| 主权项 |
1. A voltage comparator for use in a power converter controller, comprising:
an amplifier coupled to receive an input signal at an amplifier input and generate an output signal at an amplifier output in response to the input signal, the amplifier including:
a current generation circuit coupled to generate a first current and a second current, wherein a ratio of the first current to the second current is substantially constant, the first current to flow through a first branch and the second current to flow through a second branch;a first transistor having a first terminal, a second terminal, and a first control terminal, wherein the first terminal is coupled to the amplifier input and the second terminal is coupled to the first branch and to the first control terminal;a second transistor having a third terminal, a fourth terminal, and a second control terminal, wherein the second control terminal is coupled to the first control terminal, the third terminal is coupled to the second branch, and the fourth terminal is coupled to a reference voltage; andan anti-saturation circuit coupled between the first branch and the second branch to prevent saturation of the second transistor in response to the input signal reaching a first threshold voltage; and an output circuit coupled to the amplifier output to generate a comparator output signal in response to the output signal, wherein the amplifier output is coupled to the second branch. |
