Arrangement for reducing the effects of capacitive coupling in a

Details Arrangement for reducing the effects of capacitive coupling in a Arrangement for reducing the effects of capacitive coupling in a

1998-02-03

2000-01-04

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 94, G11C 2702

Patent

active

060114142

ABSTRACT:
In a switched-mode power supply, when the controller and the switching device are encapsulated together with a heat sink, in which the drain of the switching device is connected to the heat sink, the heat sink and the paths to the various pins of the controller forms various parasitic capacitances which, when the switching device switches injects inordinately large currents into the pins of the controller. In the case of the D.sub.MAG input, this may result in throwing the switched-mode power supply out of regulation. The sample-and-hold circuit connected to the D.sub.MAG input includes an additional comparator for comparing the current on the D.sub.MAG input to an extra large current. If the current on the D.sub.MAG input exceeds this extra large current, the sampling switch of the sample-and-hold circuit is held open while a clamp circuit is engaged on the D.sub.MAG input.

REFERENCES:
patent: 5453921 (1995-09-01), Shutts
patent: 5498995 (1996-03-01), Szepesi et al.
patent: 5646520 (1997-07-01), Frank et al.
patent: 5650715 (1997-07-01), Massie
patent: 5874841 (1999-02-01), Majid et al.

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