Switching power supply and power switch control circuit thereof
A power supply and power switch technology, applied in control/regulation systems, output power conversion devices, conversion of DC power input to DC power output, etc., can solve problems such as increasing the manufacturing cost of integrated circuit chip size, etc.
Active Publication Date: 2020-01-14
RICHTEK TECH
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Problems solved by technology
[0004] figure 1 The disadvantage of the prior art shown in , is that the primary-side control circuit 130 is, for example, an integrated circuit chip. In the power-on stage, a dedicated pin ASU is needed to control the power-on switch SSU, but this dedicated pin ASU is in Other stages have no function, thus increasing the manufacturing cost and the size of the IC chip
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[0036] The drawings in the present invention are all schematic and are mainly intended to show the coupling relationship between the circuits and the relationship between the signal waveforms. As for the circuits, signal waveforms and frequencies, they are not drawn to scale.
[0037] See Figure 2A The figure shows an embodiment of the switching power supply of the present invention (switching power supply 2A). The switching power supply 2A includes a power stage circuit 10, an auxiliary winding WA, a start switch SSU, and a power switch Control circuit 30. The power stage circuit 10 includes an inductor W1 and at least one power switch N1; wherein the power switch N1 is coupled to the inductor W1, and is used to operate according to the switch control signal GATE to control the conduction state of the inductor W1 and convert the input power to the output power supply. The input power includes an input voltage VIN and an input current (in this embodiment, the input current is e...
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A switching power supply and a power switch control circuit thereof are disclosed. The switching power supply includes a power stage circuit, an auxiliary winding, a start-up switch, and a power switch control circuit. The power switch controller circuit includes a multifunction pin, a start-up control circuit, and a feedback compensation circuit. The multifunction pin is coupled to a control terminal of the start-up switch, to deliver different signals with different functions under at least two different modes, respectively. The start-up control circuit generates a start-up signal in a start-up mode, wherein the start-up signal is delivered to a control terminal of the start-up switch through the multifunction pin. An output terminal of the feedback compensation circuit is coupled to themultifunction pin, to provide a compensation signal at the multifunction pin in an operation mode.
Description
Technical field [0001] The invention relates to a switching power supply, in particular to a switching power supply with shared pins to perform multiple functions. The invention also relates to a power switch control circuit used in a switching power supply. Background technique [0002] Applications related to this application include: US patent application US 2017 / 0005583 A1 and Chinese patent application CN106329961 A. [0003] figure 1 A prior art switching power supply (switching power supply 1) is shown. The switching power supply 1 includes a transformer 110, a rectifier circuit 120, a primary side control circuit 130, an auxiliary winding WA, and a start switch SSU. The auxiliary winding WA is coupled to the transformer 110 to generate the controller supply voltage VDD as the power supply of the primary side control circuit 130. In addition, during the power-up phase, that is, in the boot mode, when the controller supply voltage VDD is still lower than one When the power-...
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IPC IPC(8): H02M3/335H02M1/36
CPCH02M1/36H02M3/33553
Inventor 张宇文
Owner RICHTEK TECH