Frequency-configurable oscillator circuit applied to switching power supply
An oscillator and circuit technology, applied in the direction of electrical pulse generator circuits, logic circuits to generate pulses, electrical components, etc., can solve the problems of limited application scope of external devices, unfavorable internal loop stability, lack of inheritability and flexibility, etc.
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[0049] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0050] The present invention provides a frequency-configurable oscillator circuit applied to switching power supplies, which is an on-chip circuit for generating clock signal CLK and slope signal SLOPE, such as image 3 As shown, it includes a working mode recognition circuit 101, a charging current control circuit 102, a delay circuit 103, a synchronization module 104, and an internal oscillator 105. Three working modes can be realized through external configuration, including fixed frequency mode, adjustable frequency mode, and external Frequency synchronization mode.
[0051] The charging current control circuit 102 judges whether the RT terminal of the external resistor is floating, and sends the resistor floating signal RT_FLOATING to the working mode recognition circuit 101. The input signal SYNC and the resistance floating signal s...
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