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TIDA-01455: TIDA-01455 REV E1 Bill of Materials

Jonathan Navor
Genius 9475 points

Part Number: TIDA-01455

Hi Team,

Greetings, We need your help to check customer's concern below. 

----

There are two things that catch my eye in the TIDA-01455-E1 (001) _TI-BOM.pdf list.

A. Listed as Q1;
1200 V
IGW03N120H2
Infineon Technologies
Transistor, IGBT, 1200 V, 9.9 A, TO-247
TO-247
why was the product above used?

B. In the same list of materials; C50, C51
listed as;
3uF
MKP1848C53012JK2
Vishay-Bccomponents
CAP, Film, 3 μF, 1200 V, +/- 5%, 0.015 ohm, TH
32x18mm
there is a capacitor. this is like the q1 transistor, 1200V.

Does it have any special meaning to be 1200V? Because other system components max 600V.

But these 3 materials; (q1, c50 and c51) 1200V is selected.

What will happen if a value such as 450V is selected as a capacitor? because of the high pwm frequency anyway, the back emf will be very low. 

---

Thank you in advance for the support. 

Best regards,

Jonathan

  • 0
    TI__Expert 3580 points

    Hello Jonathan,

    thank you for your interest in the TIDA-01455. 

    Your questions are very valid.

    Regarding Q1: I recall the designer (he left TI) used a DC power supply, which could not sink current and the VBUS capacitors of 6uF are quite low. So Q1 (brake IGBT) was only added as internal protection option to dissipate the high-speed motor's kinetic energy during fast braking and therefore reduce the VBUS voltage increase during braking. 

    I agree, a 600V rated low-side power switch (IBGT or FET) should be sufficient, since the LMG3410 is rated 600Vmax too. The current rating depends on maximum discharge current (bleeding resistor between brake IGBT and VBUS) while keeping VBUS less than 480V.

    Regarding C50, C51: 600VDC rated capacitor should be sufficient. Since these products are not from TI, I'd like to refer you to the specific vendor of your choice.

    Other than nominal DC bus voltage (e.g. 320V for rectified single phase 230VAC mains), we may also consider the VBUS dynamics during motor acceleration and braking, This will add an AC voltage component on top of the VBUS. This is system specific and should be checked when choosing an appropriate VBUS capacitor.

    Regards,
    Martin Staebler