CONTROL CIRCUIT HAVING ERROR AMPLIFIER FOR DC-DC CONVERTER AND CONTROL METHOD THEREFOR
First Claim
1. A control circuit for DC-DC converters, comprising:
- an error amplifier that has an inverting input terminal to which detecting voltage detected according to output voltage is inputted and a non-inverting input terminal to which reference voltage is inputted, and amplifies the voltage difference of the detecting voltage relative to the reference voltage; and
a detection unit that detects that an error output signal of the error amplifier stays at a predetermined voltage level, the detection unit having a signal determination unit that detects that the predetermined voltage level is out of a normal operating range, and a duration count unit that detects that the predetermined voltage level continuously stays out of the normal operating range for a predetermined time by the signal determination unit.
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0 Petitions
Accused Products
Abstract
A control circuit for DC-DC converters and a control method therefor wherein unstable operation in which output voltage fluctuates can be detected and the unstable operation be prevented from continuing are provided. The control circuit includes: an error amplifier ERA1 that has an inverting input terminal to which detecting voltage V1 detected according to output voltage is inputted and a non-inverting input terminal to which reference voltage e1 is inputted, and amplifies the difference voltage of detecting voltage relative to reference voltage e1; and a detection unit 50 that detects that an error output signal VOP of the error amplifier ERA1 stays at a predetermined voltage level. The detection unit 50 includes: a signal determination unit that determines that the predetermined voltage level is out of a normal operating range; and a duration count unit that detects that the predetermined voltage level stays out of the normal operating range for a predetermined time by the signal determination unit.
6 Citations
10 Claims
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1. A control circuit for DC-DC converters, comprising:
- an error amplifier that has an inverting input terminal to which detecting voltage detected according to output voltage is inputted and a non-inverting input terminal to which reference voltage is inputted, and amplifies the voltage difference of the detecting voltage relative to the reference voltage; and
a detection unit that detects that an error output signal of the error amplifier stays at a predetermined voltage level, the detection unit having a signal determination unit that detects that the predetermined voltage level is out of a normal operating range, and a duration count unit that detects that the predetermined voltage level continuously stays out of the normal operating range for a predetermined time by the signal determination unit. - View Dependent Claims (3, 4, 5)
- an error amplifier that has an inverting input terminal to which detecting voltage detected according to output voltage is inputted and a non-inverting input terminal to which reference voltage is inputted, and amplifies the voltage difference of the detecting voltage relative to the reference voltage; and
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2. (canceled)
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6. A control method for DC-DC converters,
wherein, after detecting voltage detected according to output voltage is compared with reference voltage, an error output signal obtained by amplifying the difference voltage of the detecting voltage relative to the reference voltage is outputted, and wherein it is detected that the error output signal stays at a predetermined voltage level, it is determined that the predetermined voltage level is out of a normal operating range, and it is detected that the predetermined voltage level is continuously out of the normal operating range for a predetermined time.
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7. (canceled)
Specification