초록 ▼

A high current driver (100) for driving a high current load (110) in an electronic device powered by a battery (112) comprises a voltage reference (104) for generating a reference voltage, and a drive current controller (102, 302) responsive to a drive control signal for selectively switching the dr

A high current driver (100) for driving a high current load (110) in an electronic device powered by a battery (112) comprises a voltage reference (104) for generating a reference voltage, and a drive current controller (102, 302) responsive to a drive control signal for selectively switching the drive current controller (102, 302) from an active state for supplying current to the high current load (110), to an-inactive state for inhibiting the supply of current to the high current load (110). The drive current controller (102, 302) further controls the amount of current supplied to the high current load (110) when the battery (112) terminal voltage is substantially equal to the reference voltage. A load control element (108) is coupled to the drive current controller (102, 302) and drives the high current load (110) when the drive current controller (102, 302) is in the active state.

대표청구항 ▼

A high current driver for driving a high current load in an electronic device powered by a battery having a terminal voltage which varies substantially in relation to a level of energy being consumed from the battery, said high current driver comprising: a voltage reference generating a predetermine

A high current driver for driving a high current load in an electronic device powered by a battery having a terminal voltage which varies substantially in relation to a level of energy being consumed from the battery, said high current driver comprising: a voltage reference generating a predetermined reference voltage; a differential amplifier, having a bias control input, responsive to a bias control signal, for selectively switching said differential amplifier from an active state for providing a supply of current to the high current load, to an inactive state for inhibiting the supply of current to the high current load, said differential amplifier further having a first input, coupled to said voltage reference, and a second input coupled to the battery, said differential amplifier sensing a magnitude of the terminal voltage of the battery during the active state, and in response thereto, generating a drive control signal for proportionally reducing the current supplied to the high current load when the magnitude of the terminal voltage of the battery sensed is substantially equal to a predetermined voltage level; and a load control element, coupled to said differential amplifier, and responsive to the drive control signal for supplying current to the high current load when the differential amplifier is in the active state and the magnitude of the battery terminal voltage is greater than the predetermined voltage level, and further for proportionally reducing the supply of current to the high current load when the differential amplifier is in the active state and the magnitude of the battery terminal voltage is substantially equal to the predetermined voltage level.