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Q67000-A9243-A802 Datasheet(PDF) 3 Page - Siemens Semiconductor Group |
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Q67000-A9243-A802 Datasheet(HTML) 3 Page - Siemens Semiconductor Group |
3 / 19 page TLE 4270 Semiconductor Group 3 1998-11-01 Application Description The IC regulates an input voltage in the range of 5.5 V < V I < 36 V to VQnom =5.0 V. Up to 26 V it produces a regulated output current of more than 550 mA. Above 26 V the save-operating-area protection allows operation up to 36 V with a regulated output current of more than 300 mA. Overvoltage protection limits operation at 42 V. The overvoltage protection hysteresis restores operation if the input voltage has dropped below 36 V. A reset signal is generated for an output voltage of V Q < 4.5 V. The delay for power-on reset can be set externally with a capacitor. Design Notes for External Components An input capacitor C I is necessary for compensation of line influences. The resonant circuit consisting of lead inductance and input capacitance can be damped by a resistor of approx. 1 Ω in series with C I. An output capacitor CQ is necessary for the stability of the regulating circuit. Stability is guaranteed at values of C Q ≥ 22 µF and an ESR of < 3 Ω. 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. If the output voltage decreases below 4.5 V, an external capacitor C D on pin 4 (D) will be discharged by the reset generator. If the voltage on this capacitor drops below V DRL, a reset signal is generated on pin 2 (RO), i.e. reset output is set low. If the output voltage rises above 4.5 V, C D will be charged with constant current. After the power-on-reset time the voltage on the capacitor reaches V DU and the reset output will be set high again. The value of the power-on-reset time can be set within a wide range depending of the capacitance of C D. The IC also incorporates a number of internal circuits for protection against: • Overload • Overvoltage • Overtemperature • Reverse polarity |
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