TLE5226G Datasheet, PDF (8/13 Pages) Siemens Semiconductor Group – Smart Quad Channel Low-Side Switch

TLE 5226 G
Open load is detected for all four channels in on and off mode. In the on mode the load current is moni-
tored. If it drops below the specified threshold value, then an open load condition is detected.
In the off mode, the ouput voltage is monitored.
An open load condition is detected when the output voltage of a given channel is below 55 % of the
supply voltage VS. Also the output voltages of two outputs are compaired against each other in off
condition with a fixed offset of typ. 1.25 V to recognize GND bypasses. To suppress fault diagnosis
during the flyback phase of the compared output, the diagnostic circuit includes a latch function.
Reset of this latch is done at end of the flyback phase, additionally it can be reseted by a low signal on
the enable input or a high signal of the input line.
See block diagramm of open load detection on page 3.
Diagnostic Table
In general the status follows the input signal in normal operating conditions.
If any error is detected the status is inverted.
Operating Condition
Standby
Normal function
Open load or short to ground
Overload or short to supply
latched overload
reset latch
Overtemperature
latched overtemperature
reset latch
Standby
Input
STBY
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
Enable
Input
ENA
X
L
L
H
H
L
L
H
H
H
H
L
X
H
H
L
X
Control
Input
IN
X
L
H
L
H
L
H
L
H
H
H
H
H→L
H
H
H
H→L
Power
Output
OUT
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
Status
Output
ST
H
L
L
L
H
H
H
H
L
L
L
H
L
L
L
H
L
Semiconductor Group
Page ₈
1998-02-04