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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 the device was disabled for a minimum time of approx. 3 sec. (this time was measured during lab test and may very with temperature and Vin).
The delay will vary with temperature and Vin and may be up to 10ms.
We can not guarantee startup time.
In applications that require a certain minimum startup time the TPS63030 may not meet this requirements.
Possible solution :
- Switch to TPS63000. The TPS63000 does not show this statup delay, the startup circuitry in the TPS63000 and TPS63030 is not the same.
- Another solution is to keep the TPS63030 enabled and then connect/disconnect the load with an external switch.
Why does the TPS63030 EVM have a 2.54ms delay between enable going high and the output starts turning on? I am very confused by this because the scope plots in the data sheet for the TPS63030 show the supply coming up in about 400us. The input voltage is already present and stable when EN is pulled high.
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