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Q67006-A9357 Datasheet(PDF) 4 Page - Siemens Semiconductor Group |
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Q67006-A9357 Datasheet(HTML) 4 Page - Siemens Semiconductor Group |
4 / 16 page TLE 4263 Semiconductor Group 4 1998-11-01 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 the series transistor via a buffer. Saturation control as a function of the load current prevents any over-saturation of the power element. If the externally scaled down output voltage at the reset threshold input drops below 1.35 V, the external reset delay capacitor is discharged by the reset generator. If the voltage on the capacitor reaches the lower threshold V ST, a reset signal is issued on the reset output and not cancelled again until the upper threshold V dT is exceeded. If the reset threshold input is connected to GND, reset is triggered at an output voltage of 4.5 V. A connected microcontroller is controlled by the watchdog logic. If pulses are missing, the reset output is set to low. The pulse sequence time can be set within a wide range with the reset delay capacitor. The IC can be switched at the TTL-compatible, low-active inhibit input. The IC also incorporates a number of internal circuits for protection against: q Overload q Overtemperature q Reverse polarity Block Diagram Input 18 AEB01100 20 GND 4-7, 14-17 Output 12 9 3 10 Reset Delay Reset Output Reset Threshold Watchdog 11 Temperature Sensor Generator Reset Reference Bandgap Adjustment Buffer Control Amplifier Saturation Control and Protection Circuit Inhibit |
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