Soft startup circuit of switch power supply and its startup method
A technology of soft start circuit and switching power supply, which is applied in the direction of electrical components, adjusting electric variables, output power conversion devices, etc. It can solve the problems of large peak current and rise, and achieve the effect of avoiding peak current
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[0014] The above-mentioned and other objects and features of the present invention will become clearer through the following description in conjunction with the accompanying drawings exemplarily showing an example.
[0015] Such as image 3 As shown, the switching power supply 300 of the present invention is used to convert a first power supply VPP (for example, 3V) into a second power supply VPPO output, which includes a control unit 301, a switching unit PSD, a bias circuit 303, and a voltage drop control Unit 306. In this embodiment, the switch unit PSD is realized by a PMOS transistor. The control unit 301 is used for outputting a first bias signal Nbias, a second bias signal Pbias, a pulse signal CPDN and a switch control signal VG according to an external clock CLK and a soft start enable signal EN. Wherein, the first bias signal Nbias and the second bias signal Pbias are both current mirror bias signals. The initial value of the switch control signal VG is high, and its pot...
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