With fast transient response, less output capacitance is needed to meet the design specifications for the regulator. Controller ICs that implement APP modulation can respond to transient events immediately and require much less output capacitance than other modulators. This modulation scheme adopts two separate ramp signals to control both the leading edge and trailing edge of the PWM pulse. Renesas's approach to PWM, known as Active Pulse Positioning (APP), achieves very fast transient response by dramatically reducing the modulator delay time. Active Pulse Positioning (APP) Modulated PWM OperationĬonventional pulse width modulation schemes have delay times that can increase the demand on the output capacitors, forcing designs to employ more capacitors for acceptable performance. Conventional pulse width modulation schemes have delay times that can increase the demand on the output capacitors, forcing designs to employ more capacitors for acceptable performance. Transient response is a key performance parameter for the multiphase voltage regulator, especially in microprocessor applications. Dual-Edge PWM Improves Multiphase Regulators Our ICs can react to loads at very high speeds, are highly efficient and have evolved into much smaller form factors to drive innovation in the digital market. Renesas's multiphase modulation technology comes from our experience in analog multiphase controllers used in computing, but is becoming applicable to a much larger set of applications. More voltage rails in a system lead to more complex power management needs. Pulse width modulation (PWM) is utilized to control the input to the associated power switch and reduce output capacitance. Switch-mode DC/DC converters require a means to vary their output voltage in response to changes in their load. Multiphase Power Conversionĭesigning a regulator that is cost-effective, thermally sound and efficient has become a challenge that only multiphase converters can accomplish.
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