TLE6282G datasheet(9/16 Pages) INFINEON

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Data Sheet TLE6282G

Data Sheet

Rev 2.4 2008-03-18

Recommended Start-up procedure

The following procedure is recommended whenever the Driver IC is powered up:

• Disable the Driver IC via DT/DIS pin

• After the supply voltage has ramped up, wait for several ms to pre-charge the boot-

strap capacitors of the High Side MOSFETs CBx through the resistors R on the DLx

pins (voltage divider network, pls. see Application block diagram on pg. 2)

tWAIT ≈ 3 x CBx x 2 x R, whereas R = 10 kΩ

• 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 IHx or ILx pins, before the CBx capacitors are charged up.

Alternatively, the Driver IC can be enabled via the DT/DIS pin right after ramping up the sup-

ply voltage VS. Now, the two Low Side MOSFETs are turned on via the ILx control inputs (to

pull down the Sources of the High Side MOSFETs and to charge up the bootstrap capacitors

CBx within several 10 µs). The regular operation can be started when the bootstrap capaci-

tors 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 VDS(SCP) is met for a duration equal to or longer than the Short Circuit filter time

tSCP(off). Yet, the exposure to or above VDS(SCP) is not counted or accumulated. Hence, repeti-

tive Short Circuit conditions shorter than tscp(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 cycle, total gate charge of the external MOSFET and switching frequency.

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