Working size switching circuit for power transistors in DC-DC converter
A technology of DC-DC and switching circuits, applied in the direction of DC power input conversion to DC power output, output power conversion devices, instruments, etc., can solve the problems of low efficiency, large charge and discharge loss, etc., to improve consistency, reduce Small power consumption, the effect of improving light load efficiency
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[0019] The present invention will be further described below in conjunction with accompanying drawings and embodiments thereof.
[0020] refer to figure 2 , the current mode DC-DC converter using the power tube working size switching circuit of the present invention includes: a power tube size adjusting circuit, an output LC filter 7, a feedback network 8, an error amplification module 9, a slope compensation signal and a current sampling signal. The slope compensation signal and the current sampling signal are respectively generated by the oscillation module and the current sampling module inside the chip, and these two modules are not shown in the figure.
[0021] The power tube working size switching circuit of the present invention includes: a pulse width modulation PWM comparison module 1, a first drive module 3, a first pair of power MOS tubes 5, a hysteresis comparison module 2, a second drive module 4 and a second pair of power MOS tubes 6. The output terminal of th...
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