tle5212g Infineon Technologies Corporation, tle5212g Datasheet - Page 5

• Manufacturer Part Number: tle5212g
• Description: Smart Sixfold Low-side Switch Smart Sixfold Low-side
• Manufacturer: Infineon Technologies Corporation

TLE 5212 G
Application Description
Applications in automotive electronics call for intelligent power switches that can be
activated by logical signals, which have to be shorted load protected and which provide
error feedback.
This IC contains six power switches connected to ground (low-side switches). On
inductive loads the integrated Z-diodes clamp the discharging voltage. In addition there
is a 5 mA low-side-switch, which is not protected against overload and which is not
included in the error monitoring.
The IC can be connected directly to the battery voltage (5.5 V … 24 V).
By means of TTL signals on the control inputs (active HIGH) all six switches can be
activated independently of one another. The inputs are highly resistive and therefore
must not be left unconnected but should always be on fixed potential (noise immunity).
The serial error feedback interface is cascadeable (see diagram).
Circuit Description
Input Circuits
The control inputs consist of TTL-compatible Schmitt-triggers with hysteresis. Driven by
these stages the buffer amplifiers convert the logic signal necessary for driving the
DMOS power transistors.
Switching Stages
The output stages consist of DMOS power transistors with open drain. Each stage has
its own protective circuit for limiting power dissipation and shorted load current, which
makes the outputs shorted load protected to the supply voltage throughout the operating
range. Integrated clamp-diodes limit positive voltage spikes that occur when inductive
loads are discharged.
Monitoring and Protective Functions
Each power output is monitored for overload in its activated status. In deactivated mode
open load or short to ground can be detected and differentiated.
In case of shorted load the outputs will be shutdown after a delay time of typically 10 s.
Shutdown is stored in a flip-flop. A reactivation of the switch is only possible if the
concerned input is switched off and on again. The information of every single
malfunction is registered and stored in the serial diagnostic interface.
If the junction temperature raises beyond 170 C the bit for thermal overload in the serial
diagnostic interface is set. The outputs are not shutdown!
Semiconductor Group
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