SI88240ED-IS Datasheet, PDF (21/48 Pages) Silicon Laboratories – QUAD DIGITAL ISOLATORS WITH DC-DC CONVERTER

Si88x4x
2.3.7. Compensation
The dc-dc converter uses peak current mode control. The loop is compensated by connecting an external resistor
in series with a capacitor from the COMP pin to GNDB. The compensation resistance, RCOMP is fixed at 49.9 k
for Si882xx/3xx and 100 k for Si884xx/6xx to match internal resistance. Capacitance value is given by the
following equation, where f_C is crossover frequency:
CCOMP = -----------------------------⁶-----------------------------
2    f_C  RCOMP
For more details on the calculations involved, please see “AN892: Design Guide for Isolated DC/DC Using the
Si882xx/883xx”.
2.3.8. Thermal Protection
A thermal shutdown circuit is included to protect the system from over-temperature events. The thermal shutdown
is activated at a junction temperature that prevents permanent damage from occurring.
2.3.9. Cycle Skipping
Cycle skipping is included to reduce switching power losses at light loads. This feature is transparent to the user
and is activated automatically at light loads. The product options with integrated power switches (Si882xx/3xx) may
never experience cycle skipping during operation even at light loads while the external power switch options
(Si884xx/6xx) are likely to have cycle skipping start at light loads.
Preliminary Rev. 0.6
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