Data Sheet TLE6284G

Data Sheet

9

Rev 2.4 2008-03-18

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

Condition of

ER2 pin

Function

5V

5V

no errors

5V

0V

overtemperature warning of driver IC

0V

5V

Shut down of any output stage caused by short circuit

0V

0V

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

• Enable the Driver IC via DT/DIS pin

• Start the operation by applying the desired pulse patterns. Do not apply any pulse pat-

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

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.