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Controllable on-time reduction for switching voltage regulators operating in pfm mode

A voltage regulator, on-time technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve problems such as increased output voltage ripple

Active Publication Date: 2018-04-20
INFINEON TECH AUSTRIA AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the constant PFM on-time causes the output voltage ripple to increase with PFM operation

Method used

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  • Controllable on-time reduction for switching voltage regulators operating in pfm mode
  • Controllable on-time reduction for switching voltage regulators operating in pfm mode
  • Controllable on-time reduction for switching voltage regulators operating in pfm mode

Examples

Experimental program
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Embodiment Construction

[0017] Embodiments described herein reduce the output voltage ripple of a switching voltage regulator by varying the PFM (Pulse Frequency Modulation) on-time of the switching voltage regulator in response to changes in the load while achieving Efficiency improvement. This embodiment provides flexibility by allowing the user to select whether and when the on-time is changed in PFM operation. This allows the implementation of system-specific optimizations.

[0018] figure 1 An embodiment of a switching voltage regulator 100 is shown that includes a plurality of power stages 102 and a controller 104 for controlling the operation of the power stages 102, such as a microcontroller, microprocessor, ASIC (Application-Specific Integrated Circuit). Each power stage 102 is operable to pass a separate inductor (L n ) delivers the phase current to the load 106 (i Ln ), the load 106 passes through the inductor and output capacitor (C OUT ) is connected to the switching voltage regula...

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PUM

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Abstract

A switching voltage regulator includes a power stage that delivers output current to a load through an inductor. This power stage has a high-side transistor and a low-side transistor. The switching voltage regulator also includes a controller for setting the power stage into a PFM (Pulse Frequency Modulation) switching mode when the output current decreases below a first threshold. Each cycle in this PFM switching mode consists of an on-time during which the high-side transistor is on and a low-side transistor is off, an off-time during which the low-side transistor is on and a HiZ time, and a HiZ time , both the high-side transistor and the low-side transistor are off during the HiZ time. The controller varies the on-time of the PFM switching mode in response to changes in output current.

Description

technical field [0001] The present application relates to switching voltage regulators, in particular to pulse frequency operating modes for switching voltage regulators. Background technique [0002] Switching voltage regulators are widely used in modern electronics for various applications such as computing (servers and mobile phones) and POL (point-of-load systems) for communication due to their high efficiency and small area / space consumption. used in the system. Widely accepted switching voltage regulator topologies include buck, boost, buck-boost, forward, flyback () topology, half-bridge, full-bridge, and SEPIC topologies. Multiphase buck converters are particularly well-suited for delivering the high current at low voltage required by high-performance integrated circuits such as microprocessors, graphics processors, and network processors. A buck converter is implemented with active components such as a pulse width modulation (PWM) controller IC (Integrated Circuit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156H02M1/00
CPCH02M3/156H02M3/1584H02M3/1588Y02B70/10H02M1/0032H02M3/158
Inventor D·奇尔哈特B·唐R·皮尔逊
Owner INFINEON TECH AUSTRIA AG