Circuit to improve the transient response of step-down DC to DC

Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...

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323284, G05F 1618

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active

056708653

ABSTRACT:
A transient response circuit for a step-down DC to DC converter having a DC input and a DC output. The transient response circuit includes a high pass filter (24) for detecting transients at the DC output of the DC to DC converter, a first comparator (31) responsive to the high pass filter for providing a first comparator output that is active when the high pass filter detects a negative transient that is less than a first threshold voltage, a second comparator (32) responsive to the high pass filter for providing a second comparator output that is active when the high pass filter detects a positive transient that is greater than a second threshold voltage, a first switching circuit (41, 43) responsive to the first comparator for providing a current path between the input of the DC to DC converter and the output of the DC to DC converter when the first comparator output is active, and a second switching circuit (42, 45) responsive to the second comparator for providing a current path between the output of the DC to DC converter and a ground reference potential when the second comparator output is active.

REFERENCES:
patent: 4618812 (1986-10-01), Kawakami
patent: 4709322 (1987-11-01), Mirow
patent: 5375029 (1994-12-01), Fukunaga et al.

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