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TLE4261-2 Datasheet(PDF) 2 Page - Siemens Semiconductor Group |
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TLE4261-2 Datasheet(HTML) 2 Page - Siemens Semiconductor Group |
2 / 18 page TLE 4261-2 Semiconductor Group 2 1998-11-01 Application Description The IC regulates an input voltage V I in the range 6V< VI <40V to VQrated =5.0 V. A reset signal is generated for an output voltage V O of < 4.75 V. The reset delay can be set with an external capacitor. A connected microprocessor is monitored by the integrated watchdog circuit; if pulses are missing, the reset output is set low. The pulse repetition rate can be set within wide limits with the capacitor for reset delay. If this input is connected to a voltage of > 6 V, the watchdog function is deactivated. The device also features an inhibit input, which is activated by a voltage of > 6 V and then works on this input through internal hysteresis up to approx. 3 V. A voltage of < 2 V on the inhibit input turns off the regulator, current drain then dropping to max. 50 µA. Design Notes for External Components The input capacitor C I causes a low-resistant powerline and limits the rise times of the input voltage. The IC is protected against rise times up to 100 V/ µs. It is possible to damp the tuned circuit consisting of supply inductance and input capacitance with a resistor of approx. 1 Ω in series to C I. The output capacitor maintains the stability of the regulating loop. Stability is guaranteed with a rating of 22 µF min. at an ESR of 3 Ω max. in the operating temperature range. Circuit Description The control amplifier compares a reference voltage, which is kept highly accurate by resistance adjustment, to a voltage that is proportional to the output voltage and controls the base of the series PNP transistor via a buffer. Saturation control as a function of the load current prevents any over-saturation of the power element. If the output voltage drops below 95.5% of its typical value for more than 2 µs, a reset signal is triggered on pin 3 and an external capacitor discharged on pin 5. The reset signal is not cancelled until the voltage on the capacitor has exceeded the upper switching threshold V DT. A positive-edge-triggered watchdog circuit monitors the connected microprocessor and will likewise trigger a reset if pulses are missing. The IC can be disabled by a low level on the inhibit input and the current consumption drops to < 50 µA. The IC also incorporates a number of circuits for protection against: • Overload • Overvoltage • Overtemperature • Reverse polarity |
Similar Part No. - TLE4261-2 |
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Similar Description - TLE4261-2 |
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