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I am using a TPS43320 to regulate 12V to 3.3V, and was wondering what the effect of an invalid RMODE resistor is? I just noticed we are using 11.8kΩ for our RMODE, but that isn't a value in the table. Rather, 11.3kΩ is instead.
Would this cause irregular behavior or anything of the sort?
Hi Dylan,
We still recommend to use accurate 11.3k resistor with 1% or less tolerance for mode pin detection even if 11.8k works.
Generally 11.8k would be detected as 11.3k since the next gear is 14.3k.
The mode detection is realized by forcing a fixed current on the resistor during powering up and detect the voltage using a DAC to figure out which mode is chosen.
Hey Athos
Could there be any adverse effects from using the wrong resistor value?
Hi Dylan,
The wrong resistor value would influence the mode selection including current limitation, ramp compensation and soft-start time.
For example, if you use a 13k for 11.3k and be detected as 14.3k gear, the soft-start time would be changed from 1ms to 2ms.
If using a wrong resistor, the device would at least choose a adjacent mode. There couldn't be any serious effect that the device damage or couldn't start up.