摘要 |
An amplifier having output switch circuitry (106, 108) is described. A sense resistor (Rs) is operable to transmit an output current associated with the output switch circuitry (106, 108). Low-voltage circuitry (104) is operable to provide a drive signal to the output switch circuitry (106, 108). Isolation circuitry (Cc) is operable to provide DC isolation between the low-voltage circuitry (104) and the output switch circuitry (106, 108). Current sensing circuitry (120, 122, 124, 126) is directly connected to the sense resistor (Rs) and is operable to sense the output current in the sense resistor (Rs) and generate a fault signal (fault) in response to an overcurrent condition. The fault signal is characterized by a signal level which is compatible with the low-voltage circuitry (104) without additional DC isolation. |