Timer circuit used for COT control mode switching adjustor
A timer circuit and switching regulator technology, applied in the field of electronics, can solve the problems of EMI dispersion, insufficient precision and linearity, etc.
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[0012] The specific embodiment of the present invention is described below in conjunction with accompanying drawing
[0013] like figure 2 As shown, it is a schematic diagram of the circuit structure of the switching regulator timing module of the COT control mode of the present invention, and the circuit includes a proportional current generation unit, a high-precision frequency adjustment unit, a current operation unit and a counter unit connected in sequence; wherein, the proportional current The generating unit is composed of PMOS transistor MP1, transistors Q1 and Q2, and resistor R1; among them, the source of MP1 is connected to the power supply VDD, its gate and drain are interconnected, its gate is connected to the gate of MP2, and its drain is connected to Q1. The collector; the base of Q1 is connected to VB (VB is a fixed bias voltage to ensure the normal operation of Q1), and its emitter is grounded to VSS through R1; the source of MP2 is connected to the power sup...
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