Pwm switching regulator control circuit

A switching voltage regulator and control circuit technology, applied in circuit devices, control/regulation systems, emergency protection circuit devices, etc., can solve the problems of increasing ripple voltage and reducing output voltage, so as to prevent output voltage drop, ripple The effect of small wave voltage
CN1578085AInactive Publication Date: 2005-02-09SEIKO INSTR INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SEIKO INSTR INC
Publication Date
2005-02-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

Provided is a PWM switching regulator control circuit, which is small in the ripple voltage without a drop of the output voltage which, is attributable to a load at the time of a soft start. A PWM switching regulator control circuit is provided, in which an offset voltage that is lower than a reference voltage is inputted to an error amplifier at the time of a soft start, to thereby prevent an off-time from occurring in the PWM comparator output, prevent the output voltage that is attributable to the load from dropping, and make the ripple voltage small.
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Description

technical field

[0001] The invention relates to a PWM switching regulator control circuit with soft start function. Background technique

[0002] In order to suppress the inrush current or the overshoot of the output voltage when the power is turned on, some PWM switching regulator control circuits provide a soft-start function. Refer to Figure 2 and image 3 , the operation of the conventional soft-start function will be described sequentially from when no supply voltage is present at all.

[0003] First, when the power supply is connected to the PWM switching regulator control circuit, the output voltage VOUT rises from 0V, the current flows from the constant current source 206 into the capacitor 207, and the gate voltage of the n-channel MOS transistor 204 gradually rises. As a result, since the voltage VREF of the reference voltage 203 slowly rises the voltage at the non-inverting input terminal of the error amplifier 208, the rush current and the overshoot of the outpu...

Claims

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