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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 Further to my notice, the part used AON7520 is obsolete.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

Hello PI team, I have been working on Class II medical power supply application using INN3678C-H606 IC. Creepage and clearance constraints are strict for medical applications (IEC60601-1 standards) My question is whether INN3678C-H606 IC is suitable for Class II medical power supply applications. Because on the secondary side, the pin

Hi Pi community and experts. I'm working in a DC/DC buck converter circuit that requieres 15V / 220mA output. The components values were obtained from the PI desing online worksheet. The circuit seems to work, because the output voltage is regulated to the desired voltage. However, a loud switching noise

This is a more general question, regarding the Innoswitch-3 (EP) family: What is the absolute lowest possible working voltage on the primary side? I know the datasheet says 30V on the primary drain to charge BPP. The PI designer says 36V. But what if I supply the BPP externally with

Hi, i would like to check why are the die markings different between this 2, its the same part the date code for the right one is 24+ and left is 21+ is it because of die revision ? if so does it affect the function of the part

Hi, I have depeloped a 50W isolated flyback with INN3678C-H606. Now, for another application, I need to use the same circuit but in not-isolated version. My question is if it is possible to connect the GND pin to the negative pole of the AC bridge rectifier, making a non-isolated flyback

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