TD230D datasheet(13/15 Pages) STMICROELECTRONICS

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Rs e ns e

TD230

CTN

Figure 13 :

Wide Temperature Variations

Rse nse

TD23 0

Figure 14 : Temporisation

Trace A represents the ripple voltage on CBOOST

(200mV width).

Trace B represents the voltage perturbation due to

the Step-Up converter on the output (source of the

power Mosfet = Board power supply).

Traces 1 and 2 represent the same, but improved

thanks to the Step-Up Noise reduction RC.

5.2. Precision Enhancement

If the system needs accurate current limitation in

an environment subject to very wide temperature

variations, a good way to compensate fluctuations

due to temperature variations is to use a CTN as

described in figure 13.

5.3. Temporisation

In some cases, it can be useful to let short current

peaks pass without reaction of the breaker, though

these are of higher value than the fixedcurrent limit.

This enables the Electronic Circuit Breaker to be-

have as a thermal disjonctor.

This beha viour can easily be given by adding an

RC constant as shown on figure 14.

TD230

13/15

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