Power Management
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Startup
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  • Forum Post: TPS62220 Startup Time

    Cliff Vrla
    Greetings, The following questions are about the startup behavior of the TPS62220. The datasheet does not explain this very well. 1) What is the variation in startup time for the TPS62220? Is this characterized or tested? 2) HOW does startup depend on output capacitance and load current?...
    on Feb 10, 2010

  • Forum Post: Re: TPS62220 Startup Time

    Michael Day
    1. Startup is not characterized or tested. The steps are explained in the datasheet, but the stated current values are only typical and could have significant variation. Each softstart step lasts for 255 clock cycles. 2. A larger capacitance and load current could increase the softstart time if the...
    on Feb 10, 2010

  • Forum Post: Re: TPS61026 boot up problem

    Michael Day
    Can you confirm that the problem is startup related. Measure the inductor current on an oscilloscope. If the peak current is 40% of the nromal peak current (Isw Switch Current Limit), then it is a simple startup problem.
    on Apr 12, 2010

  • Wiki Page: TPS61026 boot up problem

    Michael Day
    Q: TPS61026 boot up problem by 1419131 (Please visit the site to view this file)HI I am using TPS61026, BQ24070 and BQ27501 to build my Battery management circuit. My AC-DC is 5V 2A, the battery is 3.7V Lithium Ion Battery 2250mAH. The input of TPS61026 is 4.4V and output is 5V. My load is an...
    on Apr 12, 2010

  • Forum Post: Re: TPS61026 boot up problem

    John Li47269
    Hi Jeff I tried power-on PM circuit and get 5V from VOUT of TPS61026 first and then plug in my load(CPU board end LCD). The VOUT becomes 1.8V too. On the LCD drive board, I found three inductors for boost up the voltage for the LCD back light. Maybe LCD drive board has big peak current? If so what...
    on Apr 13, 2010

  • Forum Post: Re: TPS61026 boot up problem

    John Li47269
    Hi Michael How can I catch the peak current by an oscilloscope. I got the voltage only. By put a 1 ohm load in series?
    on Apr 13, 2010

  • Forum Post: Re: Oscillator start up timing spec for external osc. feeding HFCLKIN on TPS65920

    Gandhar Dighe
    Hi Jeff, This requirement is necessary because OMAP may not function properly if the HFCLK is not provided before reset goes high. I have seen some customers adding delay on reset so the clock is stable before the reset signal goes high. Here is one oscillator with 3ms start-up time - SG-210 series...
    on May 20, 2010

  • Forum Post: TPS65920 minimum startup voltage in slave mode

    Philippe MAIRE
    Hi, I am operating a TPS65920 in slave mode. The datasheets says this about the input voltage: "However, the minimum voltage at which the device will power ON is 3.2 V ±100 mV (if PWRON does not have a switch and is connected to VBAT)" Well, what happens if the PWRON is digitally...
    on Jul 8, 2010

  • Forum Post: Re: TPS650732 PGOOD delays

    Michael Day
    Information written into the TPS650732 internal registers is erased when power is removed from VCC. This information must be rewritten at power up. The IC does not have non-volatile registers available for the customer.
    on Jul 23, 2010

  • Wiki Page: TPS61042 CONTROL PIN

    Michael Day
    Q: TPS61042 CONTROL PIN by 282015 On figure 12, page 8 of the data sheet, why does it take over 200 us delay after CTRL goes HIGH for the chip to start? A: Re: TPS61042 CONTROL PIN by 10449 The TPS61042 requires approximately 20us for the internal band gap to go into regulation and become stable...
    on Sep 15, 2010

  • Forum Post: Re: tps54325

    JohnTucker
    What is the reference designator of the AL 470 uF capacitor? Is it applied to the input or the output of the TPS54325? The TPS54325 is meant for use with ceramic or low ESR output capacitors. If it is on teh input supply, I have tested teh TPS54325 many times with large electrolytic input caps (keeping...
    on Oct 4, 2010

  • Wiki Page: TPS63030 Startup Enable Time Delay

    Michael Day
    Q: TPS63030 Startup Enable Time Delay by 12948 A: Re: RE: TPS63030 Startup Enable Time Delay by 1169162 The startup behavior shown in the scope plot is expected. The TPS63030 shows a delay between EN pin goes high and startup of the converter at - first startup - every startup when...
    on Oct 18, 2010

  • Forum Post: Re: TPS61200

    Michael Day
    Can you provide your schematic? It did not appear to be attached. Do you see the problem with a resistive load, or only with your system load? What is your system load, and can you provide a V-I curve for it at startup? Also, it is very helpful to add more description to the subjec line to give...
    on Dec 7, 2010

  • Forum Post: Re: questions about TPS65130

    Brigitte
    Hello David, It is possible that the IC is damaged due to the wrong settings. Please try to replace it with a new one. In addition, it is important that the feedback resistors and feedforward capacitors as well as the compensation components are near to the IC. Layout is an important task with regulators...
    on Dec 13, 2010

  • Wiki Page: TPS3808G01 MR: can it be asserted during power-up?

