Bootstrap driver
First Claim
1. A bootstrap driver, comprising:
- an output stage having an N-type high-side transistor and an N-type low-side transistor, which are arranged in series between a positive supply terminal and a negative supply terminal, an output of the driver being tapped from a common node between these transistors;
a first control circuit for controlling the high-side transistor and a second control circuit for controlling the low-side transistor;
a first voltage regulator having an output delivering a first supply voltage for said first control circuit, and a second voltage regulator having an output delivering a second supply voltage for said second control circuit, said first and second voltage regulators being mutually independent;
a bootstrap capacitance arranged between the output of the driver and a boost-voltage node;
a bootstrap diode having an anode connected to the output of the first voltage regulator and a cathode connected to the boost-voltage node; and
a recovery diode having an anode connected to the output of the first voltage regulator and a cathode connected to the positive supply terminal, in order to conduct a reverse current of the bootstrap diode when the output of the driver switches from a low state, wherein the low-side transistor is on and the high-side transistor is off, to a high state wherein the low-side transistor is off and the high-side transistor is on.
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Accused Products
Abstract
A bootstrap driver comprises an output stage having an N-type high-side transistor and a low-side transistor, also of the N-type, which are arranged in series between a positive supply terminal and a negative supply terminal. A control circuit of the high-side transistor and a control circuit of the low-side transistor are respectively supplied by a first voltage regulator and a second voltage regulator, which are mutually independent. A recovery diode is connected by its anode to the output of the first voltage regulator and by its cathode to the positive supply terminal, in order to conduct the reverse current of a bootstrap diode when the output of the circuit switches from a low state to a high state.
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Citations
23 Claims
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1. A bootstrap driver, comprising:
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an output stage having an N-type high-side transistor and an N-type low-side transistor, which are arranged in series between a positive supply terminal and a negative supply terminal, an output of the driver being tapped from a common node between these transistors;
a first control circuit for controlling the high-side transistor and a second control circuit for controlling the low-side transistor;
a first voltage regulator having an output delivering a first supply voltage for said first control circuit, and a second voltage regulator having an output delivering a second supply voltage for said second control circuit, said first and second voltage regulators being mutually independent;
a bootstrap capacitance arranged between the output of the driver and a boost-voltage node;
a bootstrap diode having an anode connected to the output of the first voltage regulator and a cathode connected to the boost-voltage node; and
a recovery diode having an anode connected to the output of the first voltage regulator and a cathode connected to the positive supply terminal, in order to conduct a reverse current of the bootstrap diode when the output of the driver switches from a low state, wherein the low-side transistor is on and the high-side transistor is off, to a high state wherein the low-side transistor is off and the high-side transistor is on. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A bootstrap driver, comprising:
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an output stage having a high-side transistor and a low-side transistor, arranged in series between a positive supply terminal and a negative supply terminal, an output of the driver being tapped from a common node between these transistors;
a first control circuit for controlling the high-side transistor and a second control circuit for controlling the low-side transistor;
a bootstrap capacitance arranged between the output of the driver and a supply input of the first control circuit;
a bootstrap diode having an anode, and a cathode connected to a supply input of the first control circuit;
a first voltage regulator having an output coupled to the anode of the bootstrap diode and structured to deliver a first supply voltage to the supply input of first control circuit via the bootstrap diode; and
a second voltage regulator having an output delivering a second supply voltage to the supply input of the second control circuit. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A bootstrap driver, comprising:
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an output stage having a high-side transistor connected between a positive supply terminal and an output of the driver and a low-side transistor connected between the output of the driver and a negative supply terminal;
a first control circuit for controlling the high-side transistor and a second control circuit for controlling the low-side transistor;
a bootstrap capacitance arranged between the output of the driver and a supply input of the first control circuit;
a bootstrap diode having an anode, and a cathode connected to a supply input of the first control circuit;
a first voltage regulator having an output coupled to the anode of the bootstrap diode and structured to deliver a first supply voltage to the supply input of first control circuit via the bootstrap diode; and
a recovery diode having an anode connected to the output of the first voltage regulator and a cathode connected to the positive supply terminal. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification