Method to improve the peak-current limit in a slope-compensated,

Details Method to improve the peak-current limit in a slope-compensated, Method to improve the peak-current limit in a slope-compensated,

1996-02-16

1998-02-10

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323286, H02M 3335, G05F 146

Patent

active

057173222

ABSTRACT:
A method and circuit for modifying the clamping level (VCLAMP) of the error signal voltage (VERROR), which clamp in turn limits the peak current in the inductor of a slope-compensated, current mode DC/DC converter. VCLAMP may be modified and/or variable such that it is a function of average current in the inductor, peak current in the inductor, the converter duty cycle and/or the level of slope compensation used in the converter. The modification of VCLAMP may result in the peak current limit being independent of the converter duty cycle and/or the level of slope compensation used in the converter. Further, the modification of VCLAMP does not compromise the operational stability of the converter which is achieved by the use of a slope compensation. In addition, the clamping of the error signal before slope compensation rather than after slope compensation avoids instability at high duty cycles.

REFERENCES:
patent: 4772996 (1988-09-01), Hanei et al.
patent: 4837495 (1989-06-01), Zansky
patent: 4866588 (1989-09-01), Rene

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