Switching transducer driver circuitry
AssigneeCirrus Logic International Semiconductor Ltd.
InventorsJohn P. LESSO, Scott P. WARRICK, James T. DEAS
Life of this patent
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Abstract
Switching driver circuitry comprising: a first half-bridge configured to switch a first supply voltage having a first magnitude; a second half-bridge configured to switch a second supply voltage having a second magnitude, wherein the first magnitude is greater than the second magnitude; and an isolation switch coupled to the first and second half-bridges and operable to isolate the second half-bridge from the first half-bridge.
Claims34
Switching driver circuitry comprising:
- a first half-bridge configured to switch a first supply voltage having a first magnitude;
- a second half-bridge configured to switch a second supply voltage having a second magnitude, wherein the first magnitude is greater than the second magnitude;
- and
- an isolation switch coupled to the first and second half-bridges and operable to isolate the second half-bridge from the first half-bridge.
Switching driver circuitry comprising:
- a first half-bridge configured to switch a first supply voltage having a first magnitude;
- a second half-bridge configured to switch the first supply voltage;
- a third half-bridge configured to switch a second supply voltage having a second magnitude, wherein the first magnitude is greater than the second magnitude;
- a fourth half-bridge configured to switch the second supply voltage,
- a first isolation switch coupled to the first and third half-bridges and operable to isolate the third half-bridge from the first half-bridge;
- and
- a second isolation switch coupled to the second and fourth half-bridges and operable to isolate the fourth half-bridge from the second half-bridge.
The switching driver circuitry of claim 16, further comprising:
- first comparator circuitry configured to compare a first voltage at an output node of the first half-bridge to a first threshold and to prevent the first isolation switch from being switched on unless the voltage at the output node of the first half-bridge is below the first threshold;
- and
- second comparator circuitry configured to compare a second voltage at an output node of the second half-bridge to a second threshold and to prevent the second isolation switch from being switched on unless the second voltage at the output node of the second half-bridge is below the second threshold
An integrated circuit comprising:
- a low-power half-bridge comprising a high-side switch and a low-side switch coupled in series;
- and
- a half-bridge output terminal for coupling an output node of the low-power half-bridge to external high-power bridge circuitry,
- wherein the half-bridge is configured to switch a low-power supply voltage having a first magnitude.
A driver integrated circuit comprising:
- an internal half-bridge capable of switching a first voltage;
- a ground switch;
- and
- control circuitry,
- wherein the control circuitry is configured to control operation of the internal half-bridge, the ground switch and an external half-bridge that is capable of switching a second voltage of higher magnitude than the first voltage.
A driver integrated circuit comprising:
- a first internal half-bridge capable of switching a first voltage;
- a second internal half-bridge capable of switching a first voltage;
- and
- control circuitry,
- wherein the control circuitry is configured to control operation of the first and second internal half-bridges, and first and second external half-bridges that are capable of switching a second voltage of higher magnitude than the first voltage.
Dependencies are inferred from the claim text.