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Related Posts

  • Forum Post: TPS40090 / TPS40090EVM-002 Vout > 1.5

    John McCarthy13665
    I recieved the TPS40090EVM-002 evaluation board with the TPS40090 high frequency controller. My question is, how do I increase the output voltage. The documenation states .7vdc-6vdc, but for the life of me I can figure out how to control it. The issue is one piece of documentation states it is...
    on Jul 24, 2009

  • Forum Post: TPS62050 Step-Down, Vin vs. Vo

    Steve P. (NY)
    Looking for clarification on subject '800mA Synchronus Step-down Converter'. I'm assuming, given that this is a switching DC/DC regulator, that (generally) the input voltage can fall below the output voltage; this would not be the case with a linear regulator. Sh.3 of the data sheet...
    on May 3, 2010

  • Forum Post: TPS63020 operation at low Vin

    Greg Dettro
    We have a customer who wants to design with the TPS63020 with the following requirements: Vin 1.8V to 5.0V Vout 1.2V Iout required: 6mA to 800mA Iout desired “headroom” up to 1.6A (2 times their typical Iout required) With the possible low Vin of 1.8V, SwitcherPro will not...
    on May 25, 2010

  • Forum Post: Apparent TPS 40200 design mistake. HELP

    Ivan Perino
    Hello Specialists.. I've designed a switching power supply using the TPS40200 controller. I made it using the SwitcherPro tool offered in TI Website. If you try a design with the followings parameters, TPS40200 V input min : 12V V input max : 48V V output : 5V I output max...
    on Jul 29, 2010

  • Forum Post: TPS54231 Power Handling Capability

    J D
    Dear All, I wish to use TPS54231(Buck converter) to charge a 6V/10Ah battery in one of my applications.The data sheet says it has a output current capability of 2A .So does it have an internal current limit circuitry that would protect it from over supplying a current beyond safe limits to say a fully...
    on Sep 17, 2010

  • Forum Post: External Current-Boost for MC33063 buck converter

    Renjith Narayanan
    Hi For my project i want to use a dc-dc converter input 24V Output 5V,1.5A I am using MC33063 with external current boost transistor (npn), is anybody worked in this circuit Also please share the critical points to be taken care Any answer in this will be appreciated With Best...
    on Apr 28, 2011

  • Forum Post: MC34063 (MC33063) Timing Capacitor

    Jim Gavin
    Is there a limit to the charge/discharge rate of the timing capacitor? I have calculated a Ton of 2.66us and a Toff of 7.56us for my application. This gives a timing capacitor value of about 47pF (in application), which results in a Tchg of about 2.6us and a Tdschg of about 400ns resulting in a frequency...
    on May 10, 2011

  • Forum Post: tps54160 wrong output

    Rokos
    Hallo, i use the tps54160 for my application, the requirements are: input 47-49V and output that i want 42V. i used the SwitcherPRO Design Tool (Please visit the site to view this file) in order to designt my converter. However i take 4,9 volt on the output (without load). Some measures on the...
    on Jun 1, 2011

  • Forum Post: tps54060 PWRGD over the absolute max ratings

    Rokos
    Hallo, i use for a battery application the tps54060, the input is aprox 40V and the output taken 10V. However, i measure on the PWRGD pin the value that i have on the output. In this point i have to inform you that i do not have any osci. If someone have some idea what i make wrong , i would be...
    on Jun 6, 2011

  • Forum Post: Re: TPS54620 not stable with different load conditions.

    Nick McMilan
    Hi John, The requirements of my design does not allow me to change components. Can you please recommend one set of compensation values for my 6 conditions? Vout 2V and 5V, at Iout of 0A, 2A and 6A. When using Switcher Pro, it recommends 6 different set of compensation. When I try 2v or 5V...
    on Jun 10, 2011

  • Forum Post: P-channel MOSFET integrated in tps62590

    Ken Zhang
    Hi tps62590 can be 100% duty conducted and boostrap cap.is not needed.is there P-channel MOSFET integrated in tps62590? but in "functional block diagram" at 4 page of datasheet, the N-channel mosfet is drawn. is this a mistake?
    on Jun 20, 2011

  • Forum Post: TPS82671 1.80 V at 600 mA DC to DC Converter Module - use as a constant current source ?

