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TLV62568: Design feasibility

SWAROOP R SADARJOSHI
Intellectual 725 points
Part Number: TLV62568
Other Parts Discussed in Thread: TPS61089,

Hello,

I have a Li-ion 18650 cell battery pack of 1s5p configuration. I am employing a Boost converter (TPS61089) to obtain Vout=5V @Iload=2A.

I am supplying three loads with the boost converter output. on of them is a step-down converter TLV62568 taking input supply from TPS61089 and

giving an output of Vout=3.3V @Iload=1A, I am powering a MPS432P401 with the output of buck converter. This is the block diagram;

 

My questions are;

Q1. Will I encounter any noise in the supply given to MSP432 by TLV62568? If yes then what type of precaution I need to consider?

Q2. Does the noise from a converter affect the normal operation of MSP432?

Q3. Will the output of TPS61089 be noise free? If not what precautions I need to consider?

Q4. Is there a possibility of noise entry from boost converter TPS61089? Any specific measures that I need to consider?

Thanks and regards

Swaroop

  • 0
    TI__Expert 3465 points
    Hello Swaroop,

    it's a pleasure to support you.

    Q1. Please, define what is noise for you.
    Anytime you chose a switching mode power supply (SMPS) you are dealing with a highly nonlinear circuit which transfer energy from the source to the load by partitioning in the time domain this energy transfer (switching regime) and releasing/storing this energy in an appropriate way. This means:

    1) the output voltage will always present a ripple at the switching frequency
    2) there are pulsing currents going on in certain points of the circuit, hence of the PCB, and these could radiate if traces act like efficient antennas

    Here you can find some useful literature about SMPSs:
    -Switching Regulator Fundamentals www.ti.com/.../snva559a.pdf
    -Buck converter basic design equetions www.ti.com/.../slva477b.pdf
    -PCB layout tips www.ti.com/.../slyt614.pdf

    In general, our device's datasheet and product pages are plenty of support technical documentation to guide our customer's in their design. By following, for example, the Layout recommendation in the product's datasheet, you can have a valid starting point to reduce radiated noise, while there are indications on the same datasheet on which combination of inductor and output capacitor combination to chose to get a good working operation

    Q2. To answer this question you should post a dedicated thread mentioning the MSP432 partnumber, since for every product there is a dedicated support team.

    Q3. You can refer to Q1

    Q4. what do you mean by noise entry ?