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Thread: 12V 4.16amps

  1. #11
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    Ummm. It's an ISR. Integrated Switching Regulator.

    http://www-s.ti.com/sc/ds/pt6656.pdf


    Doesn't "switching regulator" mean it will step up or down as needed?

  2. #12
    Raw Wave Rob Withey's Avatar
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    Nope, read the spec sheet again. In particular, may I refer you to the specs on the Input Voltage Range where it says that the minimum is Vo+3. Ie, you need 3V of headroom on the regulator.


    Rob
    Old Systems retired due to new car
    New system at design/prototype stage on BeagleBoard.

  3. #13
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  4. #14
    Maximum Bitrate eugenen's Avatar
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    Originally posted by Pred8tr
    Ummm. It's an ISR. Integrated Switching Regulator.

    http://www-s.ti.com/sc/ds/pt6656.pdf


    Doesn't "switching regulator" mean it will step up or down as needed?
    Nope

    A switching regualtor can be just step down, or just step up, or both. The 6656 is a step down, a PT4051 for example is a atep up. Switching basically means just that switching. It has some sort of oscolator that pulses a switching transsitor to switch the input on and off fasy at the percentage needed to create the output. For step up they pulse the input through a coil to get a higher output. Look at the whole family chart http://focus.ti.com/docs/search/para...e&familyId=563 in the last colum at the description for step up/ step down/etc.

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