PI Forums

I have designed an industrial power supply with 300 VDC input and 24V@1.5A output. As SR-Mosfet I'm using an EPC2204 which might be a little bit oversized, but should improve efficiency. His gate threshold is 1.1V and Rdson around 15mΩ. My problem is, that this SR-Mosfet gets atypically hot. Investigating

Hello, I would like to desing a small AC/DC converter for my project. It should contain cheap components (tiny smd components on a tiny board area). The maximum current should be 50mA with 6V output voltage. I know that there are LinkSwitch solutions for the problem but it has to

Hello, Attached is a screenshot from the oscilloscope showing a voltage pulse from the IGBT. We are using the 2SC0535T2A1-33 IGBT driver, but the turn-on voltage appears to be suboptimal. Does anyone have insights into why this might be happening? Any suggestions or advice would be greatly appreciated. Thank you!

Hi, The datasheet for the 2SC0535T2G0-33 dual-channel IGBT driver indicates that the resistor between REF2 and VE2 determines the overcurrent threshold, with a constant current of 150 μA provided at REFx (schematic attached). In our application, we aim to prevent individual drivers from turning off during an arc event, as

Hi! In the InnoSwitch4-QR datasheet, you find the picture attached to this message as figure6.jpg, which links the current peak to the frequency. I think this is a clear relationship if the system is working in CCM. But what about QR DCM? If the regulator is working in DCM it

Hello, can anybody here tell me the suitable AC/DC switch in a Microwave where only LNK... is still readable? If more information about the modell, design or else is needed let me know. Thanks for any help.

Hello there, We have designed a 24v/5A SMPS using ETD29 Transformer but when it is packed in an ABS body and is made to run at 4Amp it is going into thermal shutdown after 30min please suggest method to reduce heat, we will not be able to increase heatsinks as

I am urgently looking for advice on an ultra-wide input design. I am using a circuit very similar to the reference design DER-712. This raises 3 comprehension questions for me: To what extent does R42 disable the UV/OV feature of the Innoswitch? This is neither mentioned in the datasheets, nor

Hi, Please explain why fail open capacitors are recommended for BPP (Bypass pins) of InnoSwitch (INNO3977)? What all the precautions should we take to use standard capacitors at BPP Pin? Appreciate the sooner response. Regards, Sarvesh

Hi, We wish to have an offline Flyback SMPS, 90-265VAC input. Sometimes we wish it to give two outputs which are isolated from the input by 3500VAC and isolated to 3500VAC from each other. The two outputs are 24V, 2A and 20V, 2A. But also, sometimes (and we can adjust

Hi, Please advise the part number of the gap pad used on page 74 of the following https://www.power.com/sites/default/files/documents/der-712_60w_ultra-wide_input_range_adapter_using_innoswitch3-ep_powigan_mine-cap.pdf

Hi, Please could you advise of an RDK or an DER document which details the TOPswitch flyback with the highest (or the highest you know of) feedback loop bandwidth? I would be very grateful if possible.

Hi, The innoswitch CE datasheet says that switching frequency will end up increasing as load gets heavier, due to the way the current limit gradually falls following the previous FET turn OFF incidence. But then what happens when in QR Mode (BCM)? For this mode, the switching frequency usually gets

Hi, DER535 shows a metal heat spreader being right under the board and separated by insulating pads. To which circuit node does this metal heat spreader connect, or is it just floating? https://www.power.com/sites/default/files/documents/der535.pdf

Hi, I have done a few TOPswitch designs with PI Expert and PI XLS, but it doesnt provide the Bode plots. Do you know why? Years ago it always gave the Bode Plots.

I am using TOP267KG-TL for 4.5 W output. At 19.2V DC converter operating in CCM, But from from 40V above it is operating in DCM. Input: 19.2 - 373V DC & Universal AC input output: 12V, 4.5W Transformer: Primary 24; Secondary 15; Auxiliary 16 ( output voltage 15); Primary magnetizing

Hi, Would be most grateful if your office could list DER notes etc on PI site which discuss innoswitch designs where vout is 23v or more?

Hi, Near the top of page 6 of AN57, Q is said to be set to 0.15. How is this calculated? Which equation is used? I just calculated Q for the DER243 flyback and it comes out as Q = D' x R x SQRT(C/L) = 25.8 for DER243 at

Hi, Every time i try and do a TOPswitch JX design in PI Expert or PI XLS, it always reverts to Innoswitch even though i chose TOPswitch JX. How do you stop this?

在使用PI Expert Online 设计软件时输入与RDR-767 7W DEMO BOARD同样的设计参数，但有关变压器部分的设计数据与DEMO应用指南不一样，差距很大，不知道是什么原因？请予解释。