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tps54620
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  • Forum Post: Type III Compensation for TPS54620

    Cliff Vrla
    From my customer: Do you have a bode plot application for the TPS54620? I have used the SwitcherPRO stuff from TI but it only performs type 1 and TYPE 2 compensation which makes the bandwidth extremely low. The TYPE III compensation according to the application note appears to be better but there...
    on Jan 7, 2010

  • Forum Post: Re: Type III Compensation for TPS54620

    JohnTucker
    No, there is currently no support for that. There may be a Mathcad file for internal use. Sometime soon switcherpro will support this.
    on Jan 8, 2010

  • Forum Post: Re: TPS54620 Reference Tolerance

    JohnTucker
    I beleive the refernce is measured / characterized by tying VSENSE to COMP so that the output at COMP is equal to the internal reference. That voltage is characterized over temerature and operaing parameters as specified in the datasheet. So the 1% include the reference itself and any offsets associated...
    on Jan 13, 2010

  • Forum Post: TPS54620 - will it track during shutdown?

    Allen Wachter
    Does the TPS54620 track the voltage on the SS/TR during a power down? Assume that Vin is present and the device is active as the voltage on SS/TR is pulled low. Thanks!
    on Jan 22, 2010

  • Forum Post: Re: TPS54620 - will it track during shutdown?

    JohnTucker
    The TPS54620 has 2 non inverting inputs to the error amplifier; VREF and SS/TR. It will use the lower of those two voltages. So if teh device is regulating and SS/TR is pulled below VREF, the ouptu will track the SS/TR voltage.
    on Jan 25, 2010

  • Forum Post: Re: TPS54620 SS/TR Pin: max voltage and relationship to Vref

    JohnTucker
    After the SS/TR voltage has reached steady state, the input is pulled up to an internal rail. That rail is 1 VT below 2.5 or approximately 1.8 V. The variaence will be on the particular VT drop. I do not beleive this is a characterized parameter so I cannot provide any specific voltage variation. The...
    on Jan 28, 2010

  • Wiki Page: TPS54620 VIN input current

    Michael Day
    Q: TPS54620 VIN input current by 1099971 Hi Team, In the datasheet the Vin current is specified to: VIN shutdown supply current: 2-5uA VIN operating – non switching supply current: 600-800uA The customer want to know VIN operation - switching supply current? VIN and VINP will be sourced...
    on Mar 9, 2010

  • Forum Post: Re: TPS54620 - will it track during shutdown?

    casc
    John, there are concerns of my customer regarding the tracking behaviour. Will the output track down to 0V, or is the behaviour the same like TPS40140, where the IC switches off, if the voltage at TRK drops below 0.5V? Are there other conditions tht may prevent from complete tracking (fault conditions...
    on Jun 30, 2010

  • Forum Post: Re: TPS54620 - will it track during shutdown?

    JohnTucker
    I f you look at figure 48 in teh data sheet you will see the tracking relationship. The track in to Vsense relationship is linear above trackin voltages of 30 mV. For track in voltages below 30 mV, the IC is still operational, but teh trackin voltage is less that the offst voltage so teh output is near...
    on Jun 30, 2010

  • Forum Post: TPS54620: Cannot set Vout under 6 volts

    Abel Mendes
    Mates, I'm getting in trouble with TPS54620, because it's getting impossible to regulate the Vout under 6 volts. I followed the schematic of figure 34 from the datasheet, with the required changes to meet the next requirements: Vin=15V; 2V<Vout<15V; Iout=4A. But, no matter what...
    on Jul 12, 2010

  • Forum Post: Re: TPS54620: Cannot set Vout under 6 volts

    Chris Glaser
    The TPS54620 can regulate to as low as 0.8V. What resistor values have you installed for R5 and R6? Are you doing this testing on the EVM or is this your own board? Your CH3 waveform doesn't look right. The mean value is 8.45V, while it should be regulating to 0.8V. Please make sure that CH3 is...
    on Jul 12, 2010

  • Forum Post: Re: TPS54620: Cannot set Vout under 6 volts

    JohnTucker
    Yes, if teh circuit is properly built, the resistor divider from Vout to V_SNS to ground (R5 and R6 in this example) is all that is required to set the output voltage. Pin 7 should always be .8 V. With R5 and R6 as shown, the output should be 3.3 V.
    on Jul 12, 2010

