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 current (side 1)(1) | RθJA = 36.6°C/W, TJ = 150°C, TA = 25°C, see Figure 7-14 | | | 30 | A |
IS | Safety input, output, or supply current (side 2)(1) | RθJA = 36.6°C/W, VI = 5 V, TJ = 150°C, TA = 25°C, see Figure 7-15 | | | 0.68 |
PS | Safety input, output, or total power(1) | RθJA = 36.6°C/W, TJ = 150°C, TA = 25°C, see Figure 7-16 | | | 3.4 | 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
Thermal Information table is that of a device installed on the
TMCS1107EVM. 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.