SLUSDQ8D december 2019 – may 2023 TPS652353
PRODUCTION DATA
The TPS652353 device is recommended to operate with a boost inductor value of 4.7 µH or 10 µH. The boost inductor must be able to support the peak current requirement to maintain the maximum LNB output current without saturation. Use Equation 5 to estimate the peak current of the boost inductor (Ipeak).
where
With a different inductance, the system has different gain and phase margins. Figure 7-5 shows a Bode plot of boost loop with 2 × 10 µF / 35 V of boost capacitor and 4.7 µH, 5.6 µH, 6.8 µH, 8.2 µH, and 10 µH of boost inductance. As the boost inductance increases, the 0-dB crossover frequency keeps relatively constant while reducing the phase and gain margins. With a 4.7-µH boost inductance, the phase margin is 66.96° and with a 10-µH inductance, the phase margin is 39.63°.