The ISOW644x devices have multiple protection features to create a robust system level design.

• The device is protected against output overload and short circuit. Output voltage starts dropping when the power converter is not able to deliver the current demanded during overload conditions. For a V_ISO short-circuit to ground, the duty cycle of the converter is limited to help protect against any damage.
• Thermal protection is also integrated to help prevent the device from getting damaged during overload and short-circuit conditions on the isolated output. Under these conditions, the device temperature starts to increase. When the temperature goes above 165°C, thermal shutdown activates and the primary controller turns off which removes the energy supplied to the V_ISO load, which causes the device to cool off. When the junction temperature goes below 150°C, the device starts to function normally. If an overload or output short-circuit condition prevails, this protection cycle is repeated. Care must be taken in the design to prevent the device junction temperatures from reaching such high values.