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Q: TPS61070 overvoltage protection by 209201
A customer is using TPS61070 as LED driver. What happen if the load is disconnected, LED open? it seems to me that in this situation the device will blow up due to lack of overvoltage protection. Is it correct?
If it is used as voltage output driver it will be able to work with no load condition. correct?
A: Re: TPS61070 overvoltage protection by 1090425
Yes, there is no over voltage protection on this IC. If the LED opens, it will try to get the FB pin to be 0.5V by continually increasing the duty cycle. This will lead to a failure of the IC.
One way to overcome this is to use a zener diode from Vout to FB. It should react quickly and this would short Vout to FB which would disable the IC.
Yes, the TPS61070 can be operated at no load in a constant voltage output configuration.
We have other parts that can perform this function and protect against too high of an output voltage. See the new TPS61260.
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