BTS6480SF datasheet(38/73 Pages) INFINEON

38 / 73 page

Data Sheet

Rev. 1.0, 2010-04-12

SPOC - BTS6480SF

Protection Functions

Figure 14

Shut Down by Over Current due to Short Circuit Type 2

8.4

Over Temperature Protection

Each channel has its own temperature sensor. If the temperature at the channel exceeds the thermal shutdown

temperature

j(SC), the channel will switch off and latch to prevent destruction (also in case of VDD = 0V). In order

to reactivate the channel, the temperature at the output must drop by at least the thermal hysteresis

∆Tj and the

over temperature latch must be cleared by SPI command HWCR.CL = 1

b. If the input pin or the bit in the SPI

setting) after the command HWCR.CL = 1

Figure 15

Shut Down by Over Temperature

8.4.1

Dynamic Temperature Sensor Protection

Additionally, each channel has its own dynamic temperature sensor. The dynamic temperature sensor improves

short circuit robustness by limiting sudden increases in the junction temperature. The dynamic temperature sensor

turns off the channel if its sudden temperature increase exceeds the dynamic temperature sensor threshold

∆Tj(SW). The number of automatic reactivations is limited by nretry (8.9.7). If this number of retries is exceeded the

channel turns off and latches. The retry latch is cleared by SPI command HWCR.CL = 1

b. If the input pin or the

bit in the SPI register OUT is still set, the channel will be turned on immediately (or according to the automatic PWM

generator setting) after the command HWCR.CL = 1

For the condition

n < n

retrythe counter of automatic

reactivations will be reset by every low to high transition on the input pin or the bit in SPI register OUT.

IIS

ERR

CurrentTrippingLowVDS .emf

CL = 1

IL(Itrip)

normal

operation

over current

normal

operation

over load

removed

IN /

OUTx

t > t

delay(trip)

ERR

OverLoad.emf

IN /

OUTx

L(trip)

j(start1)

j(start1) + ∆Tj(SW)

j(SC)

Latch OFF due to

over temperature

Latch OFF due to

over temperature

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