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ELECTRICAL CHARACTERISTICS TIMING RESISTOR AND CLOCK(RT/CLK PICN) Data sheet p5.

This document addresses critical questions regarding the switching frequency of the TPS54340-Q1 when using a timing resistor of 200 kΩ. It examines the calculated frequency of 487.7 kHz as derived from electrical characteristics, highlighting the accuracy at both 1.9 MHz and with an external clock. The inquiry seeks to confirm the correctness of the frequency calculation and determine the acceptable accuracy range, which is presumed to be ±10%. This information is vital for effective design and evaluation of power management solutions.

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ELECTRICAL CHARACTERISTICS TIMING RESISTOR AND CLOCK(RT/CLK PICN) Data sheet p5.

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  1. TPS54340-Q1 Question of Frequency Question 1 There is switching frequency at Rt=200kohm But It become 487.7kHz when I substitute 200 for the following expression. Which is right? I think that a calculating formula is right. ELECTRICAL CHARACTERISTICS TIMING RESISTOR AND CLOCK(RT/CLK PICN) Data sheet p5. = = 487.7kHz

  2. Question 2 What accuracy of frequency at 1.9MHz? Is accuracy ±10%? Question 3 What accuracy of frequency at External Clock 1.9MHz?

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