TLE 4247EL40 Infineon Technologies, TLE 4247EL40 Datasheet - Page 8

• Manufacturer Part Number: TLE 4247EL40
• Manufacturer: Infineon Technologies

Specifications of TLE 4247EL40

• Packages: PG-DSO-8
• Regulator Type: coil/relay driver
• Output Voltage: n/a
• Accuracy: -
• Max. Output Current: 40mA
• Dropout Voltage: n/a

5
5.1
The TLE4247 provides two different operation modes: For relay activation, the IC pass element works as an
activated switch with lowest dropout voltage
the IC switches to hold mode regulating the relay coil current to constant values (see Figure 3 b).
During commutation, the relay coil current flows from the IC input “IN” to “S” into the relay freewheeling resistor.
A zener structure prevents the IC from overvoltage by limiting the input voltage transient to
The relay activation time period
current. This time period starts once the IC supply voltage exceeds
below the threshold
battery voltage.
At low supply voltage, the IC switches to “Low Voltage Mode” with lowest current consumption. As in activation
mode, the IC is working as a switch with lowest dropout voltage.
In order to prevent the IC from excessive power dissipation at high supply voltage, the IC is working as a switch
(High Voltage Mode). A transition to Hold Mode during this mode is not possible.
An overtemperature protection circuit prevents the IC from immediate destruction under fault conditions by
reducing the output current. A thermal balance below 200 °C junction temperature will be established. Please note
that a junction temperature above 150 °C is outside the maximum ratings and reduces the IC lifetime.
Figure 3
Datasheet
Operation Modes
Description
Operation as switch or current source
V
S,Hold-Actv
, the IC changes to active mode allowing maximum relay current flow at low vehicle
t
Actv
is generated by charging the external capacitor
V
DR
(see Figure 3 a). After the activation time period
8
V
S,Start
. In case the IC supply voltage
C
D
at pin D with a constant
Rev. 1.01, 2010-05-04
V
Z
.
Operation Modes
t
Actv
has elapsed,
TLE4247
V
S
falls