ZHCSJF4 February 2019 TPS65295
PRODUCTION DATA.
After selecting the inductor the output capacitor needs to be optimized. In DCAP3, the regulator reacts within one cycle to the change in the duty cycle so the good transient performance can be achieved without needing large amounts of output capacitance. The recommended output capacitance range is given in Table 3.
Ceramic capacitors have very low ESR, otherwise the maximum ESR of the capacitor should be less than VOUT(ripple)/IOUT(ripple).
| VOUT (V) | Fsw (kHz) | LOUT (µH) | COUT(min) (µF) | COUT(max) (µF) |
|---|---|---|---|---|
| 1.2 | 600 | 0.68 | 88 | 132 |
| 600 | 0.56 | 88 | 132 | |
| 600 | 0.47 | 88 | 132 | |
| 2.5 | 580 | 6.8 | 20 | 66 |
| 580 | 4.7 | 20 | 66 | |
| 580 | 3.3 | 20 | 66 |
For VTT output, high quality X5R or X7R 10-µF capacitor is recommended and a 0.47 µF is recommended for VTTREF output.