ZHCSN39A February 2020 – November 2021 LM61480 , LM61495 , LM62460
PRODUCTION DATA
The output capacitor value and ESR determine the output voltage ripple and load transient performance. The output capacitor is usually limited by the load transient requirements rather than the output voltage ripple. Table 9-3 can be used to find capacitor values for COUT and CFF for a few common applications. Note that 4.99-kΩ RFF must be used in series with CFF. In this example, good transient performance is desired, giving 4 × 47-µF ceramic + 220-µF electrolytic as the output capacitor and 15 pF as CFF.
FREQUENCY | IOUT | TRANSIENT PERFORMANCE | 3.3-V OUTPUT | 5-V OUTPUT | ||
---|---|---|---|---|---|---|
COUT | CFF | COUT | CFF | |||
400 kHz | 10 A | Minimum | 6 x 22-µF ceramic | 15 pF | 5 x 22-µF ceramic | 15 pF |
400 kHz | 10 A | Better Transient | 6 x 22-µF ceramic + 220-µF electrolytic | 15 pF | 5 x 22-µF ceramic + 220-µF electrolytic | 15 pF |
2.2 MHz | 6 A | Minimum | 5 x 22-µF ceramic | 15 pF | 3 x 22-µF ceramic | 15 pF |
2.2 MHz | 6 A | Better Transient | 5 x 22-µF ceramic + 220-µF electrolytic | 15 pF | 3 x 22-µF ceramic + 220-µF electrolytic | 15 pF |