JAJSFQ6E March 2014 – July 2018 TPS92601-Q1 , TPS92602-Q1
UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA.
Assume a maximum LED current ripple of 0.1 × I(LED). Also, assume that the dynamic impedance of the chosen LED is 0.2 Ω (1.8 Ω total for the nine-LED string). The total output-voltage ripple calculation is then as per Equation 28.
Assuming a ripple contribution of 95% from bulk capacitance, Equation 29 calculates the output capacitor.
Use three 3.3-μF capacitors in parallel to achieve the minimum output capacitance of 10 μF. Ensure that the chosen capacitors meet the minimum bulk capacitance requirement at the operating voltage.