For those who want to know how it work a SMPS is a very good paper. You will find about: SELECTION OF FLYBACK AND FEEDBACK CONTROLLERS SELECTION OF THE MOSFET ( MOSFET Breakdown Voltage ) SELECTION OF THE OUTPUT DIODE SELECTION OF THE TRANSFORMER HOW TO DESIGN A GOOD SWITCHING TRANSFORMER FOR LOW-POWER APPLICATIONS SNUBBER NETWORK DRAIN CLAMP Setting Output Voltage and Current Limiting FLYBACK SMPS MODE OF OPERATION I mention just a few things here, the rest you will discover yourself 126 downloads. Average Current Mode Control of Switching Power Supplies, Lloyd Dixon Unitrode 1999 Abstract Current mode control as usually implemented in switching power supplies actually senses and controls peak inductor current. This gives rise to many serious problems, including poor noise immunity, a need for slope compensation, and peak-to-average current errors which the inherently low current loop gain cannot correct.

Average current mode control eliminates these problems and may be used effectively to control currents other than inductor current, allowing a much broader range of topological application. 82 downloads. Off-Line SMPS Failure Modes PWM Switchers and DC-DC Converters Dan N. Bennett Analog & Mixed Signal Solutions ABSTRACT Today’s voltage regulator modules (VRMs) employ off-line SMPS techniques. Traditionally, they are usually discarded when they fail because they are so challenging to debug and so inexpensive to replace. Investigation of these failed modules reveals some common failure modes.

Ferrite Transformer Turns Calculation for High FrequencySMPS Inverter Using the from ELECTRICAL 640 at COMSATS Institute of Information Technology, Abbottabad. Re: sg3525 and ir2110 smps problem don't use a light bulb load, unless your circuit is intended to power incandescent bulbs, built a current limit and soft start into your circuit, use buffers on the o/p's of the 2110, bigger fets are easy to get, look at fairchild.

Some failures are caused by other systems’ passive components that fail after repeated electrical stress. Recognizing these common failure modes brings new life to a switch-mode power supply. Contents Off-Line SMPS Operation................................. 2 Solution—Common Power Supply Failures........................ 4 Testing and Repair..................................

5 Negative Voltage Output Too High........................... 6 Output Capacitor Replacements............................ 6 Output Diode Replacements.............................. 6 Substitute Diodes................................... 6 Conclusion....................................... 6 92 downloads. Design Review: A 300W,300KHz Current-Mode Half-Bridge Converter with Multiple Outputs Using Coupled Inductors by Roger Adajr Table of Contents Introduction Specifications Topology; half bridge with current mode control.

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Advantages and disadvantages. Stability of half bridge converter using current mode control. Solution of stability problem. PWM control stage and gate driver circuit. Power stage and transformer design.

Current mode control and slope compensation. Coupled inductor design Feedback loop.

References This paper gives a practical example of the design of an offline switching power supply. The half-bridge topology is used with current mode control. Until recently this was considered an unstable combination, but a simple compensation circuit is now available and is described in this paper. This power supply has two outputs and uses a coupled inductor.

Using a coupled inductor with a current mode controlled buck type topology is especially helpful, as will be explained later. 144 downloads.