TLE8201R datasheet(25/45 Pages) INFINEON

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TLE 8201R

Data Sheet Rev. 2.0

2006-06-07

4.4

Power-Outputs 1-6 (Bridge Outputs)

4.4.1

Protection and Diagnosis

4.4.1.1

Short Circuit of Output to Ground or Vs

The low-side switches are protected against short circuit to supply and the high-side

switches against short to GND.

If a switch is turned on and the current rises above the shutdown threshold

SD for longer

than the shutdown delay time

dSD, the output transistor is turned off and the

corresponding diagnosis bit is set. During the delay time, the current is limited to

SC as

shown in Figure 9.

Figure 9

Short circuit protection

The delay time ia relatively short (typ. 25 µs) to limit the energy that is dissipated in the

device during a short circuit. This scheme allows high peak-currents as required in

motor-applications.

The output stage stays off and the error bit set until a status register reset is sent to the

SPI or a power-on reset is performed.

4.4.1.2

Cross-Current

If for instance HS1 is ON and LS1 is OFF, you can turn OFF HS1 and turn ON LS1 with

the same SPI command. To ensure that there is no overlap of the switching slopes that

would lead to a cross current, the dead-time H to L and L to H is specified.

In the control registers, it is also possible to turn ON high- and low-side switches of the

same half-bridge (e.g. LS1ON = H and HS1ON = H). To prevent a cross-current through

the bridge, such a command is not executed. Instead, both switches are turned OFF and

the Over-Load bit is set High for both switches (e.g. LS1OvL = H and HS1OvL = H).

dSD

OUT

short to Vs

OUTx

short to GND

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