SMPS using INN3694C

Hello Jayashree,

Good day and thank you for continuously using Power Integrations product.

Since your maximum input voltage is only 265 VAC, instead of using INN3694C (900 V), I highly suggest using INN3675C (725 V). Kindly refer to the attached file for the initial PI Expert that I made, which corresponds to your input and output specifications. As you may notice, I have connected a 220 k ohm resistor between the BPP pin and the V pin, and the reason for this is to widen the UV and OV range since you have a 65-265 VAC input. You can also remove both V pin resistors (R5 and R6) and directly short the V pin to the SOURCE pin to disable both UV and OV protection if it is not required. I have also used the EF20 core for the transformer since the E20/10/6 core is also equivalent to the EF20 core.

Here's the link as well if you wish to play around with the initial design: https://piexpertonline.power.com/piexpert/design/select?share=d0b5eaa1d2a3cc128e00c2a2d6c8eadb83ad156391e682427f537a553c40e8d3

On a different note, if you still wish to use the INN3694C for the design, please let me know and I'll update the design for you.

Thank you and I wish you a great day.

Regards,

Tommy

Hello Jayashree,

Good day and thank you for continuously using Power Integrations product.

Since your maximum input voltage is only 265 VAC, instead of using INN3694C (900 V), I highly suggest using INN3675C (725 V). Kindly refer to the attached file for the initial PI Expert that I made, which corresponds to your input and output specifications. As you may notice, I have connected a 220 k ohm resistor between the BPP pin and the V pin, and the reason for this is to widen the UV and OV range since you have a 65-265 VAC input. You can also remove both V pin resistors (R5 and R6) and directly short the V pin to the SOURCE pin to disable both UV and OV protection if it is not required. I have also used the EF20 core for the transformer since the E20/10/6 core is also equivalent to the EF20 core.

Here's the link as well if you wish to play around with the initial design: https://piexpertonline.power.com/piexpert/design/select?share=d0b5eaa1d2a3cc128e00c2a2d6c8eadb83ad156391e682427f537a553c40e8d3

On a different note, if you still wish to use the INN3694C for the design, please let me know and I'll update the design for you.

Thank you and I wish you a great day.

Regards,

Tommy

Hi Tommy,

Thank you for the response. There is a change in the design specifications. The maximum input voltage is 300V. 

Kindly let me know if the changes that you suggested are still applicable or not. 

And yes, I do wish to continue with INN3694C. Help me with the design for the same.

Warm regards

Jayashree

Hello Jayashree,

Good morning. Got it. Thanks for mentioning that the maximum input voltage has been increased to 300 VAC.

Kindly refer to the attached file for the updated design utilizing the INN3694C. As you may notice, the InnoSwitch3-EP device used in the design is INN3674C, but this should work just fine when you implement the INN3694C since they both have the same current limit.

Another thing is that I have updated the values of the V pin resistors R5 and R6 and the resistor between the BPP and V pin because the maximum input voltage is increased. You will notice that I have placed a series diode with the resistor connected between the BPP pin and V pin. This is to ensure that the flow of current will always be from BPP to V pin. As mentioned in my previous comment as well, you can remove both V pin resistors (R5 and R6) and the series diode + resistor between the BPP and V pin, then short directly the V pin to the SOURCE pin to disable both UV and OV protection if it is not required.

Here's the link to the PI Expert design if you wish to play around with the parameters and change some components: https://piexpertonline.power.com/piexpert/design/select?share=d0b5eaa1d2a3cc128e00c2a2d6c8eadb83ad156391e682427f537a553c40e8d3

I also want to mention that the only H-code available for the INN3694C is H606. Please refer to the attached image for the features available for the H-code H606.

Before manufacturing the actual prototype board, you can also share with us the final schematic and PCB layout so we can review it and give feedback.

Let me know if you need any other help or have any more questions. Thank you, and have a great day ahead.

Regards,

Tommy