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TLE5205-2S Datasheet(PDF) 6 Page - Infineon Technologies AG |
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TLE5205-2S Datasheet(HTML) 6 Page - Infineon Technologies AG |
6 / 23 page TLE 5205-2 Overview Data Sheet 6 2001-06-19 1.7 Monitoring Functions Undervoltage lockout (UVLO): When V S reaches the switch on voltage VSON the IC becomes active with a hysteresis. All output transistors are switched off if the supply voltage V S drops below the switch off value V SOFF. 1.8 Protective Function Various errors like short-circuit to + V S, ground or across the load are detected. All faults result in turn-OFF of the output stages after a delay of 50 µs and setting of the error flag EF to ground. Changing the inputs resets the error flag. a. Output Shorted to Ground Detection If a high side transistor is switched on and its output is shorted to ground, the output current is internally limited. After a delay of 50 µs all outputs will be switched-OFF and the error flag is set. b. Output Shorted to + V S Detection If a low side transistor is switched on and its output is shorted to the supply voltage, the output current is internally limited. After a delay of 50 µs all outputs will be switched-OFF and the error flag is set. c. Overload Detection An internal circuit detects if the current through the low side transistor exceeds the trippoint I SDL. In this case all outputs are turned off after 50 µs and the error flag is set. d. Overtemperature Protection At a junction temperature higher than 150 °C the thermal shutdown turns-OFF, all four output stages commonly and the error flag is set with a delay. e. Open Load Detection The output Q1 has a 10 k Ω pull-up resistor and the output Q2 has a 10 kΩ pull-down resistor. If E1 and E2 are high, all output power stages are turned-OFF. In case of no load between Q1 and Q2 the output voltage Q1 is V S and Q2 is ground. This state will be detected by two comparators and an error flag will be set after a delay time of 50 µs. Changing the inputs resets the error flip flop. |
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