TLE6228_10 Datasheet, PDF (7/19 Pages) Infineon Technologies AG – Smart Quad Channel Low-Side Switch

D a t a s h e e t T L E 6 2 2 8 G P
Application Description
This IC is especially designed to drive inductive loads (relays, electromagnetic valves).
Integrated clamp-diodes limit the output voltage when inductive loads are discharged.
Four open-drain logic outputs indicate the status of the integrated ciruit. The following conditions are
monitored and signalled:
- overloading of output (also shorted load to supply) in active mode
- open and shorted load to ground in active and inactive mode
- overtemperature
Circuit Description
Input Circuits
The control and enable inputs, both active high, consist of schmitt triggers with hysteresis. All inputs are
provided with pull-down current sources. Not connected inputs are interpreted as low and the respective
output stages are switched off.
In standby mode (STBY = LOW ) the current consumption is greatly reduced.
The circuit is active when STBY = HIGH.
If the standby function is not used, it is allowed to connect the standby pin directly to VS.
Status Signals: The status signals are undefined for 2ms after a power up event or a STBY low to high
transition.
Output Stages
The four power outputs consist of DMOS-power transistors with open drains. The output stages are
short circuit protected throughout the operating range. Each output has it's own zenerclamp. This
causes a voltage limitation at the power transistor when inductive loads are switched off.
Parallel to the DMOS transistors there are internal pull down current sources. They are provided to de­
tect an open load condition in the off state. They will be disconnected in the standby mode.
Due to EMI measures there is an internal zenerclamp in parallel to the output stage. It gets active above
33V drain source voltage. This leads to an increasing leakage current up to 1 mA @ V_DS = 40V.
Protective Circuits
The outputs are protected⁶⁾ against current overload and overtemperature. If the output current in­
creases above the overload detection threshold I_QO for a longer time then t_DSO or the temperature in­
creases above T_th, then the power transistor is immediately switched off. It remains off until the control
signal at the input is switched off and on again.
Fault Detection
The status outputs indicate the switching state of the output stage. Under normal conditions is: ST = low
� Output off; ST = high � Output on. If an error occurs, the logic level of the status output is inverted,
as listed in the diagnostic table.
6) _{The integrated protection functions prevent an IC destruction under fault conditions and may not be used in normal}
operation or permanently.
V4.1
Page 7
2010-07-10