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Hi, i made a 10w circuit using lnk6666e and its working fine except one thing if i use feedback resistor 39k than input lower cut off is 60V and higher cutoff is 290v and if i use 68k than AC low cutoff is 120V but high cut is not working

Hi Friends, I have designed 32V 7A SMPS using with Pıexpert. According to PIExpert, the transformer's leakage inductance should be 3.5uH, but I measure 7uH in the transformer I designed. 1. Is this a big problem for transformer design? 2. Will this problem prevent the circuit from working? 3.What kind

Hello, I am designing power supply with TNY284P, and I would like to calculate MTBF according to MIL-HDBK-217F. I can measure voltage/current/temperature, but I don't know which parameter I should use. Please let me know how to proceed the prediction. Thank you.

My english is not good but I hope everyone can understand and help me explain the problem. Thank you very much! I am learning the TOPSwitch-Jx IC family to design an SMSP . When reading the datasheet about the soft start part, there is a problem I do not understand

Hi Sir: 1\As the note in datasheet, "When the duty cycle exceeds DCMAX the LinkSwitch-CV operates in on-time extension mode." , what would the switching frequency be in on time extension mode? 2\we found the switching frequency is around 80khz, far below 100khz when duty cycle didn't exceed DCMAX, do

Hi I am trying to reduce the component cost of the 12V supply that is used for a PFC 24V AC-DC converter. Currently my design uses the LinkSwitch circuit similar to RDR-506 (TN2 LNK3204D/P/G) as an auxilary 12V supply for the PFC. What less expensive alternatives do you suggest? Thank

Hi. I`m the student developer who is frequently using your product. While Using Pi Expert Online, Part MCU raise my curiosity. If MCU is not specified, than I can use any microcontroller including USB HUB? The schematics your company provide uses vp302 but no VP302 datasheet is found in the

Hello, In the TOP258YN chip (132kHz) design that we have designed in PI expert, it indicates the cross-section of the cable used in the primary winding of the transformer as 24 AWG. However, as can be seen in the table with cable properties in the appendix, the skin effect occurs

Hello I used TNY280 in 12V-2.2A power supply. In light loads for example in 70mA, it makes annoying noise sound in treble range (high frequency noise sound ). But in high load the noise sound changes from high frequency to lower freq. that is not very annoying. How can I

Please help me with design of fully isolated scheme with HighLine. Normal input is 230, but necessary save efficiency when two power lines will be 230V (√3*230=397V). I want find solution on power supply with characteristics 180-430VAC input, Output 12V5W Your design recommendations mostly 300VAC maximum