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Hi, We are using TFS7707H for generating 12V@15A as a supply for our telecom products. We are facing field failure of IC TFS7707H (IC blast). We are not able to find the root cause of failure of this IC tfs7707h. We suspect the wrong selection of series resistor R2 and

Hi, I am using CPZ1061 instead of CPZ1075 in a design suggested in DER-943, as CPZ1075 wasn't readily available in my part of world. While testing I found that at the first time powering up the SMPS starts OK, gives desire output and works fine. But as soon as I

Hi I have recently published my new article to INN369the x application. The target was the more simple design with the planar transformer. (the additional winding for INN3xxx will not be necessary). https://www.researchgate.net/publication/389701973_The_effective_replacement_of_the_bias_winding-coil regards zbyno

Hi, I'm working on a project and I'm using 2SC0115T2A0-12 for driving an H-bridge ACDC Active front end. I'm following all the recommendations given in the application notes. The sinusoidal PWM of 1kHz that I'm using, when I check on the input to the gate driver is very clean and

Hello there, We have been manufacturing this 24V/5A SMPS for a very long time having an input voltage of 195-285 VAC but one of our clients needs the same in 85-265 VAC please suggest ways to convert this into a universal Input SMPS. We are ok with the new transformer

Hi, Can someone help me to choose Rg,n and Rg,off resistors on 2SP0115T2A0 for Infineon FF300R12ME7_B11

Hi, My company are using LNK3202 as a HV Buck. UK Mains down to 12V. They have accidentally put C3 (below on page 5) as 220nF MLCC instead of a 10uF electrolytic. They have shipped many products like this by accident. What could be the possible effects? Page 5 schem

We built a 5V PSU on TNY286KG-TL following the Application Note AN-82 TinySwitch-4 Family Design Guide. It works fine, but has very slow transient response. The recommended combination of CFB2 and RS1 places the crossover frequency very low (even much lover for higher output voltages), which results in poor transient

Hello, I wound a transformer for a LYT5228D circuit, according to the ACDC_LYTSwitch5_Buck_051424; Rev.2.0 design spreadsheet and its associated magnetics designer. I wound it exactly according to the spreadsheet (see attached a screenshot of the relevant sections of the spreadsheet). However, it causes strong radiated emissions as measured with our

Hi， 1）Can I change the number of valleys in QR mode to start conduction? 2）How do I change from DCM mode to CCM mode? Need to change the parameters of the load? Regards, Jun Yi!

I can not access TopSwitch II spreedsheet for a new design. Has someone a copy for that spreadsheet? I know Power Int is suggesting new models for new designs but my client insist to have a product using Top226yn. thanks in advance...

AC/DC converter for a controller of electrical appliances. 6-8 Watt, 12V DC output, Isolated, input voltage 90-265V, Breakdown voltage 750-900V. Low component count. Open frame.

I developed a power supply with two outputs (12V) and (36V) using TOP270EG. When I apply a load only at 12V, the PWM acts to keep the voltage constant, but this causes a voltage rise at the 36V output. When I apply a load only at the 36V output, the

Hi, 1) I got more ringing at output of INN3977CQ circuit during load transient. How to reduce ringing in the load transient conditions. 2) How to update the design as INN3977CQ is integrated device if any phase/gain margin improvement findings in Bode plot during testing. Can you share reference bode

Hello PI Expert, Can you please explain the role of MOSFET Q3 connected at the output side of the flyback converter? I have observed that the power adapter works fine even when Q3 is shorted. Further to my notice, the part used AON7520 is obsolete. Can you suggest an alternate

Hello there, We are in the process of designing an AC-DC converter with the requirement of converting 214 DC from a Bridge rectifier to 5V DC at a power rating of 15W. After thorough evaluation, we have determined that the TNY279P flyback controller is the most suitable for our needs

Dear Power Integrations Team, We are working with the INN3688-H302 and referencing the DER-1024 design. After implementing the circuit on a custom PCB, we are encountering the following issues: No output voltage on the secondary side. No switching observed across the Drain-Source terminals. The BPP pin voltage is 5.388V. No

Hi there. Is there a way to estimate the total losses in a device like the INN4276? The only thing you find in the family datasheet is the Figure 22, which links power to drain voltage without specifiying at what frequency if was obtained. Thanks.

Hi, I'm working on a design where I have an InnoSwitch4-QR and a 24V output. The datasheet says that the SR FET driver uses the SECONDARY BYPASS pin for its supply rail, and this voltage is about 4.5 V, therefore SR FETs with a gate voltage threshold voltage range Vgs(th)

Greetings, I would like to ask, if You have available any driver ICs capable of delivering high output voltages in range between 150 and 250V. I'm interested in converters that can achieve this with 230V mains, switching frequency above 20kHz and output current between 20 and 30mA. I worked with