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The AP3129 is a highly integrated multi-mode peak current controller, which specially provides high efficiency at light load for IoT application. Meanwhile, the AP3129 features a proprietary audible noise elimination technology to ease the acoustic noises from electronic and magnetic components.
The AP3129 is a multi-mode controller, which changes operating mode according to load conditions. Under heavy-load condition, the device operates in CCM (continuous-conduction mode) with a fixed switching frequency of 65kHz, which is helpful to system design with small transformer size. When the loading is decreasing, it enters QR (Quasi Resonant) or Green mode with valley switching for the higher power conversion efficiency. At light load or no load, the IC will operate with its proprietary burst mode to minimize power consumption with the minimum switching frequency (about 22kHz).
The controller architecture is designed to authorize a transient peak power excursion for peak load. It means the frequency can be increased from 65kHz to 130kHz until the peak event disappears.
In addition, piecewise linear line compensation ensures accurate constant output power limit over an entire line voltage range.
Multiple Operation Modes
130kHz Maximum Frequency for Peak Load
65kHz Fixed-Frequency CCM Operation for Full Load
80kHZ Maximum Clamping Frequency for QR Mode
Valley Switching Operation in Green Mode
Burst Mode Control for Light Load
High Efficiency at Light Load (> 90% Efficiency at 10% Load)