Safety limiting intends to minimize potential damage to the isolation barrier upon failure of input or output circuitry.
||Safety input current (side 1)(1)
||RθJA = 36.6°C/W, TJ = 150°C, TA = 25°C, see Thermal Derating Curve, Side 1.
||Safety input, output, or supply current (side 2)(1)
||RθJA = 36.6°C/W, VI = 5 V, TJ = 150°C, TA = 25°C, see Thermal Derating Curve, Side 2.
||Safety input, output, or total power(1)
||RθJA = 36.6°C/W, TJ = 150°C, TA = 25°C, see Thermal Derating Curve, Both Sides.
The maximum safety temperature, TS
, has the same value as the maximum junction temperature, TJ
, specified for the device. The IS
parameters represent the safety current and safety power respectively. The maximum limits of IS
should not be exceeded. These limits vary with the ambient temperature, TA
The junction-to-air thermal resistance, RθJA
, in the
table is that of a device installed on the
. Use these equations to calculate the value for each parameter:
× P, where P is the power dissipated in the device.
, where TJ(max)
is the maximum allowed junction temperature.
, where VI
is the maximum input voltage.