• State Resolved
  • Locked Locked
  • Replies 9 replies
  • Subscribers 63 subscribers
  • Views 897 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.

Original question:

MC34063A: I am planning to use it as negative input voltage of -11 to a positive output voltage of 5v

MC34063A: Design Split Rail +-12V for HeadPhone Application, AC powered and or battery 9V.

Neil Henry
Intellectual 965 points
Part Number: MC34063A
Other Parts Discussed in Thread: LME49720, OPA2134, LM4562, NE5532, RC4580, TPS61170

IC: MC34063A 

Input: 24V

Output: +-12V

Current: 200mA

Question: Kindly provide a reference design for the above application if possible!

This IC selected due to cost. Also don't want to use discrete components. 

Note Web Bench seems not working for this IC! Like to simulate in Web-Bench but not able to do this online.

Power source is Wall Wart, 24V.

Neil Henry

IRAD LLC

  • 0
    TI__Mastermind 46905 points
    Hi Neil,
    I want to double check about the requirement.
    1. there are two output rail, one is +12, and the other is -12v. both rail need 200mA output current.
    2. no require ground isolation.
  • 0 in reply to Jasper Li
    Intellectual 965 points

    Hi Jasper,

    Ground isolation is required. All option is in consideration. Cost is a driver though.

    The client wants to use Wall Mount AC adapter such as  WAU12-200.

    For the headphone amplifier, the design team selected the TI LM4562 and or LME49720, or the OPA2134.

    For me the NE5532 and RC4580, with load 600OHM should be adequate. So we are looking at all options.

    Since noise is an issue, ground isolation key to the design, the main driver.

    Thank You,

    Neil Henry

    IRAD LLC

  • 0 in reply to Neil Henry
    TI__Mastermind 46905 points
    Hi Neil,
    there seem be two inputs, one is from 120VAC line, one is from 9V battery. and the headphone need +-12V DC for the amplifier.
    1. I would suggest select AC-DC adapter instead of AC-AC, such as SWI5-12-N-P5, lower cost and higher output power.
    2. from the 12V adapter or the 9V battery, we can use TPS61170 to generate +-14V for the amplifier. the boost converter can generate 14V and adding two diodes and one cap to generate the negative 14V.
  • 0 in reply to Jasper Li
    Intellectual 965 points
    Hi Jasper,

    Thank you. We will go with the part number, SWI5-12-N-P5 for the AC-DC adapter.

    However, to generate +-14V for the amplifier, the.... converter generate 14V and adding two diodes and one cap to generate the negative 14V, we need a PDIP(8) package.

    Kindly suggest an IC PDIP(8) package besides MC34063A if not meeting the +-14V requirements.

    Regards,

    Neil Henry
  • 0 in reply to Neil Henry
    Intellectual 965 points

    Hello Jasper,

    I found this reference design PMP7006 for the IC MC34063A.

    I would like to modify it for our objective, plus and minus 12V. Client will delete the 9V battery requirements.

    Can you recommend a viable T1 for this design, since the WE 760370102 not on market. Looking for an alternative part number.

    Thank you.

    Neil

  • 0 in reply to Neil Henry
    TI__Mastermind 46905 points
    Hi Neil,
    the reference design can only support 20mA that doesn't meet you requirement. I need to research if there is other better solution. will reply you next week.
  • 0 in reply to Jasper Li
    TI__Mastermind 46905 points
    Hi Neil,
    I think we can use two MC34063A, one with boost structure to generate +14V. the other with buck-boost structure to generate -14V.
    I want to avoid using transformer, which is high cost and not easy to find in the market.
  • 0 in reply to Jasper Li
    Intellectual 965 points

    Hi Jasper,

    Thank you!

    Working on the schematic for the above design for the IC MC34063A. We like this approach.

    Keep you posted.

    Neil

    Working on the schematic for the above design for the IC MC34063A.

  • 0 in reply to Neil Henry
    TI__Mastermind 46905 points
    Hi Neil,
    OK. I closed this post. if there is further question, just reply below. or generate related post if this one is lock.