BTS6480SF datasheet(40/73 Pages) INFINEON

40 / 73 page

Data Sheet

Rev. 1.0, 2010-04-12

SPOC - BTS6480SF

Protection Functions

Figure 17

Dynamic Temperature Sensor Operations with latch due to reaching over temperature

j(SC)

The ERR-flag will be set during dynamic temperature sensor shut down. It can be reset by reading the ERR-flag.

If the channel is still in dynamic temperature sensor shut down, the ERR-flag will be set again. During the

automatic restart of the channel the ERR-flag can be cleared by reading the ERR-flag. It will be set again as soon

as the dynamic temperature sensor is activated again.

8.5

Reverse Polarity Protection

In reverse polarity mode, power dissipation is caused by the intrinsic body diode of each DMOS channel as well

as each ESD diode of the logic pins. The reverse current through the channels has to be limited by the connected

loads.The current through the ground pin, sense pin IS, current sense synchronization pin, the logic power supply

pin VDD, the SPI pins, input pins, external driver pins, clock input pin and the limp home input pin has to be limited

as well (please refer to the maximum ratings listed on Page 10).

For reducing the power loss during reverse polarity ReversaveTM functionality is implemented for all channels.

They are turned on to almost forward condition in reverse polarity condition, see parameter

DS(REV).

Note: No protection mechanism like temperature protection or current protection is active during reverse polarity.

8.6

Over Voltage Protection

In the case of supply voltages between

BB(SC) max and VBB(CL) the output transistors are still operational and follow

the input or the OUT register. Parameters are not warranted and lifetime is reduced compared to normal mode.

In addition to the output clamp for inductive loads as described in Section 6.3, there is a clamp mechanism

available for over voltage protection for the logic and all channels.

ERR

DeltaT_OT.emf

CL = 1

DS(Vtrip)

L(trip)

over load

normal

operation

IN /

OUTx

j(startn) + ∆Tj(res)

j(start1)

j(start1) + ∆Tj(res)

j(start1) + ∆Tj(SW)

n = 1

over load

removed

j(SC)

n < n

retry

* ERR-flag will be reset by standard

diagnosis readout during restart

Switch off by dynamic

temperature sensor

Restart by dynamic

temperature sensor

Latch OFF due to

over temperature

∆T

jSW

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