Miscellaneous active electrical nonlinear devices – circuits – and – Gating
Patent
1995-06-07
1997-08-12
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Gating
327377, H03K 1700
Patent
active
056569653
ABSTRACT:
Circuits and methods are provide for improving the turn-off switching speed of a high-speed integrated circuit, bipolar switching regulator. The regulator runs at megahertz frequencies, yet is efficient as previously available bipolar integrated circuit switching regulators operating at much lower frequencies. The turn-off circuitry increases the speed at which the switch turns off by momentarily providing additional current to boost the base discharge current during the on-to-off transition period of the switch. In a preferred embodiment, the circuitry includes a capacitor for storing a charge, a resistor for limiting the amount of additional current provided, and a diode for delivering the additional current to the base of an NPN transistor, the collector of which is coupled to the switch's base, for boosting that transistors collector current and the switch's base discharge current. The diode then blocks current during the off-to-on transition period of the switch. Thus, the turn-off circuitry operates on an AC basis and only when the switch is turning off.
REFERENCES:
patent: 4331886 (1982-05-01), Perner et al.
patent: 4331887 (1982-05-01), Jadus et al.
patent: 4677324 (1987-06-01), Ronan, Jr. et al.
patent: 4755741 (1988-07-01), Nelson
patent: 4823070 (1989-04-01), Nelson
patent: 5218243 (1993-06-01), Keown et al.
"LT1070/LT1071: 5A and 2.5A High Efficiency Switching Regulators," Linear Technology Data Sheet, Linear Technology Corporation, Milpitas, California, Apr. 1989, pp. 1-12.
"LT1074/LT1076: Step-Down Switching Regulator," Linear Technology Data Sheet, Linear Technology Corporation, Milpitas, California, Jun. 1991, pp. 1-16.
"LT1070 Design Manual," Linear Technology Application Note 19, by C. Nelson, Linear Technology Corporation, Milpitas, California, Jun. 1986, pp. 1-76.
"LT1074/LT1076 Design Manual," Linear Technology Application Note 44, by C. Nelson, Linear Technology Corporation, Milpitas, California, Sep. 1991, pp. 1-48.
Essaff Robert
Nelson Carl T.
Callahan Timothy P.
Linear Technology Corporation
Morris Robert W.
Tuma Garry J.
Zweizig Jeffrey
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