Switching type multi-power management circuit with extremely low power consumption
A technology for managing circuits and power switch tubes, which is applied in electrical components, output power conversion devices, and irreversible AC power input to DC power output, etc., to ensure high efficiency and stable and reliable operation.
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[0014] figure 1 A typical block diagram of an existing scheme. This scheme realizes the typical application of LED driving by the power management IC. The scheme consists of a step-down device 1, an operational amplifier OP 2, a control module controller 3, a resistor network module Rnet 4, a power switch tube 5, a diode 6, an inductor 7, a capacitor 8, an LED lamp 9, an AC input 10, and a full-bridge rectifier 11 12 are composed of chip power supply capacitors.
[0015] In the existing solution, the high-voltage input charges the chip power supply capacitor 12 through the step-down device 1 to generate the internal power supply VCC of the chip. After VCC is divided by the resistor network Rnet 4, it is compared with the chip reference voltage through the operational amplifier OP 2, and the comparison result is input to the step-down device to adjust the flowing current value, and finally adjust the voltage value of the capacitor 12. The power supply mode of the existing so...
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