    Stephen Salgaller60015
    I want to use the TI TPS82671 1.80 V out at 600 mA module as a 350 mA current source to supply a high power LED; can't i just add a resistor to make the device supply the needed current, or is there some way to set the module to be a current source as is ?
    on Jun 24, 2011

  • Forum Post: Re: AC/DC

    eli
    We saw the TPS64203,but customer is looking for simple solution as possible.
    on Jul 12, 2011

  • Forum Post: Re: Help on buck converter

    Brigitte
    Hello Matheus, A NMOS transistor needs higher voltage on the gate to turn it on. You will not be able to turn the NMOS on with 5V. How about replacing the NMOS with a PMOS? The PMOS is turned on when the gate is lower than the source and therefore this should work with your available 5V. You just...
    on Jul 20, 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: Problem with TPS51315 frequency/output

    Nick Black
    I am using the TPS51315 using the schematic above and have some problems with a reliable output. I started out by depopulating R7 and R8 and using a 5k pot at J9. If I have the wiper all the way to one side where R7 becomes ~0Ohm, it outputs ~0.75V correctly, and then as I turn the pot I can get the...
    on Sep 9, 2011

  • Forum Post: Looking for a low speed PWM Controller

    Alexandre Marquis
    Hi, I need a 30V ,30A, 400Hz PWM output power stage near 100% PWM. I'm looking for a PWM controller with a frequency of 400Hz. What I need is a low frequency current mode controller to drive my high side switch, to be able to protect my Hi-side Mos in case of short at the input. I'm...
    on Sep 13, 2011

  • Forum Post: using TPS40170 to generate a negative 15 v

    noura zogheb
    Hi, i am really confused here. For sometime, i was thinking using TPS54260 as an inverting buck boost and now, i found out that the output current is not the rated current of the TPS542560 (2.5Amps) . the real output of the device is decreased by (1-Duty cycle). Can i use "TPS40170 "...
    on Sep 15, 2011

  • Forum Post: How to reduce Turn on time of TPS54620 buck regulator

    Mahesh Hooli
    Hi All, I am seeing 10mSec of turn on time [input to output]on TPS54620 buck regulator. Input is 5V and it the regulated output is 4.1V. Could you please suggest how to reduce the turn on time of the regulator? The slow start is designed for 1.7mS. Please refer the below circuit diagram of...
    on Sep 21, 2011

  • Forum Post: Re: How to reduce Turn on time of TPS54620 buck regulator

    Mahesh Hooli
    Dear John, Thank you for the reply. I found that, it is not regulator some other (FETs) which were causing the delay. Please find the input /output waveform below,[Channel 1 is 5V input ;; Channel 2 is 4.1V output] Actually the 4.1V Li-Ion battery & Output of Buck regulator is connected...
    on Sep 23, 2011

  • Forum Post: Re: How to reduce Turn on time of TPS54620 buck regulator

    Mahesh Hooli
    Please find the schematics of the power section below, I have removed the U17 to avoid the delay. Here is the modifications done, R125 118K R117 200K R171 2.15K R170 4.7K , 1nF on C193 & C194. and 0.1uF cap parallel to R170,R161. U17 is removed. Charger is directly connected to U48.5
    on Sep 23, 2011

  • Forum Post: Re: How to reduce Turn on time of TPS54620 buck regulator

    Mahesh Hooli
    As mentioned in above post, The power to he system is ORed between Battery and the regulator, There is no issue when Battery is present and regulator is turned ON. In this case if I turn off the regulator , I am seeing a voltage dip of 0.4V on the VBAT line. This is causing a reboot when battery...
    on Sep 25, 2011

  • Forum Post: TPS40200 Sensitivity

    123
    Hi, Would like to seek for advise on the sensitivity of the VDD and Isense pin of TPS40200. Tried to use the probe to Isense pin and the TPS40200 just reset. Another test done is the ESD test. Kindly refer as below, Channel 1 as VDD, Channel 2 as Isense. At this transient of ESD, the 3.3Vo dipped...
    on Sep 29, 2011

  • Forum Post: TPS54610

    James Fuerherm
    I am using two of the TPS54610's in an application but discovered I need to have ratiometric tracking during startup for these two voltages. I am using the preset internal soft-start time; aka no external capacitor. Can this be done as simply as tying the two SS/ENA pins together? Would I need an...
    on Sep 30, 2011

  • 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
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