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TLE4271-2 Datasheet(PDF) 3 Page - Infineon Technologies AG |
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TLE4271-2 Datasheet(HTML) 3 Page - Infineon Technologies AG |
3 / 23 page TLE 4271-2 Data Sheet Rev. 2.4 3 2001-04-04 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 drives the base of a series transistor via a buffer. Saturation control as a function of the load current prevents any over-saturation of the power element. The reset output RO is in high-state if the voltage on the delay capacitor C D is greater or equal V UD. The delay capacitor CD is charged with the current ID for output voltages greater than the reset threshold V RT. If the output voltage gets lower than VRT (’reset condition’) a fast discharge of the delay capacitor C D sets in and as soon as VD gets lower than V LD the reset output RO is set to low-level. The time for the delay capacitor charge from V UD to VLD is the reset delay time tD. When the voltage on the delay capacitor has reached V UD and reset was set to high, the watchdog circuit is enabled and discharges C D with the constant current IDWD. If there is no rising edge observed at the watchdog input, C D will be discharge down to VLDW, then reset output RO will be set to low and C D will be charged again with the current IDWC until V D reaches VUD and reset will be set high again. If the watchdog pulse (rising edge at watchdog input WI) occurs during the discharge period C D is charged again and the reset output stays high. After VD has reached VUD, the periodical behavior starts again. Internal protection circuits protect the IC against: • Overload • Overvoltage • Overtemperature • Reverse polarity |
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Similar Description - TLE4271-2 |
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