BTS6460SF Datasheet, PDF (35/72 Pages) Infineon Technologies AG – SPI Power Controller

SPOC - BTS6460SF
Protection Functions
IN /
OUTx
V _DS
V _DS(Vtrip)
I_L
I _{L(t rip)}
over current
Switch off by over
current switch off
normal
operation
t
t
T_j
T _j(SC)
T_{j(startn) +} ∆T_j(res)
T_j(start2) + ∆T_j(res)
T_j(start1) + ∆_{TTj(sj(traerst)1)}
I_IS
ERR
Restart by dynamic
temperature sensor
t
Latch OFF due to
over temperature
n=1
n < n_retry
t
*
* ERR-flag will be reset by standard
diagnosis readout during restart
t
t
CL = 1
over load
removed
CurrentTrippingDeltaT_OT.emf
Figure 11 Over current protection with latch due to reaching over temperature T_j(SC)
The ERR-flag will be set during over current shut down. It can be reset by reading the ERR-flag. If the channel is
still in over current 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 over current protection is activated
again.
The number of restarts n_retry is depending on the V_DS voltage according to the following figure and Chapter 8.2.
I
I_L(trip) ^L
I
L(Vtrip)
n = n _retry(LV)
n = n_retry(MV)
no retry
5
10
15
20
V_DS
CurrentTrippingVsVDS.emf
Figure 12 Number of retries and trip levels dependent of V_DS
The retry latch or over temperature 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_b.
Data Sheet
35
Rev. 1.0, 2010-04-12