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BTS3035EJ データシート(PDF) 18 Page - Infineon Technologies AG

部品番号 BTS3035EJ
部品情報  Smart Low-Side Power Switch
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メーカー  INFINEON [Infineon Technologies AG]
ホームページ  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

BTS3035EJ データシート(HTML) 18 Page - Infineon Technologies AG

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Datasheet
18
Rev. 1.0
2016-09-12
HITFET - BTS3035EJ
Smart Low-Side Power Switch
Protection Functions
6
Protection Functions
The device provides embedded protection functions. Integrated protection functions are designed to prevent
IC destruction under fault conditions described in the datasheet. Fault conditions are considered as “outside”
normal operation. Protection functions are not designed for continuous repetitive operation.
6.1
Over Voltage Clamping on OUTput
The BTS3035EJ is equipped with a voltage clamp circuitry that keeps the drain-source (output to GND) voltage
VDSat a certain level VOUT(CLAMP). The over voltage clamping is overruling the other protection functions. Power
dissipation has to be limited to not exceed the maximum allowed junction temperature.
This function is also used in terms of inductive clamping. Please see also Chapter 5.3.1 for more details.
6.2
Thermal Protection
The device is protected against over temperature due to overload and / or bad cooling conditions. To ensure
this a temperature sensor is located in the power MOSFET.
The BTS3035EJ has a thermal protection function with automatic restart. After the device has switched off due
to over temperature the device will stay off until the junction temperature has dropped down below the
thermal hysteresis “Thermal Protection” on Page 18.
Figure 14
Thermal protective switch OFF scenario with thermal restart
The device also features a digital feedback on the dedicated status pin. This feedback is latched and can be
read out easily by the microcontroller. Please see “Diagnostics” on Page 21 for details on this feedback.
6.3
Short Circuit Protection / Current limitation
The condition short circuit is an overload condition to the device. If the load current reaches the limitation
value of IL(LIM) the device limits the current and therefore will start heating up. When the thermal shutdown
temperature is reached, the device turns off.
The time from the beginning of current limitation until the over temperature switch off depends strongly on
the cooling conditions.
IN
0V
5V
t
Thermal shutdown
t
Tj
TJ(SD)
ΔT
J(SD)_HYS
Thermal _fault_restart.emf
VOUT
VBAT
t
Thermal restart


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