Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Patent
1994-04-15
1997-09-30
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
327374, H03B 100
Patent
active
056729880
ABSTRACT:
A drive circuit for a high-speed integrated circuit, bipolar switching regulator is disclosed. The circuit runs at megahertz frequencies, yet is efficient as previously available bipolar integrated circuit switching regulators operating at much lower frequencies. The circuitry provides three switch drive currents: a first (nominal) current that is provided while the switch is off in order to conserve power; a second (boosted) current, provided while the switch is transitioning from off to on in order to increase the speed at which the switching element switches on; and a third (drive) current, provided after the switch has turned on for maintaining the switch at a desired point in saturation. The drive current, additionally, varies as a function of the load on the switch in order, again, to conserve power. Additional circuitry increases the speed at which the switch turns off, by momentarily boosting base discharge current during the on-to-off transition period of the switch. The circuitry also increases speed by enabling the drive current prior to switch turn on. The circuitry can regulate both positive and negative outputs using a common error amplifier, as well as providing a multifunction node for shutdown and synchronization. Additionally, the circuitry provides improved recovery from output overshoot conditions. An improved clamp, to prevent the switch from spending too much time in a high power state (which would slow the switch down), increases the stability of the switch as compared with previously known designs.
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Essaff Robert
Nelson Carl T.
Callahan Timothy P.
Linear Technology Corporation
Morris Robert W.
Rogers Laurence S.
Zweizig Jeffrey
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