| 摘要 |
An output stage with short-circuit protection includes a power transistor, a detecting module, a disable module, and a driving module. The power transistor is electrically connected between a voltage source and an output node. A gate end of the power transistor is configured to receive a driving signal. The detecting module is configured to detect an output voltage on the output node to determine whether a short-circuit condition occurs, and to provide a detecting signal according to the output voltage on the output node in the short-circuit condition. The disable module is configured to provide a disable signal according to the detecting signal in the short-circuit condition, and operatively stop the disable signal in each cycle period of a clock signal. The driving module is configured to determine whether to generate the driving signal according to the disable signal and the clock signal. |
| 主权项 |
1. An output stage with short-circuit protection comprising:
a power transistor comprising a first end, a second end, and a gate end, wherein the first end of the power transistor is electrically connected to a voltage source with a first reference voltage level, the second end of the power transistor is electrically connected to an output node, and the gate end of the power transistor is configured to receive a driving signal; a detecting module configured to detect an output voltage on the output node to determine whether a short-circuit condition occurs, and to provide a detecting signal according to the output voltage on the output node in the short-circuit condition, wherein the detecting module comprises: a current source configured to generate a first comparing current flowing through an operative node; and a current mirror configured to generate a second comparing current flowing through the operative node according to the output voltage on the output node, wherein the operative node is charged/discharged to an operative voltage level to serve as the detecting signal in a case that the first comparing current is greater than the second comparing current; a disable module configured to provide a disable signal according to the detecting signal in the short-circuit condition, and to operatively stop the disable signal in each cycle period of a clock signal; and a driving module configured to determine whether to generate the driving signal according to the disable signal and the clock signal. |
