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  • Forum Post: Re: TPS40193 - Active High Enable

    Peter Miller13277
    The TPS40192/3/5 enable pin is active high with an internal pull-up (1.5MOhm) to VDD. The EN pin has an internal clamp of approximately 2V when the IC is enabled and needs a minimum 1uA of current to remain active. The EN pin can be driven active-high with an external open-collector or open-drain...
    on Jun 22, 2010

  • Forum Post: Re: TPS40192 question for ENABLE function

    Peter Miller13277
    Brian, Forcing 18V on the EN pin from a low impedance source will likely result in damage to the IC. The latest version of the datasheet specifically covers this: The shift in voltage that you are seeing is likely a result of ground current. The Enable current generated by the 18V on EN...
    on Sep 7, 2010

  • Forum Post: Re: TPS54325

    JohnTucker
    I can tell you that the EN pin is active high. It must be pulled up to enable the device. I usually tie EN directly to Vin to enable. I may have some additional characteristic data fro the EN pin, but I do not hav access to it at this time. I am out of the office until Monday, so I may not reply further...
    on Dec 1, 2010

  • Forum Post: Re: TPS54325

    JohnTucker
    The device is OFF when EN is floating. If you are using that FET to pull EN up to 12 V, then that will work. At 12 V, the IC will draw 20 uA into the EN pin. you may want to use a resistor from drain to ground so that ther is enough current in teh FET.
    on Dec 1, 2010

  • Forum Post: Re: Using TPS54060 to generating inverting voltage but how to disable it??

    JohnTucker
    You will have to use a level shifter to control EN as the internal ground of the device is now at the negative output voltage and your EN control will have to be referenced to that voltage as well.
    on Dec 17, 2010

  • Forum Post: Re: TPS63031 Voltage difference between Power- and Control-Stage

    Michael Day
    The TPS63030 VIN and VINA pins can be shorted together externally. A better option is to allow VINA to be powered through VIN through the internal resistor designed to connect these two pins. You need an additional filter capacitor with this method. This provides a cleaner voltage rail to power the TPS63030...
    on Jan 24, 2011

  • Forum Post: Re: TPS54160 UVLO filtering

    JohnTucker
    I would suggest that it would be better to filter the input voltage to ground rather than couple the ac into EN. You will have the benefit of less noise on the VIN as well as cleaner EN. Alternately you could program the start voltage and enough hysteresis into the EN (Vstart -Vstop) so that EN is not...
    on Mar 3, 2011

  • Forum Post: Re: TPS54160 UVLO filtering

    Franco Zampicinini
    And why this r ecommendation is not present on the TPS54260, TPS54140 and TPS54240 datasheets? Is the EN internal circuit different? From the datasheets they seems identical, but only for the TPS54160 there is the note about the capacitor on the pin and the detailed description of the internal zener...
    on Mar 4, 2011

  • Forum Post: Re: TPS54160 UVLO filtering

    JohnTucker
    That is updated information. The other datasheets in that family will eventually be updated, but I do not have any schedule information regarding that.
    on Mar 4, 2011

  • Forum Post: Re: driving enable of TPS54160 in dual rail inverted configuration

    JohnTucker
    You will have to use a level shifter to drive the EN pin from logic that is referenced to ground. We may have an example circuit, I will post later.
    on Mar 15, 2011

  • Forum Post: Re: TPS54160 Hysteresis calculation

    JohnTucker
    Vena = 1.25 V not 3 V. I get R1 =23861 and R2 = 2163 not 9100. Try that and see if it works.
    on Mar 29, 2011

  • Forum Post: Re: Enable TPS5430

    JohnTucker
    Yes, you can pull it up to 3.3 V. Make sure not to exceed the absolute maximum rating for the EN pin
    on Sep 6, 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: TPS63030 Shunt Transition: What happens if V[out] > V[setpoint]?

    Charles Gervasi
    I am powering my board with a TPS63030 driven by a battery at its input. I want to be able to switch in a shunt. When I enable the shunt, I'll drive EN low to disable the TPS63030. This disconnects the output from the load. I don't know how fast, but I'm guessing I can switch in my shunt...
    on Jan 26, 2012

  • Forum Post: Re: driving enable of TPS54160 in dual rail inverted configuration

    JohnTucker
    The En pin is always relative to the ground of the IC not the ground of your circuit. At start up the IC ground is at 0 V. At the end of the slow start time the IC ground is at - vout. That is why you need to use the level shifter of the previous post....
    on Feb 2, 2012

  • Forum Post: Re: TPS5401 UVLO

    JohnTucker
    Yes. If EN is held low, the EN source current is typically close to 1.3 uA (it is spec'd at 0.9 uA at Vth - 50 mV). So the shutdown current is essentially, EN current plus leakagecurrents elsewhere.
    on Mar 20, 2012

  • Forum Post: TPS61222: Output voltage @ shutdown mode ?

    jun2
    Hello,i am working at a Wireless Sensor Network project about methane gas monitoring .I used a Catalytic gas sensor. To decrease the power consumption of the sensor,i want use a software controled PWM signal with 60% duty cycle to make the power (Vcc_sensor) on or off. The sensor is powered by TPS61222...
    on Apr 28, 2012

  • Forum Post: RE: TPS61200 not fully turning off

    Chris Glaser
    Could you look at the L pin to see if the IC still switches? If this pin simply shows your input voltage with no switching, then the IC is indeed off. Something else is causing the 2.5V to appear on the output (another power supply, leakage, etc.) Could you make sure and look at the EN pin with a scope...
    on Jul 18, 2012

  • Forum Post: RE: TPS60241 power On / Off cycling

    Chris Glaser
    The EN pin can be driven high and then low again as many times as you want.
    on Dec 13, 2012

  • Forum Post: RE: TPS63060 - Is there Pull Down resistor in the TPS63060 inside for EN pin?

    Chris Glaser
    No, there is no internal pull-down or pull-up, so this pin should not be left floating. This is done on the EVM: http://www.ti.com/tool/tps63060evm-619
    on Feb 7, 2013

  • Forum Post: TPS5450 instability & outright failure @ certain Vin voltages

    Grayson King
    I have the following TPS5450 circuit designed into a new product: Design is for Vout of 5.6V at up to 5A over a Vin range of 8V to 30V, and SwitcherPro says it'll work fine. I've checked the datasheet equations too and have found nothing that would indicate that I might have a problem. But...
    on Apr 22, 2013

  • Forum Post: RE: Inquiry regarding EN pin on TPS62510

    Chris Glaser
    Per the D/S, the device is disabled when the EN pin is low. So, it is off. Both switching FETs are open. You might also look at the newer TPS62080, TPS62060, or TPS62090.
    on May 17, 2013

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