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Smps Driver Ic

Thank you for kind information. This solution I see in similar datasheets from same manufacturer. There are huge bursts of oscillation? Nason Lighting Kunshan Co.

Measuring tiny spikes on the high-side is notoriously difficult without a good scope and a high-bandwidth differential probe. If you have a storage scope, monitor the low-side gate drive and do what you need to do to make the unit blow.

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Sir is that any possible to make it on this kind of lights. Adding an external, fast and high-voltage bootstrap diode might help. The common thread in what you've described is that at a certain point when overloaded, the power supply blows up. Where did you get the main transformer from?

SMPS LED Drivers Advantages and Disadvantages

Self resonance frequency is that high because parasitic capacitance of coil is in pF range. This also rules out transformer saturation. The electrolytic capacitors are extremely sensitive to the working temperature and have a limited lifetime. This might cause it to do weird things.

Let's Start Discussing below! My understanding that fail mode is lossless ringing of grounded disconnected coil when high side of coil is floating and dissipating on nearly infinite impedance. May there be eg leakage reactance coupling to Vs?

Email Required, but never shown. But flyback circuits are way more expensive, and with much more parts count, increased size, reduced efficiency.

Constant Current and Load Regulation Objective

Your Answer

They seem to track each other, as would be expected if the high side driver is floating relative to Vout. Another possibility could be that you are exceeding the maximum slew rates for the high-side driver. In the switching of the big output driver, the charging and discharging of output driver waste a good amount of energy. Why the burst is delayed by ns is a mystery. Switching stops and the supply should settle to a safe, s3 unichrome pro igp driver windows 7 quiescent state.

The failures happen during overload, when the supply is making audible screaming noises and the output voltage has dropped because it's switching below the resonant frequency, right? Note that the calculation in Eq. The pulsating sine voltage here faithfully follows the pulsating sine current. Switch mode power supplies may also be considerably lighter and smaller than a linear supply owing to the smaller transformer size and weight.

Constant Current and Load Regulation Objective

Also, I have edited the answer for another possible mode of failure. Once the circuit goes into overload, you say that the frequency drops. Lutec Unite Outdoor Wall Lantern. The more often you charge Qg, the more current needs to be provided. If not, there's a fundamental issue with the implemented protection mode nothing to do with the overload itself.

It's starting to appear that the supply simply doesn't like to be inhibited or otherwise constrained. But that is another theory of operation in fail mode. Sir one more request Can you give me low cost circuit using voltage dropping capacitor? All the energy is discharged to the ground in the form of heat. What is the role of moderators?

Your Answer

Datasheet shows it as a supply overvoltage shutdown. Not sure if it's a progressive damage thing that eventually results in failure or a random spike that exceeds a limit. Some magnetics are rated to go well over C without ill effects. Check the voltage across the bootstrap capacitor.

Sengled Optoelectronics Co. But the low-side gate did not short. Furthermore, the switching loss is the biggest problem. The theory that Vout is floating up to Vin is unlikely, unless everything on the Vout rail is also blowing up when the primary goes.

The main transformer is custom and was getting excessively hot, so we had them use a bigger one. Perhaps the range of frequencies is too broad? It's a better idea to use the max. You'll be able to see things like frequency change, erratic control, etc.

Same as when i switch on our computer ups as we hear beep tone. Switch mode power supplies may have relatively high power conversion efficiency, as opposed to other types of power converters.

7 Watt LED Driver SMPS Circuit - Current Controlled

Home Questions Tags Users Unanswered. Latter is more expensive, but more power efficient. Shenzhen Surmountor Lighting Co.

Smps driver ic

SMPS LED Drivers Advantages and Disadvantages