Abstract: A power converter having a mechanism of dynamically controlling a minimum off time is provided. A high-side overcurrent protecting circuit determines whether or not a current flows from a high-side switch through a node between a second terminal of the high-side switch and a first terminal of a low-side switch toward an inductor, and determines whether or not the current is larger than a threshold to output a high-side overcurrent detected signal and a high-side overcurrent protecting signal. An off time adjusting circuit outputs a minimum off time signal to a driver circuit according to the high-side overcurrent protecting signal. The driver circuit determines that an overcurrent event occurs when the high-side switch is turned on according to the high-side overcurrent detected signal, and accordingly the driver circuit at least continually turns on the low-side switch during a longer minimum off time of the minimum off time signal.

Abstract: A power converter having a mechanism of dynamically controlling a minimum off time is provided. A high-side overcurrent protecting circuit determines whether or not a current flows from a high-side switch through a node between a second terminal of the high-side switch and a first terminal of a low-side switch toward an inductor, and determines whether or not the current is larger than a threshold to output a high-side overcurrent detected signal and a high-side overcurrent protecting signal. An off time adjusting circuit outputs a minimum off time signal to a driver circuit according to the high-side overcurrent protecting signal. The driver circuit determines that an overcurrent event occurs when the high-side switch is turned on according to the high-side overcurrent detected signal, and accordingly the driver circuit at least continually turns on the low-side switch during a longer minimum off time of the minimum off time signal.

Abstract: A current detecting circuit of a constant on-time power converter and a method thereof are provided. The current detecting circuit includes a time detecting circuit and a sample and hold circuit. A control circuit of the constant on-time power converter outputs a lower bridge conduction signal to turn on a lower bridge switch during an on-time of each cycle of the lower bridge conduction signal. The time detecting circuit detects the on-time of a cycle of the lower bridge conduction signal. The sample and hold circuit samples and holds a current of an inductor at a detection time point of a next cycle of the lower bridge conduction signal. A time between a rising edge of a waveform of the next cycle of the lower bridge conduction signal and the detection time point is equal to half the on-time.

Abstract: A current detecting circuit of a constant on-time power converter and a method thereof are provided. The current detecting circuit includes a time detecting circuit and a sample and hold circuit. A control circuit of the constant on-time power converter outputs a lower bridge conduction signal to turn on a lower bridge switch during an on-time of each cycle of the lower bridge conduction signal. The time detecting circuit detects the on-time of a cycle of the lower bridge conduction signal. The sample and hold circuit samples and holds a current of an inductor at a detection time point of a next cycle of the lower bridge conduction signal. A time between a rising edge of a waveform of the next cycle of the lower bridge conduction signal and the detection time point is equal to half the on-time.

Abstract: A porous film microfluidic device includes a sample well, a porous film support structure, including a first, second, and third port, wherein the first port is connected to the sample well, a porous film is formed over the bottom of the porous film support structure, and a glass fiber film is formed between the porous film support structure and the porous film, a waste tank connected to the second port of the porous film support structure, wherein a water absorption element is disposed in the waste tank, a buffer solution tank connected to the third port of the porous film support structure and sealed by a sealing film, and a COC plastic prism disposed over the bottom of the porous film support structure. The COC plastic prism includes a metal film in contact with the porous film and a metal oxide layer formed over the COC plastic prism.

Abstract: A porous film microfluidic device includes a sample well, a porous film support structure, including a first, second, and third port, wherein the first port is connected to the sample well, a porous film is formed over the bottom of the porous film support structure, and a glass fiber film is formed between the porous film support structure and the porous film, a waste tank connected to the second port of the porous film support structure, wherein a water absorption element is disposed in the waste tank, a buffer solution tank connected to the third port of the porous film support structure and sealed by a sealing film, and a COC plastic prism disposed over the bottom of the porous film support structure. The COC plastic prism includes a metal film in contact with the porous film and a metal oxide layer formed over the COC plastic prism.