Switching power supply source

Abstract

A switching power supply source including an inductance with first and second terminals; an output node; an NMos transistor, the drain of which is connected to the first terminal; a PMos transistor, the drain of which is connected to the first terminal; a control device generating control signals for NMos and PMos transistors assuring that these transistors are not conducting simultaneously; a capacitor with a third terminal connected to the first terminal and a fourth terminal; a resistance with a fifth terminal connected to the fourth terminal and a sixth terminal; and an NMos transistor the drain of which is connected to the grid of the PMos transistor and the gate of which is connected to the fourth terminal.

1 . Switching power supply source comprising: 
 an inductance with first and second terminals;    an output node;    an NMos transistor, a source of which is connected to a ground and the drain of which is connected to a first terminal of the inductance;    a PMos transistor, a drain of which is connected to the first terminal of the inductance;    a switching power supply control device generating switching control signals for NMos and PMos transistors capable of assuring that these transistors are not conducting simultaneously;    a capacitor with a first terminal connected to the first terminal of the inductance and a second terminal;    a resistance with a first terminal connected to the second terminal of the capacitor and a second terminal connected to the ground; and    a detection NMos transistor, a source of which is connected to the ground, a drain of which is connected to a gate of the PMos transistor, and a gate of which is connected to the second terminal of the capacitor.    
   
   
       2 . Switching power supply source according to  claim 1 , wherein the second terminal of the inductance is connected to a DC power supply source; 
 the source of the PMos transistor is connected to the output node.    
   
   
       3 . Switching power supply source according to  claim 2 , further comprising at least one other output node and at least one other PMos transistor, a drain of which is connected to the first electrode of the inductance, a source of which is connected to the other output node and the gate of which is connected to the drain of the detection NMos transistor.  
   
   
       4 . Switching power supply source according to  claim 1 , further comprising: 
 a blocking transistor with a first electrode connected to the ground, a second electrode connected to the gate of the detection NMos transistor and a control electrode;    the switching power supply control device making the blocking transistor conducting when the detection NMos transistor is conducting.    
   
   
       5 . Switching power supply source according to  claim 4 , further comprising: 
 also comprising a control transistor with a first electrode connected to the ground, a second electrode connected to the gate of the PMos transistor and a control electrode;    the switching power supply control device controlling simultaneous conduction of the control transistor and the blocking transistor.    
   
   
       6 . Switching power supply source according to  claim 1 , wherein the transistors, the capacitor and the resistance are integrated on the same substrate.