2.6 Boost Output Ferrite Bead

The ferrite bead FB2 connected at the boost output has a high impedance value at frequencies of around 100 MHz, which can suppress the noise in this frequency range and help reduce the conducted/radiated EMI, as shown in Figure 18 and Figure 19.

(a) With ferrite bead

(b) Without ferrite bead

Figure 18. Radiated Emissions: Boost Output Ferrite Bead

(a) With ferrite bead

(b) Without ferrite bead

Figure 19. Conducted Emissions: Boost Output Ferrite Bead