Pulse-width modulation controller for switching voltage stabilizer

A pulse width modulation and controller technology, which is applied in the direction of output power conversion devices, electrical components, etc., and can solve problems such as adding external components.

Inactive Publication Date: 2009-02-25
NIKO SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Similarly, due to the need for a larger charging time constant, a larger value of the resistor 221 and capacitor 222 is required. Generally, the capacitor 222 is externally connected in existing applications to save chip area, but this also increases external components. and the number of package pins

Method used

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  • Pulse-width modulation controller for switching voltage stabilizer
  • Pulse-width modulation controller for switching voltage stabilizer
  • Pulse-width modulation controller for switching voltage stabilizer

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Embodiment Construction

[0018] In order to make the above-mentioned and other objects, features and advantages of the present invention more obvious and understandable, the preferred embodiments of the present invention will be specifically cited below, together with the accompanying drawings, for detailed description as follows:

[0019] The invention adopts the transconductance amplifier as the error amplifier, and controls the output current of the transconductance amplifier at the beginning of the start-up of the switching voltage regulator so that the output current rises slowly, and then slowly charges the compensation load. In this way, the duty cycle of the PWM output signal of the PWM comparator can be increased flexibly, so as to prevent the switching regulator from outputting overvoltage and overcurrent at the beginning of start-up and damaging the switching power components.

[0020] The following describes in detail the soft start method of the present invention applied to the switching r...

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Abstract

The invention discloses a PWM controller applied to a switching type voltage stabilizer, which comprises an error amplifier, a soft-start control circuit, a compensation load and a comparator, wherein, the error amplifier receives a voltage reference and a feedback voltage and outputs an error current signal hereby; the soft-start control circuit outputs a compensating current signal according to at least a soft-start control signal; the compensation load receives the error current signal and the compensating current signal and outputs a compensating signal; the comparator receives a ramp signal and the compensating signal and outputs a PWM signal; the error amplifier compensates according to the presetting soft-start compensating current when the power supply voltage is increased, and slowly charges a circuit common-ground VSS so as to lead the error signal to promote slowly until the soft-start control cycle comes to an end, thereby serving the soft-start function when the power supply voltage is increased.

Description

technical field [0001] The invention relates to a soft start pulse width modulation controller, in particular to a pulse width modulation controller applied to a switching voltage stabilizer. Background technique [0002] When the initial power supply voltage VDD of the switching regulator rises, because the gain of the error amplifier is too high, the pulse width modulation output has the largest duty cycle (Duty cycle) at the beginning, and the output terminal of the power conversion module is quickly charged by the input power supply , The power conversion system will be damaged by overvoltage and overcurrent, so it is necessary to use the soft start method to protect the power conversion system. [0003] figure 1 It is a circuit diagram of an existing pulse width modulation controller using a resistor 121, a capacitor 122, and Zener diodes 123 and 124 to realize soft start. In this circuit 10, when the power supply voltage VDD is about to rise, the circuit 10 uses the ...

Claims

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Application Information

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IPC IPC(8): H02M1/36H02M1/32
Inventor 丁明强
Owner NIKO SEMICON
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