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ZHCS142F April 2011 – February 2020 AMC1204

PRODUCTION DATA.

6.8 Safety Limiting Values

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

PARAMETER		TEST CONDITIONS	MAX	UNIT
I_S	Safety input, output, or supply current	DW-package, R_θJA = 78.5°C/W, T_J = 150°C, T_A = 25°C, AVDD = DVDD = 5.5 V, see Figure 2	289	mA
I_S	Safety input, output, or supply current	DWV-package, R_θJA =106.5°C/W, T_J = 150°C, T_A = 25°C, AVDD = DVDD = 5.5 V, see Figure 2	213	mA
P_S	Safety input, output, or total power⁽¹⁾	DW-package, R_θJA = 78.5°C/W, T_J = 150°C, T_A = 25°C, see Figure 3	1592	mW
P_S	Safety input, output, or total power⁽¹⁾	DWV-package, R_θJA = 106.5°C/W, T_J = 150°C, T_A = 25°C, see Figure 3	1173	mW
T_S	Maximum safety temperature		150	°C

(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. Do not exceed the maximum limits of I_S and P_S. 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 a high-K test board for leaded surface-mount packages. 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 junction temperature.
P_S = I_S × AVDD_max + I_S × DVDD_max, where AVDD_max is the maximum high-side supply voltage and DVDD_max is the maximum controller-side supply voltage.