TLE6284G_08 Datasheet, PDF (9/17 Pages) Infineon Technologies AG – H-Bridge Driver IC

Data Sheet TLE6284G
output stage the ER1 is pulled down. This shut down can be caused by undervoltage or
short circuit. In this condition ER2 indicates the reason for the shut down.
Condition of
ER1 pin
5V
5V
0V
0V
Condition of
ER2 pin
5V
0V
5V
0V
Function
no errors
overtemperature warning of driver IC
Shut down of any output stage caused by short circuit
Shut down of any output stage caused by undervoltage
Recommended Start-up procedure
The following procedure is recommended whenever the Driver IC is powered up:
• Disable the Driver IC via DT/DIS pin
• Wait until the bootstrap capacitors of High Side MOSFET C_Bx are charged (the waiting
time depends on application conditions, e.g. C_Bx and RBx)
• Enable the Driver IC via DT/DIS pin
• Start the operation by applying the desired pulse patterns. Do not apply any pulse pat-
terns to the PWM or DIR pin, before the C_Bx capacitors are charged up.
Short Circuit protection
The current threshold limit to activate the Short Circuit protection function can be adjusted to
larger values, it can not be adjusted to lower values. This can be done by external resistors
to form voltage dividers across the “sense element” (pls. see Application block diagram on
pg. 2), consisting of the Drain-Source-Terminals, a fraction of the PCB trace and – in some
cases – current sense resistors (used by the µC not by the Driver IC).
The Short Circuit protection can be disabled for the High Side MOSFETs by shorting DH1
with SH1 and DH2 with SH2 on the PCB; in this case the DHx pins may not be connected to
the Drains of the associated MOSFETs. To disable Short Circuit protection for the Low Side
MOSFETs the DL1 and DL2 pin should be connected to the Driver IC´s Ground.
Shut down of the driver
A shut down can be caused by undervoltage or short circuit.
A short circuit will shut down only the affected Mosfet until a reset of the error register by a
disable of the driver occurs. A shut down due to short circuit will occur only when the Short
Circuit criteria V_DS(SCP) is met for a duration equal to or longer than the Short Circuit filter time
t_SCP(off). Yet, the exposure to or above V_DS(SCP) is not counted or accumulated. Hence, repeti-
tive Short Circuit conditions shorter than t_scp(off) will not result in a shut down of the affected
MOSFET.
An undervoltage shut down shuts only the affected output down. The affected output will
auto restart after the undervoltage situation is over.
Operation at Vs<12V
If Vs<11.5V the gate voltage will not reach 10V. It will reach approx Vs-1.5V, dependent on
duty cyle, bootstrap capacitor, total gate charge of the external Mosfet and switching fre-
quency.
Data Sheet
9
Rev 2.4 2008-03-18