![]() To avoid this, the ramp voltage should be proportional to V IN. This causes the crossover frequency to change as V IN changes. ![]() The control gain is also proportional to the input voltage (V IN). Voltage mode control requires either high ESR capacitors or type 3 compensation to stabilize the system. This error signal is compared to a voltage ramp to generate the power stage’s duty cycle. The difference between the feedback voltage and reference voltage (V FB - V REF) is amplified to generate an error signal (typically the comp voltage). Voltage mode control is one of the simplest control methods. ![]() Then ZDP TM and its benefits are also described in detail. Some common control topologies (voltage mode control, current mode control, and constant-on-time control) are described to establish a baseline for comparison with ZDP TM. MPS’s Zero-Delay PWM (ZDP TM) control provides many benefits for power supply designs, including fast transient response and a stable switching frequency (f SW). voltage mode control or peak current mode control). ZDP TM is an MPS proprietary, fixed-frequency power supply control method that improves transient response compared to a common fixed-frequency control method (e.g. This application note details Zero-Delay Pulse-Width Modulation (PWM) control (ZDP TM).
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