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一种新颖的滞环控制电路
王平
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A Novel Hysteretic Control Circuit
The use of hysteretic control for current regulators is very applicable to LED drivers.
It is easy to sense the current in the FET but this is comprised of only the positive ramp.
The FET current waveform makes it simple to turn the switch off at the correct peak
value of drain current; however, the information from the negative ramp is not available
in the path of the FET. This paper examines a novel method of synthesizing the
information from the positive ramp, to determine the correct off-time required to hold the
valley current constant. This technique allows for a simple integrated circuit to be
manufactured with all of the advantages of hysteretic control, and a very simple current
sensing circuit.
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