Safety limiting intends to minimize potential damage to the isolation barrier upon failure of input or output circuitry.
| PARAMETER |
TEST CONDITIONS |
MIN |
TYP |
MAX |
UNIT |
| IS |
Safety input, output, or supply current (side 2)(1) |
RθJA = 116.4°C/W, VI = 5 V, TJ = 150°C, TA = 25°C |
|
|
0.22 |
A |
| PS |
Safety input, output, or total power(1) |
RθJA = 116.4°C/W, TJ = 150°C, TA = 25°C |
|
|
1.1 |
W |
| TS |
Safety temperature(1) |
|
|
|
150 |
℃ |
(1) The maximum safety temperature, T
S, has the same
value as the maximum junction temperature, T
J, specified for the device. The
I
S and P
S parameters represent the safety current and safety power
respectively. The maximum limits of I
S and P
S should not be exceeded.
These limits vary with the ambient temperature, T
A.
The junction-to-air thermal resistance, R
θJA,
in the
Section 5.4 table is that of a device installed on a device evaluation board. Use these
equations to calculate the value for each parameter:
T
J = T
A + R
θJA × P, where P is
the power dissipated in the device.
T
J(max) = T
S = T
A +
R
θJA × P
S, where T
J(max) is the maximum allowed junction
temperature.
P
S =
I
S × V
I, where V
I is the maximum input voltage.