Improved transient response using high‐frequency feedback control circuit of the constant current ripple constant on‐time with native adaptive voltage positioning design for voltage regulators

Abstract

Improved transient response using high-frequency feedback control (HFFC) circuit of the constant current ripple constant on-time (CCRCOT) with native adaptive voltage positioning design for voltage regulators (VRs) is proposed in this study. The concept uses the HFFC circuit to filter V out at the load transient to change the on-time width dynamically, preventing V out from dropping markedly. This proposal does not need an extra pin to achieve a quick response circuit. Finally, the multiphase VR with the HFFC circuit of the CCRCOT for the IC circuit of the proposed buck converter is implemented by experiment and simulation results to verify their viability and superiority.

Improvement of speed response in four‐phase DC–DC converter switching using two shunt voltage‐source

“…Ongoing studies are being conducted to further enhance the dynamic response of the multiphase DC-DC converter with a reduced output capacitor size by developing the controller schemes [10][11][12][13] or introducing an additional energy path to compensate the charge perturbation in the output capacitor [14][15][16]. Although a fast transient response can be achieved by simultaneously turning ON all the inductors of the step changing phase control, the phase inductors are in turn subjected to increased losses in the core [13].…”

“…Although a fast transient response can be achieved by simultaneously turning ON all the inductors of the step changing phase control, the phase inductors are in turn subjected to increased losses in the core [13]. As an example, the adaptive voltage positioning (AVP) uses an auxiliary current source to increase the output voltage under no load or light load conditions and decreases it under heavy load conditions [14, 15]. Since the system utilises the output capacitor current to anticipate for load transients, its implementation tends to be complex and the system would still suffer from high switching losses due to the current source regulator.…”

Power integrated circuit implementation of optimal adaptive voltage positioning scheme using progressive waveform shaping algorithm

“…To most mobile devices deem that area efficiency is highly important, saving the most capacitors that can use for maintaining operating voltage is the optimal goal. For this reason, several literatures proposed different methodologies to realise AVP [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. In analogue-based AVP design, the value of current sensing parameter (R i ) needs to be determined by the load-line resistor (R LL ), where R LL is defined by the voltage regulation (VR) specification related to the voltage allowable window.…”

“…In analogue‐based AVP design, the value of current sensing parameter ( R i ) needs to be determined by the load‐line resistor ( R LL ), where R LL is defined by the voltage regulation (VR) specification related to the voltage allowable window. Once R i is set, current sensing gain could be designed in accordance with this value and be implemented by external compensator components [17]. However, this method does not guarantee that voltage transient waveform is kept within the allowable variation range.…”