TLE6284G datasheet(9/15 Pages) INFINEON

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Data Sheet TLE6284G

2006-01-30

Condition of

ER1 pin

Condition of

ER2 pin

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 CBx are charged (the waiting

time depends on application conditions, e.g. CBx 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 CBx 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 deviders 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, dependant on

duty cyle, bootstrap capacitor, total gate charge of the external Mosfet and switching fre-

quency.

Operation at different voltages for Vs, DH1 and DH2

If DH1 and DH2 are used with a voltage higher than Vs, a duty cycle of 100% can not be

guaranteed. In this case the driver is acting like a normal driver IC based on the bootstrap

principle. This means that after a maximum “On” time of the highside switch of more than

1ms a refresh pulse to charge the bootstrap capacitor of about 1µs is needed to avoid un-

dervoltage lock out of this output stage.

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