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TPS4306x Low Frequency operation

george najarian
Prodigy 10 points

The specs shows this part operating down to 50khz using a 1.15M resistor. If I externally clock the chip it claims the minimum frequency is 300khz. Why is there a discrepancy? Is there any way to externally clock the controller down to 50Khz?

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    TI__Guru**** 191445 points

    I do not support that part directly, but TPS4306X has an internal PLL circuit for external clock.  The internal clock is set by a different circuit the forces the RT/CLK pin to a regulated voltage and then senses the current out of RT to set the frequency.  It is likely that those to circuits have different limits for low frequency.