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TPS61230: About TPS61230 shorts to ground and minimum start- up Load Resistance

user3891031
Prodigy 30 points
Part Number: TPS61230
Other Parts Discussed in Thread: TPS62130

Hi,

I have two questions about TPS61230 boost converter.

1. Dose TPS61230 have short-circuit protection circuits in this chip?

I am not sure about the description of chapter 8.3.2.  If the load shorts to ground suddenly ,can TPS61230 protect itself from over-current damage?

2、TPS61230 has the requirement of minimum start-up Load Resistance，how could I evaluate the Load Resistance when the converter starts up?

      The typical loads are just some capacitors(The capacitance is bellow 1000uF)。

Thanks.

  • 0
    TI__Mastermind 46905 points
    1. if you short the output to ground before enable the device, it is OK. if short the device during the device operating, there is risk that the device get damage
    2. no minimum resistance required. the graph means that if there is a small resistor from VOUT to GND (mean large load) before the device is enabled. the device could not finish startup.
  • 0 in reply to Jasper Li
    Prodigy 30 points

    You mean that the ESR of the MLCC ceramic capacitor dose not influence the start up of this converter?

    The Load in my circuits may be 200 ~ 1000uF，what's the difference of start- up waveform between 200uF and 1000uF?  I mean the pre-charge time.

    I also have a question about the pre-charge current limit of TPS61230.

    The output voltage of TPS62130 is 5V， the precharge current limit  is 2A. Is this  a constant value with the output voltage when it starts up ? I mean that if the output voltage is 3.5V, the current limit is 1.8A when it starts up , and the output voltage is 5V, the current limit will be 2A when it starts up.

    Otherwise it increases with the output voltage starts-up from 0.4A to 2A?

    Thanks.

  • 0 in reply to user3891031
    TI__Mastermind 46905 points
    You are correct, the ESR of the capacitor doesn't influence the startup.

    the current limit will increase with the real output voltage (not the setting output voltage). it is typical 0.55A if the real output voltage is 0V and 2.6A if the output voltage is 3.5V.
  • 0 in reply to Jasper Li
    Prodigy 30 points

    Thank you , Jasper Li !