Driver circuit having preslewing circuitry for improved slew rat

Details Driver circuit having preslewing circuitry for improved slew rat Driver circuit having preslewing circuitry for improved slew rat

1998-03-31

1999-08-17

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327170, H03B 100

Patent

active

059399090

ABSTRACT:
A driver circuit for a power device of a power driving stage is capable of providing slew rate control. The driver circuit includes the following elements: a charging source of current, a discharging source of current, a first switch, a second switch, a conductive device, a capacitive element, an amplifier, and the power device. Both the first and second switches receive a control signal. The elements of the driver circuit are configured such that the conductive device will conduct only when the following two conditions are met: the control signal is a certain logic level and the voltage generated by the amplifier is larger than a reference voltage. When the control signal transitions from a first to a second logic state, a charging current is delivered to the capacitive element, an output voltage of the driver circuit increased to the reference voltage, and a voltage on a control terminal of the power device also increases to a charge pump voltage level. When the control signal transitions from the second to the first logic state, the conductive device conducts as long as the output voltage generated by the power device is larger than the reference voltage and the discharging source of current operates to quickly discharge the capacitive element so that the voltage at the node at the input terminal of the amplifier is quickly reduced until it approximates the reference voltage.

REFERENCES:
patent: 5742193 (1998-04-01), Colli et al
patent: 5828245 (1998-10-01), Brambilla et al.

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