to craft switching regulators using the LT1339 high power synchronous DC/DC converter.
The note provides expanded pin descriptions for the LT1339 as well as easy-to-use graphical tools for the design of high power synchronous buck
and boost converters. The manual includes extensive information on the LT1339 and the external components used with it along with formulas and/or
graphics to calculate component values. |
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LT1777 High Voltage Low Noise Buck Switching Regulator: DN212 - Design
Notes (Linear Technology) (app note added 1/06) |
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LTC1265: A New High Efficiency Monolithic Buck Converter: DN105 -
Design Notes (Linear Technology) (app note added 1/06) |
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Monolithic Step-Down Regulator Withstands the Rigors of Automotive Environments and
Consumes Only 100µA of Quiescent Current: DN378 - Design Notes (Linear Technology) (app note added 6/06) |
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Monolithic Synchronous Step-Down Regulators Pack 600mA Current Rating in a ThinSOT
Package: DN300 - Design Notes (Linear Technology) (app note added 6/06) |
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No Design Switching Regulator 5V 5A Buck (Step Down) Regulator: DN48 -
Design Notes (Linear Technology) (app note added 1/06) |
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No Design Switiching Regulator 5V Buck-Boost (Positive to Negative) Regulator:
DN49 - Design Notes (Linear Technology) (app note added 1/06) |
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Notebook Power Supply has Two Outputs: 03/03/94 EDN-Design Ideas / (added
3/06) The notebook-computer supply in Fig 1 powers the 5V logic and derives an adjustable -24V supply for an LCD's backplane. The design uses only
a high-efficiency buck regulator (Si9150) and an NMOS/PMOS, dual-power-FET chip set (Si9943), eliminating the extra parts required when you
implement both supplies independently. Because of the low on-resistances of the dual FETs, this circuit can achieve better than 92% efficiency at
7.2V input and full-load output (7.6W).... |
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