| 摘要 |
A current sensing circuit is coupled to a current amplifier. The current sensing circuit comprises a power MOS, a switch and a switching resistor. The switching resistor has a value of ranging from approximately some kiliohms to approximately several ten kiliohms. The power MOS outputs a large current. The switch determines a sensing period. The power MOS provides a low on-resistance characteristic such that a sensing resistor is capable of being eliminated. The switching resistor senses a voltage drop while the switch is turned on. The sensed voltage is amplified by the current amplifier. The switching resistor has a relatively low accuracy resistance.
|
