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Q67000-A9059 Datasheet(PDF) 2 Page - Siemens Semiconductor Group |
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Q67000-A9059 Datasheet(HTML) 2 Page - Siemens Semiconductor Group |
2 / 18 page TLE 4261 Semiconductor Group 2 1998-11-01 Application Description The IC regulates an input voltage V I in the range VI = 6 V to 40 V to VQrated = 5.0 V. A reset signal is generated for a maximum output voltage of V Q less than 4.75 V. The reset delay can be set externally with a capacitor. A connected microprocessor is monitored by the integrated watchdog circuit. Connecting this input to the input voltage makes the watchdog function inactive. The presence of a voltage less than 2 V on inhibit input disables the regulator. The current consumption drops 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 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 is 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: q Overload q Overvoltage q Overtemperature q Reverse polarity |
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Similar Description - Q67000-A9059 |
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