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  • Forum Post: Re: TPS54226 Eff

    JohnTucker
    I pulled the data from galileo. Definitely 12 V input.
    on Feb 3, 2010

  • Forum Post: Re: Problem with TPS61085

    Brigitte
    Hello Mr. Patel, TPS61085 is a boost converter which generates a higher output voltage than the supplied input voltage. The output power is always lower than the available input power (efficiency is always below 100%). You have a source that delivers 25mW and you want to supply a load of 2.5W which...
    on Feb 22, 2010

  • Forum Post: how to boost from 3V to 12 V?

    sami mkeche5
    Hi, Is it possible, to boost voltage from 3V to 12V. I will use duty cycle aqual to 0.75. So how I can choose the value of the inductor and the PWM frequency. Also is there an TI component that i can choose?
    on Feb 22, 2010

  • Forum Post: what's better to work in continue conduction mode or in discontinue conduction mode?

    sami mkeche5
    Hi, Concerned boost converter, what's better to work in continue conduction mode or in discontinue conduction mode? What are the advantges and disadvantages of each one the these two conduction modes? Thanks.
    on Feb 22, 2010

  • Wiki Page: TPS62200 Efficiency Lower Than Expected

    Michael Day
    Q: TPS62200 Efficiency Lower Than Expected by 713817 We are looking at using a TPS62202 and are testing a TPS62200 EVM. The measured efficiencies less than expected from the datasheet. We are expecting ~93% efficiency from the data sheet but measuring ~89% efficiency on the EVM (VIN = 3.3V, Vout ...
    on May 6, 2010

  • Forum Post: Re: Help - TPS5430 / TPS54331

    Chris Glaser
    For a 12V input, the TPS54620 gives the best efficiency. Parts with synchronous rectification give better efficiency in your application. From figure 52 in its datasheet, you can achieve 95% efficiency at 3A. The TPS54331 is a newer part with a lower Rdson FET. This should give better efficiency....
    on Aug 18, 2010

  • Forum Post: Re: TPS40061 above 10A (input 20V-50V, output 5V)

    Peter Miller13277
    Sal, Why the web site put 10A for the part and no mention in the datasheet. The Website offers recommended applications where the IC can be used, but it has some limitations. To help our customers, TI recommends a range where we believe the device will provide good performance with a reasonable...
    on Dec 16, 2010

  • Forum Post: Re: TPS63030 (Vout = 3.0V) : Input current drawn from the supply voltage source

    Chris Glaser
    Your schematic looks good. I do not have any data on lower output current efficiencies. The best way is to measure it under your conditions, with this app note as a guide: http://focus.ti.com/lit/an/slva236/slva236.pdf The efficiency measured or shown by the graphs is the total efficiency of the...
    on Dec 22, 2010

  • Forum Post: TPS63020 for constant current LED Driving

    Vladimir Demikh
    Hi, We designed a constant current circuit using the TPS63020. Efficiency is our peimary goal. We used an "active feedback" amplifier. We have two questions: 1) Is the attached design ok? Please see drawing. 2) When voltage goes down from 5v to 3v and then back up to 5v the input current...
    on Dec 26, 2010

  • Wiki Page: TPS54383 / TPS54386 Efficiency

    Chris Glaser
    Q: TPS54383 / TPS54386 Efficiency by 1102749 I believe there's an error in the datasheet for the TPS54383/6... on page 43, the efficiency plot for Vin=24V shows Vout=5V is more efficient than Vout=12V. Could you please confirm that these two data curves are mislabeled? (I imagine it should be...
    on Feb 14, 2011

  • Forum Post: Re: TPS43000 Asynchronous

    Peter Miller13277
    Tia, Do you realize your user name is Craig? Back to your questions. I presume when you say Asynchronous, you're refering to Non-Synchronous (1 MOSFET + 1 Diode) rather than Synchronous (2 MOSFETs) The efficiency benefit moving from Non-Synchronous (Diode rectifier) to Synchronous...
    on Mar 29, 2011

  • Forum Post: Supercap on TPS54260 Output - Best Efficiency

    Chris R
    I'm trying to build as energy efficient a system as possible--for 12 to ~30V source voltage operation. I'd like to be able to use a supercap to provide a voltage for a time after power is lost... Is it reasonable to use a supercap (say, for example, .25F) directly on the output rail of the...
    on Apr 27, 2011

  • Wiki Page: TPS62060 inductor selection

    Chris Glaser
    Q: My customer is trying to optimize the inductor in his TPS62060 application. The inductor recommended is too big. Application spec: Vin 3.135V to 3.465V, Vout=3.0V, Iout = 400mA. As per equation 2, if I use a 1uH inductor, IL comes to 475mA around? Can I use PLF1610-102ME inductor from...
    on May 6, 2011

