Switching regulator
AssigneeSeiko Instruments Inc.
InventorToshiki Ishii
Life of this patent
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Abstract
The present invention provides a short-circuit protecting circuit of a switching regulator which does not require a capacitor having a large capacity in order to obtain a sufficient duty time. A pulse generating circuit for generating one clock with a short-circuit detection signal as a trigger signal is added, and a counter circuit for counting clock pulses of a clock signal is further inserted between a comparator and a latch circuit, whereby it becomes possible to produce a sufficient delay time based on a signal having a short period using a capacitor having a small capacity.
Claims5
A switching regulator having a short-circuit protecting circuit, the short-circuit protecting circuit comprising:
- a short-circuit state detecting circuit;
- a delay circuit for delaying an output from the short-circuit state detecting circuit;
- a pulse generating circuit for generating a pulse in response to an output from the delay circuit;
- a counter circuit for counting pulses from the pulse generating circuit;
- and
- a latch circuit for latching an output from the counter circuit to output the latched output as a short-circuit signal.
Dependencies are inferred from the claim text.