Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Generating sawtooth or triangular output
Patent
1996-08-19
1997-09-02
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Generating sawtooth or triangular output
327380, 327427, 327312, 327 73, 327110, H03K 17687, H03K 301
Patent
active
056636679
ABSTRACT:
A method and circuit for reducing the leading edge spike in a current sense signal. The current sense signal is a measure of the current through a switched power device controlled by a switching regulator controller. The slew rate of the current sense signal is limited to prevent the slew rate from exceeding a predetermined maximum. The limited slew rate signal is provided to the switching regulator controller. A transconductance amplifier may be used to limit the slew rate of the current sense signal. A capacitor at the output of the transconductance amplifier contributes to controlling the maximum slew rate of the amplifier. The capacitor is charged by the current output of the amplifier to provide a voltage signal for use in place of the original current sense signal. A switch may be provided for selecting between the slew rate limited current sense signal and the original current sense signal. A time delay may be used to control the switch so that the slew rate limiting is replaced by the original current sense signal after a first predetermined time portion of each "on cycle" of the switched power device.
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Blum Gregory A.
Levin Gedaly
Callahan Timothy P.
Cherry Semiconductor Corporation
Shin Eunja
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