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Pulse width modulation voltage stabilizer IC and circuit thereof

A pulse width modulation and voltage regulator technology, which is used in the direction of regulating electrical variables, instruments, electrical components, etc.

Inactive Publication Date: 2013-03-27
NIKO SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this structure will lead to an increase in the number of pins, resulting in an increase in production costs, and even causes the pulse width modulation regulator IC 11 to be unable to match the existing IC package structure
On the other hand, if this capacitor is placed inside the pulse width modulation regulator IC 11, the size of the IC will increase. At the same time, the capacitor set in the IC cannot be adjusted according to actual needs, which will also affect the user experience. elasticity

Method used

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  • Pulse width modulation voltage stabilizer IC and circuit thereof
  • Pulse width modulation voltage stabilizer IC and circuit thereof
  • Pulse width modulation voltage stabilizer IC and circuit thereof

Examples

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Embodiment Construction

[0052] figure 2 Shown is a schematic diagram of a synchronous drop DC / DC conversion circuit according to the first embodiment of the present invention. As shown in the figure, the synchronous drop DC / DC conversion circuit 20 has a PWM regulator IC 21 . In the figure, a PWM regulator IC 21 with eight pins is taken as an example for illustration. These eight pins are marked as VCC, FB, COMP, PHASE, LSD, VSS, HSD, BST respectively. It should be noted that the PWM regulator IC 21 omits the VIN pin of the PWM regulator IC 11 in the first figure. The VIN pin is used to receive the input voltage signal Vin. In the first embodiment of the present invention, the input voltage signal Vin shares the BST pin with the bootstrap high voltage signal CKBST. Therefore, the PWM regulator IC 21 of this embodiment can use the omitted pin as the COMP pin.

[0053] The synchronous drop DC / DC conversion circuit 20 has two switches Q1, Q2 connected in series between an input terminal and a grou...

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Abstract

The invention relates to a pulse width modulation voltage stabilizer integrated circuit (IC) and a circuit thereof. The pulse width modulation voltage stabilizer IC is used for controlling the switch-on period of at least one switch so as to convert an input voltage signal into an output voltage. A pin is selected and is used for receiving an input signal different from the input voltage signal, the duration of the input signal is approximately identical to that of the input voltage signal, but the waveform of the input signal is different from that of the input voltage signal, the input signal is converted into a square signal by a conversion unit, and a pulse width modulation controller generates a pulse width modulation driving signal according to the square signal so as to control the switch-on period of the switch. The input pins can be flexibly regulated so as to increase the types of the IC input signals by means of a method for regulating the internal or external circuit design of the IC under the condition of not increasing the number of pins of the IC.

Description

technical field [0001] The invention relates to a voltage stabilizer IC and its application circuit, in particular to a pulse width modulation voltage stabilizer IC and its circuit. Background technique [0002] figure 1 It is a schematic diagram of a typical synchronous buck DC-to-DC converter circuit (Synchronous Buck DC-to-DC converter circuit). The DC / DC conversion circuit has two switches Q1, and Q2 is connected in series between an input terminal (that is, used for inputting an input voltage signal Vin) and a ground terminal G, and is alternately turned on. By changing the duty cycle of the two switches Q1 and Q2, the level of the output voltage Vo can be adjusted. The filter circuit is composed of an inductor L1 and a capacitor C2, which are connected to the junctions of the two switches Q1 and Q2 to stabilize the output voltage Vo. [0003] The switches Q1 and Q2 connected in series between the input terminal and the ground terminal G mostly use N-type metal oxide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155
Inventor 林春敏刘格正
Owner NIKO SEMICON
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