TMCS1101 datasheet(7/48 Pages) TI1

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TMCS1101

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SBOS825A – SEPTEMBER 2019 – REVISED MAY 2020

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(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. The maximum limits of IS and PS should not be

exceeded. 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 the TMCS1101EVM. 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 allowed junction temperature.

PS = IS × VI, where VI is the maximum input voltage.

7.8 Safety Limiting Values

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

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Safety input current (side 1)(1)

RθJA = 36.6°C/W, TJ = 150°C, TA = 25°C, see Figure 18

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 19

0.68

Safety input, output, or total power(1)

RθJA = 36.6°C/W, TJ = 150°C, TA = 25°C, see Figure 20

3.4

Safety temperature(1)

150

℃

TMCS1101 Datasheet(PDF) 7 Page - Texas Instruments