TLE8082ES datasheet(36/61 Pages) INFINEON

36 / 61 page

Power stages

7.1

Outputs 1 to 3 - inductive load drivers

The TLE8082ES implements 3 low-side switches. Output 1 to 3 are intended to drive inductive loads like

injectors, valves or relays. The outputs contain a clamping circuit for freewheeling of inductive loads.

The control of OUT1 can be configured to direct drive with input pin IN1 or SPI control. OUT2 and OUT3 can be

configured to direct drive with input pin IN23 or SPI control. The output configuration can be determined in the

configuration register.

If the pin control is selected, a high level at input pins IN1 and IN23 switches on the respective output (see

Figure 11).

7.2

Output 4 - O2 heater driver

The low-side switch output 4 is intended to drive resistive loads like O2 heaters. The output contains a clamping

circuit for freewheeling of inductive loads, too.

The TLE8082ES provides a current feedback output. The provided sink current at pin CFB4 is proportional to

the current of OUT4. If OUT4 is switched off, CFB4 is in high ohmic state. The output current at pin CFB4 can be

calculated as follows.

ICFB4=gCFB4·IOUT4

Equation 1

The control of OUT4 can be configured to direct drive with input pin IN4 or SPI control.

If pin control is selected, a high level at input pin IN4 switches on OUT4 (see Figure 11).

7.3

Protection and diagnosis of low-side output stages

All low-side output stages are protected against overcurrent.

If the current through a power stage is above the Overcurrent detection threshold for a time longer

than Overcurrent switch off filter time, an overcurrent is detected and the affected powerstage is switched

off. Additionally, the according overcurrent bit in register Diag1 is set.

The following conditions must be fulfilled to switch on the powerstages after an overcurrent event has

occurred:

•

no overcurrent condition

•

readout of register Diag1 to reset the diagnosis bit

•

power stage switch on command (SPI switch-on command or positive edge at pin INx)

All low-side output stages are protected against overtemperature.

If the power stage temperature is above the OUTx overtemperature detection threshold for a time longer

than OUTx overtemperature filter time, an overtemperature is detected and the affected powerstage is

switched off. Additionally, the overtemperature bit in register Diag1 is set. An Overtemperature hysteresis

avoids a premature switch on.

The following conditions must be fulfilled to switch-on the powerstages after an overtemperature event has

occurred:

•

no overtemperature condition

•

readout of register Diag1 to reset the diagnosis bit

•

switch-on command (SPI switch on command or positive edge at pin INx)

The OUT3 output switching status (ON/OFF) is detected by Diagnosis in off threshold high. The status bit

O3Stat in register Diag0 is "1" with an output voltage below the threshold.

TLE8082ES

Small engine management IC

Power stages

Datasheet

Rev. 1.0

2021-03-23

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