Supply pins and decoupling

AN3326

14/21

DocID18333 Rev 3

Figure 5. External ballast decoupling capacitors

1.

The 20 µF capacitor shall be placed as close as possible to the collector of the ballast.

In case the user would like to use the SPC56EL60x with the internal ballast, the capacitor of

Figure 5 are not needed.

Note:

A base capacitor is not needed in external or internal ballast configuration.

Figure 6 shows the decoupling capacitors needed by the logic supply pins (1.2 V). The

number of these pins depends on the chosen SPC56EL60x package (for example, the 144-

pin package includes six pairs of logic supply pins).

Figure 6. Core logic decoupling capacitors

1.

Total value of these capacitors shall be between 300nF and 900nF and total ESR between 1mOhm and

100mOhm.