• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 63 subscribers
  • Views 184 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

UCC14241-Q1: Is UCC14241-Q1 possible to use for explosion proof equipment(24V⇒3V 0.4A）

Shinichi Inoue
Guru 21131 points
Part Number: UCC14241-Q1

Tool/software:

Dear Specialists,

My customer is considering UCC14241-Q1 and has a question.

I would be grateful if you could advise.

---

I am thinking about using it for explosion-proof equipment.

IEC 60079-11:2011 is used for the standard required distance between the primary and secondary power supplies.

I am thinking of using Vin 24V → Vout 3V, Iout 0.4A.

The standard value of 30V will be used, so the following specifications are required.

Can the UCC14241-Q1 satisfy the following specifications?

(Between pins) Insulation clearance: 2.0mm
(Between pins) Creepage clearance: 2.0mm
(Inside IC) Insulation clearance: 0.2mm

I think the insulation clearance between pins and the creepage clearance between pins are satisfactory, is it correct?

I was unable to confirm the insulation clearance inside the IC in the data sheet, could you please let me know.

ｰｰｰ

I appreciate your great help in advance.

Best regards,

Shinichi

  • +1
    TI__Mastermind 30915 points

    Isolation voltage rating include creepage clearance distances, as they apply to using the device in a PCB, are given in the data sheet. Internal insulation clearance as well as materials used to achieve the isolation specified in the data sheet are considered TI proprietary information and not generally shared with the public.

    Also your requirement for 24V to 3V/0.4A cannot be met by any TI IIB (Isolated Integrated Bias) device. Please pay attention to the voltage conversion limits to help decide if IIB devices are the best choice for your application. If you are interested in IIB solutions, you will either need to pre-regulate the 24V input and/or post regulate the output to 3.3V.

    Another option could be TI Transformer Drivers but these are open loop (unregulated) drivers with integrated MOSFETs and the solution uses a small external isolation transformer. 

    Steve

  • 0 in reply to Steven Mappus1
    Guru 21131 points

    Hi Steve,

    Steven Mappus1 said:
    Internal insulation clearance as well as materials used to achieve the isolation specified in the data sheet are considered TI proprietary information and not generally shared with the public.

    I understand.

    Even if the output voltage is increased from 15V to 25V, it cannot be considered an explosion-proof device if the internal insulation clearance is not disclosed.

    I will introduce a transformer driver to the customer to see if they can consider it.

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi

  • +1 in reply to Shinichi Inoue
    TI__Mastermind 30915 points

    Section 7.5 of the UCC14241 data sheet provides the internal insulation clearance (DTI, Distance Through the Insulation). There are two isolation components to consider: (1) Transformer provides power isolation (2) capacitive feedback provides signal isolation. 

    Steve

  • 0 in reply to Steven Mappus1
    Guru 21131 points

    Hi Steven,

    Thank you for your reply.

    I'll share this information with the customer.

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi