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LMZ14201H: LMZ14201H power module has any known issue wrt Radiated Susceptibility @ DO-160

Anantha PN
Prodigy 20 points
Part Number: LMZ14201H
Other Parts Discussed in Thread: MSP430FR5994,

Hello All,

 

We are using LMZ14201HTZ/NOPB (SIMPLE SWITCHER® 6V to 42V, 1A High Output Voltage Power Module) on one of our Aviation product ( With Speaker for Chime tone, this product using MSP430FR5994 as well).

Which has to be comply with RF Susceptibility tests as per section 20.3a of DO-160G.

 

As of its Switching frequency configured to 350 to 384Khz.

While doing Radiated susceptibility test, we are seeing some unwanted noise coming from speaker ~ 360Mhz to 522Mhz onwards  ( power level 150V/m as per DO-160G table below)

 

We need to know, any of you faced these type of issue (LMZ14201H power module has any known issue wrt Radiated Susceptibility @ DO-160)

 

 Thanks in advance

 

Best Regards

Anantha PN

  • 0
    TI__Guru 50120 points

    Hi Anantha,

    What I can say about the LMZ14201H is that the radiated EMI test on an evaluation board for 12V output is well below the EN55022 / CISPRR 22 Class B limit line based on Figure 44. Of course this may be different in your application depending on PCB layout, EMI mitigation techniques, component placement, local external switching sources, etc. 

    If you are seeing unwanted noise from at that high of a frequency (360MHz - 522MHz) perhaps it may be necessary to attach a to include a high frequency input EMI filter reference from the SNVA834 App note (input filter discussed in Section 2.2.5). Attaching the EMI input filter not only helps with conducted EMI but also with radiated EMI. 

    Regards,

    Jimmy 

  • 0 in reply to Jimmy Hua
    Prodigy 20 points

    Dear Jimmy,

    Thank you for your email. There is variations on EN & DO certification limit line

    We will cross check ur document.

  • 0 in reply to Anantha PN
    TI__Guru 50120 points

    Hi Anantha,

    Please keep me informed with your updated results. Let me know if you need anything else. 

    Regards,

    Jimmy 

  • 0 in reply to Jimmy Hua
    TI__Guru 50120 points

    Hi Anantha,

    Can you give me any updates on your results. Otherwise this thread will be closed due to inactivity. 

    You can contact me directly at j-hua@ti.com if you need any further assistance with this.

    Regards,

    Jimmy