TLE8386-2EL Datasheet, PDF (19/32 Pages) Infineon Technologies AG – Basic Smart Boost Controller

TLE8386-2EL
Protection and Diagnostic Functions
9
Protection and Diagnostic Functions
9.1
Description
The TLE8386-2EL has integrated circuits to protect against output overvoltage, open feedback and
overtemperature faults. During an overvoltage the gate driver outputs SWO will turn off. In the event of an
overtemperature condition the integrated thermal shutdown function turns off the gate drivers and internal linear
voltage regulator. If the connection from pin FB to the output voltage resistor divider should be lost, an internal
current source connected to Pin FB will draw the voltage above this limit and shut the external MOSFET off. The
typical junction shutdown temperature is 175°C. After cooling down the IC will automatically restart operation.
Thermal shutdown is an integrated protection function designed to prevent immediate IC destruction and is not
intended for continuous use in normal operation.
9.2
Electrical Characteristics
V_IN = 6V to 40V; T_j = -40 °C to +150 °C, all voltages with respect to ground, positive current flowing into pin; (unless
otherwise specified)
Pos. Parameter
Symbol
Limit Values
Unit Conditions
Min. Typ. Max.
Temperature Protection:
9.2.1 Over Temperature Shutdown T_j,SD
160 175 190 °C –
9.2.2
Over Temperature Shutdown
Hystereses
T_j,SD,HYST –
15
–
°C –
Overvoltage Protection:
9.2.3
Output Over Voltage Feedback V_OVFB,TH 8
Threshold Increasing
9.2.4
Output Over Voltage Feedback V_OVFB,HYS
Hysteresis
9.2.5 Over Voltage Reaction Time t_OVPRR 2
10
12
% 10% higher of
regulated voltage
5
% Output Voltage
decreasing
–
10
µs Output Voltage
decreasing
Note: Integrated protection functions are designed to prevent IC destruction under fault conditions described in the
data sheet. Fault conditions are considered as “outside” normal operating range. Protection functions are
not designed for continuous repetitive operation.
Data Sheet
17
Rev. 1.0, 2010-10-25