Temperature-independent undervoltage detector and related method
A detector and voltage divider technology, applied in instruments, measuring devices, measuring electrical variables, etc., can solve problems such as low operating voltage range of integrated circuits
Inactive Publication Date: 2011-06-22
STMICROELECTRONICS (SHENZHEN) R&D CO LTD
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Problems solved by technology
The general requirement to accommodate threshold voltage variability in the design of brown-out detectors limits the lower operating voltage ranges used for integrated circuits
Method used
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[0016] The specific embodiments discussed herein are examples only and do not limit the scope of the invention.
[0017] now refer to figure 2 , illustrates a schematic diagram of a brown-out detector for an integrated circuit constructed in accordance with one embodiment. The brown-out detector can operate with very little quiescent current, which is becoming a requirement in new circuit designs. Another new requirement is a lower operating threshold voltage for the input bias voltage, which requires a greater level of accuracy when detecting the input bias voltage. Operation as low as an input voltage of 7V was previously required for integrated circuit designs of controllers for power converters. The latest designs now require operation as low as 4V, which stresses many components of the circuit design. Thus, new designs are required to operate with less margin.
[0018] The brown-out detector senses the input bias voltage V by using a resistor-divider network BAT , t...
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The invention provides a temperature-independent undervoltage detector and a related method, and describes embodiments related to the undervoltage detector. The undervoltage detector is formed by using a voltage divider network to detect a low input bias voltage; and the voltage divider network comprises a first series circuit and a second series circuit of a semiconductor device, and a resistor-voltage divider, wherein the first series circuit and the second series circuit are coupled with terminals of an input bias voltage source, and the resistor-voltage divider comprises a first voltage divider-resistor and a second voltage divider-resistor which are connected in series and coupled with the first series circuit and the second series circuit. The ratio representing the number of semiconductor devices in the series circuits is substantially equal to the resistance ratio in the resistor-voltage divider; the ratios can be corrected to be equal through the existence of other resistors in the undervoltage detector; respective semiconductor devices are coupled through the configuration of diodes; and the first series circuit is coupled to a current mirror to provide a bias current for a comparer which produces an output signal for the undervoltage detector.
Description
technical field [0001] The present disclosure relates generally to the design of integrated circuits, and in particular to controlling startup voltages for integrated circuits and related methods. Background technique [0002] Integrated circuits are generally operable within a range of input bias voltages, such as a range of a maximum rated input bias voltage and a minimum rated input bias voltage. A circuit element on an integrated circuit (such as a control chip for a power converter) will not operate reliably at an input bias voltage lower than the minimum rated voltage, and the circuit element will not operate reliably at an input bias voltage higher than the maximum rated voltage may be irreversibly damaged. As a protection feature, brownout detectors are often included in the design of integrated circuits to generate the startup current for the chip and to set the minimum operating input bias voltage threshold for the chip. If the input bias voltage is less than the...
Claims
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IPC IPC(8): G01R19/165
CPCG01R19/16576
Inventor 林大松曾妮
Owner STMICROELECTRONICS (SHENZHEN) R&D CO LTD