    Michael Day
    Q: TPS3808G01 MR: can it be asserted during power-up? by 15398 I just wanted to confirm that the TPS3808G01 power up and operate correctly if the MR input is asserted during its power up sequence? A: Re: TPS3808G01 MR: can it be asserted during power-up? by 10449 The TPS3808 will operate...
    on Feb 8, 2011

  • Wiki Page: TPS386000 power up

    Michael Day
    Q: TPS386000 power up by 471914 Team, one question regarding the power up / sequence of the TPS386000. As the datasheet does no show restrictions here i just want to make sure we have not overlooked something. It will have voltages conected via high impedance resistive dividers to some of the sensing...
    on Mar 8, 2011

  • Wiki Page: TPS3808 undefined output state

    Michael Day
    Q: TPS3808 undefined output state by 1682396 Dear all, I have a question about TPS3808's undifined output state. Datasheet says when Vd is under 0.8V, reset signal is undefined. Can i understand that reset signal can be both state high and low irrespective of Vsense signal? If so,...
    on Mar 17, 2011

  • Wiki Page: TPS65735/TPS65835 Boost Start-Up Issue

    Daniel Acevedo
    Q: TPS65735/TPS65835 Boost Start-Up Issue by 1129650 The boost converter on my TPS65835 (or TPS65735) EVM does not tun-on to the full output voltage of 10V. The output only powers up to about 8 volts; why is this? A: Re: TPS65735/TPS65835 Boost Start-Up Issue by 1129650 The TPS65735 and TPS65835...
    on Aug 5, 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: Re: TPS61085 - Boost + negative voltage source

    Brigitte
    Hello Laurent, In the above measurement, I interpret waveform 1 being SS pin, waveform 2 being the SW pin and waveform 3 being the output voltage of the negative charge pump. Pleaes correct me if I am wrong. For me this looks as if the input voltage crashes because of the current TPS61085 and the...
    on Oct 31, 2011

  • Wiki Page: TPS61090 start up issues

    Michael Day
    Q: TPS61090 start up issues by 741196 Team, Customer is using the TPS61090 to generate 5V to charge cell phones. One of the cell phones require 1A charging current. Once the TPS61090 is waking up to this load, obviously it enters to current limit and “stuck’ on 2.5V. ...
    on Nov 3, 2011

  • Forum Post: Re: TPS79918 ENABLE

    Darwin Fernandez
    Just to clarify, the device begins to start up when the enable reaches the minimum threshold VEN(HI) which is 1.2V. The device shuts down when the enable pin reaches as high as 0.4V. What is your input voltage? How is the NR pin terminated? There may be an issue with the RC (timing) circuit connecting...
    on Nov 3, 2011

  • Forum Post: Limiting inrush current in TPS61220 family

    Ryan Aylward
    I am testing a new design using the TPS61222 to generate 5V from a 2AA battery pack. The 5V rail is only required for a subsystem containing LEDs - the MCU runs directly off the battery. When the regulator is enabled in order to supply power to the 5V subsystem, an inrush current of up to 200mA is possible...
    on Nov 21, 2011

  • Forum Post: TPS5410 Startup problem

    Steve Scarlata
    Hi, I'm using a TPS5410 in my design to regulate to 17V from input voltage of 28V. Circuit is right from the data sheet, feeback resistor values 15K and 1.13K. Layout also very close to datasheet. Output filter cap is 100uF Panasonic EEE-HA1V101 I'm finding that sometimes I can get a...
    on Dec 9, 2011

  • Forum Post: TPS61220 for charging a battery from piezo electric source

    jairam surya
    I am working on piezoelctric energy harvesting, am using TPS61220 to provide constant DC supply to the battery. The output from the piezo transducer is given to bridge rectifier which is in turn given to dc-dc converter and to which a battery is connected. For testing the dc-dc converter am using TPS61220EVM...
    on Dec 27, 2011
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