• State Resolved
  • Locked Locked
  • Replies 10 replies
  • Answers 1 answer
  • Subscribers 64 subscribers
  • Views 3033 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

TPS55332-Q1: About Max Output Current of TPS55332-Q1

Pokkun
Genius 4695 points
Part Number: TPS55332-Q1

Hi member.
I want to introduce TPS55332-Q1 to the customer, now.
But I wouldn't know to be able to use about this product at below specification, or not.
So, please teach me.

＜Specification＞
VIN：28V
VOUT：50V
IOUT：2A

At first, I want to know if it can support the load current（2A）.

I'm sorry if I make a mistake to watch.
But I think that there are no calculation formulas on the data sheet.

Could you help us?

Best Regards,
Masumi Sekiguchi

  • 0
    TI__Genius 13700 points

    Hello,

    The biggest focus is going to be the switch current limit.

    Taking you input voltage compared to your output voltage lets assume a very conservatively low efficiency of 75%.

    That would give you a theoretical switch current of about 4.8A. With that in mind the TPS55332-Q1 should be capable of supporting that converter configuration with a proper selection of compensation values, input and output capacitors, inductor, rectifying diode, switching frequency, and soft-start.

    I would recommend working through the design calculations in Section 8.2 of the datasheet. Following these calculations step-by-step should give a design that will support your requirements.

  • 0 in reply to Ryan May
    Genius 4695 points

    Ryan-san,

    Thank you very much for your reply.

    I have a little unclear point so I will ask you additional questions.

    We calculated and tried in customer specifications to Power Stage Designer.
    (I am a bit worried about how to do it correctly)

    Can I judge that the specification can be satisfied from this result?

    ※Reasons to think like that:Internal Switch Current's peak is 5.7A (typ)

    Best Regards,

    Masumi Sekiguchi

  • 0 in reply to Pokkun
    TI__Genius 13700 points
    Hello,

    Based on your application and the fact that you are willing to operate with a 22uH inductor I would use the power stage design calculator and lower the switching frequency dow from 2.2Mhz down to the point where the recommended inductance value is right around 22uH.

    Based on the Power Stage Designer calculations and the quick calculations I performed in my post above the TPS55332-Q1 should be able ot handle these specs.

    Let me know if there are any other questions.
  • 0 in reply to Ryan May
    Genius 4695 points
    Ryan-san.

    Thank you for your answer.

    Let me confirm,please.
    That is if "L: 22 uH / Fsw: 2.2 MHz", is it usable in customer's specifications?

    Best Regards,
    Masumi Sekiguchi
  • 0 in reply to Pokkun
    TI__Genius 13700 points
    Hello,

    I would recommend looking at using a lower switching frequency.

    Lowering the switching frequency will help improve the efficiency and ensure that the circuit stays below the switch current limit and does not get too hot.

    That said the switching frequency is set with a single external resistor so if you design for 2.2Mhz and it is decided that a lower switching frequency would be better it is a relatively simple change.
  • 0 in reply to Ryan May
    Genius 4695 points
    Hello,

    What is the recommended target frequency in the specification below?

    ＜Specification＞
    VIN：28V
    VOUT：50V
    IOUT：2A
  • 0 in reply to Pokkun
    TI__Genius 13700 points

    Hello,

    Using the inductor value that you had given above of 22uH using the Power Stage Designer tool I would recommend starting with about 600Khz.

    That said these tools provide guidelines for expediting designs. The physical implementation will require fine tuning. They always do.

  • 0 in reply to Ryan May
    Genius 4695 points
    Ryan-san.

    Thank you very much for your answer.
    We will hear frequency because my customer uses for communication equipment.
    I would like to propose a frequency close to the target value as much as possible.

    Masumi Sekiguchi
  • 0 in reply to Pokkun
    Prodigy 140 points

    Hi

    I am using TP55332 IC for one of my application. The DC-DC converter is designed to operate as BOOST converter which provides 18.5V regulated output voltage from the input voltage range of 8V to 18V.

    I want to know to compensation circuit values, so that with proper layout and correct compensation values, stability will not get affected.

    Details of my circuit:

    The operating frequency of my DC-DC converter is 350kHz,

    output voltage is 18.5V,

    Chosen Inductor is 22uH power inductor

    and output capacitance  of 4.7uF x 3 ceramic capacitors,

    Input Capacitor is 4.7uF x 2 ceramic capacitors.

    So, what should be the compensation values of Resistor and capacitor, so that the circuit will be stable?

    I tried calculating from the datasheet, but unable to do it. Can you tell us how to calculate the values?

    Also, I see the switching power losses in this switching regulator is very high, can any adjustments made so as to reduce the switching losses?

    And for the EMI filter calculations of boost converter, can we use the Application note "AN-2162 Simple Success With Conducted EMI From DC-DC Converters" of Texas Instruments? Kindly suggest.

    Thanks and Regards

    Pratima V.

  • 0 in reply to Pratima Vishwakarma
    Genius 4695 points

    Hi, Pratima V-san.

    I'm Masumi Sekiguchi from Marubun co.

    (I'm TI's agency person.)

    This thread posted questions about TP55332 from you,

    It is within the thread I posted in the past.

    Perhaps, there is a possibility that you can not receive a reply from TI in the way of this posting.

    So, we recommend that you reconfigure another thread (keep an eye out for cases where you can not receive an answer).

    Best regards.