摘要:
The present invention discloses an anti-ringing switching regulator, comprising a variable resistor, a transistor, and an inductor electrically connected to a common node, in which the variable resistor is electrically connected with an input voltage, the transistor is electrically connected to ground, and the inductor is electrically connected to an output terminal, whereby the input voltage is converted and transmitted to the output terminal according to the resistance variation of the variable resistor and the switching of the transistor.
摘要:
The present invention discloses an anti-ringing switching regulator, comprising a variable resistor, a transistor, and an inductor electrically connected to a common node, in which the variable resistor is electrically connected with an input voltage, the transistor is electrically connected to ground, and the inductor is electrically connected to an output terminal, whereby the input voltage is converted and transmitted to the output terminal according to the resistance variation of the variable resistor and the switching of the transistor.
摘要:
A multi-channel regulator system includes serially connected PWM integrated circuits, each of which determines a PWM signal for a respective channel to operate therewith, and individually controls its operation mode according to whether or not an external clock is detected. Therefore, each channel will not be limited to operate under a constant mode and could become a master channel or a slave channel. Additionally, each of the PWM integrated circuits generates a phase shifted synchronous clock for its next channel during it is enabled, and thus all the channels operate in a synchronous but phase interleaving manner.
摘要:
The present invention discloses a circuit and a method for controlling a light emitting device, and an integrated circuit therefore. The circuit for controlling a light emitting device comprises: a power stage controller circuit controlling a power stage circuit to convert an input voltage to an output voltage, which is supplied to at least one light emitting device channel including at least one light emitting device; a transistor switch in the light emitting device channel; and a current source circuit controlling a current through the light emitting device channel, wherein the power stage controller circuit and the current source circuit are integrated in an integrated circuit which provides a control voltage to control a gate of the transistor switch.
摘要:
A ramp generator is provided to provide a multi-slope ramp signal for a PWM power converter. The ramp generator determines the slope turning points for the multi-slope ramp signal according to the error signal of the PWM power converter and thereby improve the transient response of the PWM power converter. Preferably, the slope turning point of the multi-slope ramp signal varies with the average of the error signal and is thus adaptive to the error signal and thereby the load condition.
摘要:
The present invention discloses a digital dimming device and a digital dimming method, for controlling a plurality of light emitting device channels. The method comprises: generating a corresponding plurality of driving signals to control the plurality of light emitting device channels; receiving a PWM input signal having a duty ratio, and phase shifting the PWM input signal to generate multiple PWM output signals with about the same duty ratio as the PWM input signal, but with respectively shifted phases; and enabling or disabling corresponding driving signals by the multiple PWM output signals, respectively.
摘要:
The present invention discloses a circuit and a method for controlling a light emitting device, and an integrated circuit therefore. The circuit for controlling a light emitting device comprises: a power stage controller circuit controlling a power stage circuit to convert an input voltage to an output voltage, which is supplied to at least one light emitting device channel including at least one light emitting device; a transistor switch in the light emitting device channel; and a current source circuit controlling a current through the light emitting device channel, wherein the power stage controller circuit and the current source circuit are integrated in an integrated circuit which provides a control voltage to control a gate of the transistor switch.
摘要:
A level shift circuit includes an input stage and an output stage coupled to each other by two nodes. The input stage changes the voltages on the nodes according to an input signal, and the output stage determines an output signal according to the voltages on the two nodes. In a transition state, the input stage provides a large current to charge or discharge the first node or the second node so as to quickly change the voltage thereon. In a steady state, the input stage lowers the current so as to reduce power consumption.
摘要:
The present invention discloses a level shift circuit which comprises: level shift means for receiving an input of a first operational voltage and generating an output of a second operational voltage; and a current path connecting with a source of the second operational voltage and providing current to the output of the level shift means to speed up output level switching. The circuit preferably further comprises a power consumption control circuit for stopping excess power consumption when the output of the level shift means has substantially accomplished level switching.
摘要:
The present invention provides a regulator used in an active terminator of a bus. The regulator comprises a voltage-regulated terminal, a first operational amplifier and a non-inverting input terminal thereof coupled to a reference voltage. An inverting input terminal of a second operational amplifier is coupled to the reference voltage. A control gate of a first transistor is coupled to an output terminal of the first operational amplifier. A source of the first transistor is coupled to an inverting input terminal of the first operational amplifier to form a feedback network and to provide a stable circuit of sourcing current. A control gate of a second transistor is coupled to an output terminal of the second operational amplifier and a drain of the second transistor to a non-inverting input terminal of the second operational amplifier to form the feedback network and to provide a stable circuit of sinking current. The prevent invention prevents from utility of complementary output power transistors and shoot-through current.