6.12 Safety Limiting Values (DWV Package)

Safety limiting(1) intends to minimize potential damage to the isolation barrier upon failure of input or output circuitry. A

failure of the I/O can allow low resistance to ground or the supply and, without current limiting, dissipate sufficient power to

over-heat the die and damage the isolation barrier potentially leading to secondary system failures.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

IS

Safety input, output, or supply current

RθJA = 102.8°C/W, VDDx = 5.5V,

TJ = 150°C, TA = 25°C

220

mA

PS

Safety input, output, or total power

RθJA = 102.8°C/W, TJ = 150°C, TA = 25°C

1210

mW

TS

Maximum safety temperature

150

°C

(1)

The maximum safety temperature, TS, has the same value as the maximum junction temperature, TJ, specified for the device. The IS

and PS parameters represent the safety current and safety power, respectively. Do not exceed the maximum limits of IS and PS. These

limits vary with the ambient temperature, TA.

The junction-to-air thermal resistance, RθJA, 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 TJ(max) is the maximum junction temperature.

PS = IS × VDDmax, where VDDmax is the maximum supply voltage for high-side and low-side.

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