Safety limiting intends to prevent potential damage to the isolation barrier upon
failure of input or output circuitry.
| PARAMETER |
TEST
CONDITIONS |
SIDE |
MIN |
TYP |
MAX |
UNIT |
| IS |
Safety output supply current |
RθJA
= 78.1°C/W, VDDA/B = 12 V(1), TA = 25°C, TJ = 150°C See Figure 6-2 |
DRIVER A,
DRIVER B |
|
|
64 |
mA |
| RθJA
= 78.1°C/W, VDDA/B = 25 V(1), TA = 25°C, TJ = 150°C See Figure 6-2 |
DRIVER A,
DRIVER B |
|
|
31 |
mA |
| PS |
Safety supply power |
RθJA = 78.1°C/W, TA = 25°C, TJ = 150°C See Figure 6-3 |
INPUT |
|
|
50 |
mW |
| DRIVER
A |
|
|
775 |
| DRIVER
B |
|
|
775 |
| TOTAL |
|
|
1600 |
| TS |
Safety
temperature(2) |
|
|
|
|
150 |
°C |
(1) VDDA=VDDB=12V is used for the test condition of 5V and 8V UVLO, and
VDDA=VDDB=25V is used for 12V UVLO.
(2) The maximum safety temperature is the
maximum junction temperature specified for the device. The power dissipation and
junction-to-air thermal impedance of the device installed in the application hardware
determines the junction temperature. The assumed junction-to-air thermal resistance in the
Thermal Information table is that of a device installed on a High-K test
board for leaded surface mount packages. Use these equations to calculate the value for
each parameter:
TJ = TA + RθJA ×
P, where P is the power dissipated in the device.
TJ(max) = TS = TA +
RθJA × PS, where T
J(max) is the
maximum allowed junction temperature.
PS = IS ×
VI, where V
I is the maximum input voltage.