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Technical Articles
Browse selection guides, application notes and practical power supply articles. This layout follows the previous WordPress blog structure while preparing space for the larger article library.
A DC-DC converter can pass a room-temperature bench test and still oscillate after an output capacitor substitution or a change in customer load. When that happens, replacing compensation resistors at random makes the investigation difficult to reproduce. Start by identifying the instability, model the actual power stage, and adjust the loop with a measurable target.
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A replacement MOSFET fails the moment a repaired power supply starts. The transistor may have been correctly identified, yet the fault that overstressed it is still on the board. A damaged gate resistor, a defective clamp, or a broken current-sense connection can turn a straightforward component replacement into another failure.
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A 24 V power supply reads correctly on the bench, but the voltage falls when a motor drive, valve bank or downstream converter starts. Replacing it with a higher wattage model may hide the symptom. It can also leave the actual fault, such as a resistive connector or excessive startup current, untouched.
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When engineers compare switching power supplies, the first screen is usually simple: input range, output voltage, output current, package size, and price. Those numbers are necessary, but they do not tell you how the power supply will behave inside a real machine.
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Unstable SMPS output can come from feedback sampling, loop compensation, output capacitor behavior, VCC supply, power-stage margin, PCB parasitics, light-load burst mode, or snubber resonance. This guide gives a practical order for finding the cause.
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A practical guide to non-magnetic causes of SMPS output noise, including MLCC vibration, PCB resonance, poor contacts, loop instability, rectifier ringing, safety capacitors, and load interaction.
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