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Buck / Step Down Power Supplies, Page 2
Buck: Page 1, Page 2, Page 3,
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Last Updated on:
Friday, July 18, 2008 11:33 AM
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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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Capacitor Improves Efficiency in CPU Supply: 04/04/02 EDN Design Ideas
/ (added 3/05) High efficiency is important for the dc/dc buck converters that supply high currents in notebook PCs. This efficiency
extends battery life and minimizes temperature rise. A low-dissipation synchronous rectifier using an external MOSET provides this high
efficiency. Synchronous rectifiers require special attention, however. ... |
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Cheap PWM IC Makes Synchronous Gate Driver: 02/04/99 EDN-Design Ideas /
(added 6/06) A system with a µP, memory, and peripherals usually requires several power-supply voltages. Designers typically use local switching
regulators to produce the desired voltage rails. One of the most common topologies, the synchronous buck regulator, converts a 5 or 12V bus to
some other, lower voltage. This approach... |
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Configure buck converter for boost operation : 12/17/98 EDN-Design Ideas
/ (added 2/06) Buck converters are inherently different from boost converters, because buck converters typically use the high side of
the output as the power switch’s reference. However, a buck converter with a floating output drive section is configurable as a boost controller
(Figure 1). This circuit configures the SC1101 buck controller for a 5 to ±12V boost with ±500 mA of output current. The BST pin, which normally
connects to a high-side drive supply in a buck converter, connects to VCC to drive the ground-referenced MOSFET. By tying PGND to circuit ground,
the SC1101 becomes a boost controller, yielding 12V from 5V. An output charge-pump voltage inverter provides –12V at 0.5A as well.... |
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Constant on Time Buck Boost Regulator Converts a Positive Input to a Negative Output:
12/07/04 EDN Design Ideas / (added 11/05) Buck regulators find wide application as step-down regulators for converting large positive input
voltages into a smaller positive output voltages. Figure 1 shows a simplified buck regulator that operates in continuous-conduction mode—that is,
the inductor current always remains positive. The output voltage, VOUT, is equal to D×VIN, where D is the duty-cycle ratio of the buck switc... |
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Controller IC and One Shot Form Resonant Controller: 11/28/02 EDN Design
Ideas / (added 1/05) Resonant power supplies are popular because of high efficiency, low noise, and compactness. You can
implement a resonant buck or boost converter using a single switch. The regulation of the output in such a converter derives from using a constant
on or off time and a variable frequency. The UC1864 controller IC (Texas Instruments, www.... |
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Design Procedure for MicroProcessor Buck Regulators (AN-10): Application Note
10 from Microsem (app note added 6/06) |
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Designing a Multi Phase Asynchronous Buck Regulator using the LM2639:
National Semiconductor Application Note 27 Mar2000 (app note added 7/02) |
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Double Data Rate Power Supply using the Tl5002 Voltage Tracking Regulator:
The TL5002EVM-180 synchronous buck converter provides a 12A reference design for evaluating the performance of the TL5002 PWM control IC and the
TPS2837 MOSFET driver for Double Data Rate (DDR) memory applications. (added 3/05) |
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Dual High-Current Power Supply Kit: The National Semiconductor Power Supply
Kit is designed around the National LM2636, a synchronous buck regulator. It provides over 28 amps of current with variable output voltages
ranging from +1.3V to +3.3V. (added 3/05) |
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Dual Monolithic Buck Regulator Provides Two 1.4A Outputs with 2-Phase Switching to
Reduce EMI: DN305 - Design Notes (Linear Technology) (app note added 1/06) |
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EP48 12 V 1.44 W Non-Isolated Buck Converter: This design kit is a
non-isolated 12 V, 120 mA power supply utilizing a LNK304. This power supply is intended as a general purpose evaluation platform for
LinkSwitch-TN in a buck converter configuration. (added 7/06) |
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Extend the input range of a Low dropout regulator: 10/17/02 EDN Design Ideas
/ (added 1/05) Because of process limitations, all ICs have an input-voltage limitation. This limitation can be cumbersome when you
try to step down a high supply voltage to a lower, regulated voltage using a dc/dc converter, such as a linear regulator. Adding a FET to the
input of a linear regulator creates a dc/dc converter with a wider input-voltage range than the range of the regulator alone.... |
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