High side power switch with charge pump and bootstrap capacitor
a high-side power switch and capacitor technology, applied in the field of power switches, can solve the problem that the maximum frequency of operation of intelligent power switches is limited to about 1 khz, and achieve the effect of high-speed switching operations
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[0012] With reference now to the drawings, FIG. 1 shows a circuit according to the present invention. All components, with the exception of the load and the capacitor CBS, can be integrated into an integrated circuit denominated IPS in FIG. 1. IPS is an abbreviation for “intelligent power switch”.
[0013] The circuit according to the present invention comprises a power switch 10 including a main power switching device Q1, typically driven by a driver circuit employing two transistors Q2 and Q3 in a half bridge arrangement. The gate of transistor Q1 is driven by the common node between transistors Q2 and Q3.
[0014] The drain of transistor Q1 is connected, in typical fashion to the voltage source VCC. The anode of a diode D1 is connected to the voltage source VCC in series with a resistor R. The other end of the resistor R is coupled to a bootstrap capacitor CBS. A second diode D2 has its anode coupled to the common junction of resistor R and capacitor CBS. The cathode of diode D2 is c...
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