TLE8110ED datasheet(34/74 Pages) INFINEON

Teilenummer	TLE8110ED

Bauteilbeschribung	Smart Multichannel Low Side Switch with Parallel Control and SPI Interface

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Hersteller	INFINEON [Infineon Technologies AG]

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Data Sheet

34

Rev. 1.0

2018-03-07

TLE8110ED

Smart Multichannel Low Side Switch with Parallel Control and SPI Interface

Protection Functions

10

Protection Functions

The device provides embedded protective functions. Integrated protection functions are designed to prevent

IC destruction under fault conditions described in this Document. Fault conditions are considered “outside”

the normal operating range. Protection functions are not designed for continuous repetitive operation.

There is an over load and over temperature protection implemented in the TLE8110ED.

If a protection function becomes active during the write cycle of Diagnosis Information into the Diagnosis

Register, the information is latched and stored into the diagnosis register after the write process.

In order to achieve a maximum protection, the affected channel with over current or over temperature (OCT)

is switched and latched OFF, channel can be turned ON again after the diagnosis register is cleared

(Chapter 12.3.2).

For the failure condition of Reverse Currents, the device contains a “Reverse Current Protection Comparator”

[RCP]. This RCP can optionally be activated by setting the DEVS.RCP Bit.

In case the comparator is activated, it detects a reverse current and switches ON the related output channel.

The channel is kept ON up to a reverse current channel dependent threshold IRCP_off. This threshold is defined

by regulators target value to keep the output voltage at >/~-0.3V. If the current exceeds a defined value, the

comparator switches OFF and other protection functions are protecting the circuit against reverse current.

That means that at higher currents / or in case RCP is de-activated / not activated, the reverse current is

flowing through the body diode of the DMOS. In that case, the voltage drops to typically -0.6V according the

voltage of the body diode. In case the comparator threshold has been exceeded and the RCP has been

switched OFF, the functions remains OFF until the reverse current arrives back to zero reverse current. Only

then, the comparator can be activated again after a delay time tRCP_on_delay.

This function reduces the un-wanted influence of a reverse current to the analogue part of the circuit (such as

the diagnosis). For more details about the functionality, see Figure 22 and Figure 23 and concerning the

settings and the related registers, refer to Chapter “Control of the Device”.

Figure 20

Block Diagram Protection Functions

Block_diag_Protection.vsd

temperature

sensor

short circuit

detection

OUTx

gate

control

Serial

control

T

Logic

Ctrl.

Ref.

-300mV

RCP

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