  • Forum Post: MC33063A - Efficiency at light loads

    Stefano Infante
    Hi all! I was looking for a cheap switching regulator, capable of powering a light load (30 mA max) at 15 V, with 18-36 V input. I found this MC33063A, but all information I can get on the data sheet are about efficiencies at heavy loads (500 mA or so). I am strictly limited in the available power...
    on May 26, 2011

  • Forum Post: Re: TPS63020

    Daniel Acevedo
    If you connect PS/SYNC low, the TPS63020 will automatically transition between power save mode and PWM mode as the load varies. In your case, where the load is always greater than 100 mA, the TPS63020 will not enter power save mode; however, at 100-200 mA loads the efficiency of PWM mode is still...
    on Jun 23, 2011

  • Wiki Page: TPS63010 Efficiency Graph

    Daniel Acevedo
    Q: Requests the Efficiency Graph of TPS63010 by 1684384 Customer requested the efficiency graph of TPS63010 that X-axis is current, Y-axis is efficiency when VIN=4.0V and VOUT=3.3V. There is similar graph in the datasheet, but not same condition ( VIN=4.0V and VOUT=3.3V). Could you send me...
    on Jul 21, 2011

  • Forum Post: TPS62200 LED Driver

    Juval Izhaki
    Hi I would like to use the TPS62200 sync buck regulator as a low current LED (the LED only consume 4v@20mA from a 6V battery source) driver in a current feedback form. My question is as follow : 1. Can the TPS62200 be used as a led driver? 2. Can I dim the LED by PWM modulating the EN input...
    on Aug 4, 2011

  • Forum Post: Data of TPS61221/TPS61097 data sheet graphs for black box/behavioral modeling

    Mustafa Ali
    Hi, I am hoping that TI employees may be able to help me with this request. I am doing behavioral modeling (not SPICE models) of power supply subsystem for photovoltaic energy harvesting powered wireless sensors. As part of the full system model, I want to model the power transfer of characteristics...
    on Sep 27, 2011

  • Forum Post: Coin Cell Power for MSP430

    Charles Gervasi
    I have a board with an MSP430 and some LEDs. The voltage is 2.5V-3.0V. Peak current will be a max of 50mA for 50ms supplied by a supper cap. Ave current will be less b/c everything will sleep most of the time. I'm running the board with a Li coin cell. I'm trying to decide whether to use a boost...
    on Nov 17, 2011

  • Forum Post: NON ISOLATED BOOST CONVERTER

    John Wiemeyer
    Support, I am working with a customer on a new boost convert design with the following specifications: Vin: 3.0V to 3.6V, Vout: 12V and Iout: 30mA to 50mA. Price and efficiency are important to the customer. They want low cost and efficiency of better than 90% . I originally recommended an LM64010x...
    on Jan 6, 2012

  • Forum Post: App. note SLUP206 - Efficiency calculation of a synchronous buck

    Mohammed Rahim
    Hello team, Customer is referring to slup206 to calculate the switching power loss of a buck converter, but can't duplicate the results given in the appnote. In Table 2 on page 16, the switching loss of a switch MOSFET is given (e.g. 0.364W for the Si4836DY MOSFET). But using the equation for...
    on Jan 28, 2012

  • Forum Post: Re: TPS63020 light load efficiecy when Vin is closed to Vo

    Nick Tseng
    Evan, The TPS63020’s internal switches and processes required to regulate an output voltage consume power. Even at no load conditions, the part draws current to power itself. You can think of this behavior as the parts idle speed. Compared to a full load condition, the idle power consumption...
    on Feb 14, 2012

  • Forum Post: Re: TPS62170 - Power Consumption data

    Chris Glaser
    The efficiency graphs in the datasheet provide this information. Simply divide the output power (Vout * Iout) by the efficiency at that operating point and then subtract the output power. The result is the power loss.
    on Mar 13, 2012

  • Forum Post: TPS63030 Ripple in PS Mode

    Charles Gervasi
    How much ripple should I expect in PS mode? In the thread at this link , a user says the datasheet shows 100mV ripple in PS mode. I do not see this in the datasheet. I am seeing 100mV. I have been experimenting with my board. When I had 10uF output capacitance, I saw 200mV ripple. Going to 100uF...
    on Mar 23, 2012

  • Forum Post: Re: TPS63030 Ripple in PS Mode

    Charles Gervasi
    I have done testing on a board with only the power supply on it. Here is what I found: Quiescent current is in the 40uA range, and that appears to be the only overhead when little or no load is present at the output. Ripple = 150mV regardless of load ( < 100uA tested). Rise time is 4us regardless...
    on Mar 23, 2012
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