The first step in the design procedure is the selection of the output filter components. To simplify this process, Table 7-2 and Table 7-3 list possible inductor and capacitor value combinations.
Table 7-2 Output Filter Selection (2.8-MHz Operation, FREQ = GND)| INDUCTOR VALUE (μH)(3) | OUTPUT CAPACITOR VALUE (μF)(2) |
|---|
| 10 | 22 | 47 | 100 | 150 |
|---|
| 0.47 | — | √(1) | √ | √ | √ |
| 1 | √ | √ | √ | √ | √ |
| 2.2 | — | — | — | — | — |
| 3.3 | — | — | — | — | — |
(1) Typical application configuration. Other check marks indicate alternative filter combinations.
(2) Capacitance tolerance and bias voltage de-rating is anticipated. The effective capacitance varies by +20% and –50%.
(3) Inductor tolerance and current de-rating is anticipated. The effective inductance varies by +20% and –30%.
Table 7-3 Output Filter Selection (1.4-MHz Operation, FREQ = VIN)| INDUCTOR VALUE (μH)(3) | OUTPUT CAPACITOR VALUE (μF)(2) |
|---|
| 10 | 22 | 47 | 100 | 150 |
|---|
| 0.47 | — | √ | √ | √ | √ |
| 1 | √ | √(1) | √ | √ | √ |
| 2.2 | √ | √ | √ | √ | √ |
| 3.3 | — | — | — | — | — |
(1) Typical application configuration. Other check marks indicate alternative filter combinations.
(2) Capacitance tolerance and bias voltage de-rating is anticipated. The effective capacitance varies by +20% and –50%.
(3) Inductor tolerance and current de-rating is anticipated. The effective inductance varies by +20% and –30%.