  • Wiki Page: TPS54620 Enable pin absolute maximum value

    Michael Day
    Q: TPS54620 Enable pin absolute maximum value by 605762 HI, My customer has produced a TPS54620 data sheet that lists the abs max voltage on the enable pin as 3.0V. The version I down loaded from TI.com shows this value at 6.0V. I tend to believe the version on TI.com, but I am seeking confirmation...
    on Jul 12, 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: TPS54231 Power Handling Capability

    Chris Glaser
    The TPS54231 does have an internal current limit that will limit the peak current to 3.5A typical. This value is the load current plus 1/2 of the inductor current ripple. At the high duty cycle, going from 8V to 7V, the IC will get very hot. If you only need 8V in, please look at the TPS54620, which...
    on Sep 17, 2010

  • Forum Post: Switching regulator VSENSE Connection- TPS54620

    Pratheesh Babu
    Hello, I am filtering the output of TPS54620 (for my 12V to 3.3V design) using a common mode choke. So now there is an interesting question as to where I need to connect VSENSE pin to? Is it to be connected before the choke or after the choke. Is it going to make any difference. The scheme is shown...
    on Nov 11, 2010

  • Forum Post: Re: Switching regulator VSENSE Connection- TPS54620

    JohnTucker
    You do not show all the other components, but I recommend that you connect the voltage setpoint divider to VSENSe after teh output inductor and before the common mode choke. Connecting after teh common mode filter would nominally give better regulation, but will make stabilizing the control loop difficult...
    on Nov 11, 2010

  • Forum Post: Re: Switching regulator VSENSE Connection- TPS54620

    JohnTucker
    I recommend that you do not connect to the filtered ground. I connect the sensitive analog returns with a small copper pour area or 20-30 mil etch line. Then connect them back to the main power ground copper pour area at a single point close to teh IC. Due to the pinout of the device, you will need to...
    on Nov 12, 2010

  • Forum Post: Re: Sudden TI 54620 failures in prototype assemblies - need help!!

    JohnTucker
    If you are exceeding the abs max on the EN pin, then you may be introducing some latent failure mechanism. These are sometimes unpredictable. You will need to tell me more about your failure conditions. You state the regulator powers up, then runs for a long time before the failure occurs. what is the...
    on Feb 1, 2011

  • Forum Post: Re: Power Management IC suggestions Required (3.3V @ 6 amp, 2.5V @ 0.3 amp and 1.2 V @ 3 amp)

    Chris Glaser
    At power.ti.com you can do a power quick search and find devices that meet your needs. You didn't mention an input voltage, but the TPS54620 is an integrated 6A device that will likely work for you. It has a PG, EN, and SS pin for easy sequencing, tracking, etc that is often required for processors...
    on Feb 23, 2011

  • Wiki Page: TPS54320 SS/TR and Power Good Relationship

    Chris Glaser
    Q: TPS54320 SS/TR and Power Good Relationship by 1012266 A customer is having an issue with the tracking function of the TPS54320. Specifically, he has run through the equations in the datasheet for the resistor divider R1 and R2 on page 16 for simultaneous sequencing. The calculated results give...
    on Apr 14, 2011

  • Forum Post: Re: what is the difference between package code RGY and RHL?

    JohnTucker
    There is no difference between the 'custom' RGY leadframe of the TPS54620 and the RHL. The 'standard' RGY package does not have the 'wings' you see in teh outline drawings.
    on Apr 20, 2011

  • Forum Post: Re: Parallel multiple TPS54260 output

    JohnTucker
    In general you can parallel devices that use current mode control. I have done this with the TPS54620 successfully (2 x 6 A = 12 A total). If you look in the product folder you will find documentation on this. I am not sure about putting more than 2 circuits in parallel. The layout is a little tricky...
    on May 3, 2011

  • Forum Post: TPS54320 SYNC Question

    James Fuerherm
    I am planning on using 3 TPS54320's all sync'd to a 500kHz system clock. The pulse width of this clock is 250ns. The datasheet states that the minimum required sync pulse width is 20ns (on page 4 of the datasheet). Meanwhile, in the application notes, it states that the pulse width should be...
    on May 25, 2011

  • Forum Post: Re: TPS54620 6A LED drive OSCILLATES at no load

    JohnTucker
    Switcherpro will only calculate compensation for voltage source buck converter. I don't know how you are configuring your circuit, but if you are driving LEDs, you should never have a "no load condition". can you post your schematic and waveforms that illustrate your concerns?
    on Jun 4, 2011
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