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tps61200 - Enable with High Signal for only 5ms

Den S.
Prodigy 60 points
Other Parts Discussed in Thread: TPS61200

Hallo all,

My name is Dennis.

I have a question about tps61200:  i have a schematic with a supercap as power supply connected ti Vin of tps61200, supercap will be loaded up to 1,6-1,8V , C=100mF low ESR of about 10 Ohms. Would i be able to switch the tps on with a short Logic High Signal of about 5ms from a µC? If yes, would tps "go sleep" after 5ms and how much voltage at EN is requiered for such short on/off switch? The Purpose of the schematic is to switch with power from supercap an smd bistable relais (requieres power of 200mW at 5ms time).

Thanks

  • 0
    TI__Expert 7240 points

    Hello Dennis,

    To answer your first question, you WILL be able to switch the tps61200 on with a pulse of 5 ms from a microcontroller.  From Figure 22 of the datasheet, you can see that it takes around 300 µs for the output voltage to respond to enable turning on.  When the enable voltage goes low, the chip will go into shutdown mode and the load will be disconnected from the input.  The time it takes for the output to reach 0 V will depend on the load itself and the value of your output capacitor.  Lastly, the EN pin will require a minimum voltage of 1.2 V for your specific input voltage (pg. 3 of the datasheet).

    Ben

  • 0 in reply to Ben Hopf
    Prodigy 60 points

    Thanks Ben!!