PWM controllers suited for quick-charge applications
The AP3127/H current-mode PWM controllers from Diodes Incorporated are optimised for quick-charge applications in portable consumer products. The controllers provide a high-performance and cost-effective solution in end equipment such as such as intelligent phone chargers, notebook adaptors, STBs, game consoles, modems and networking equipment.
In normal operation, the PWM switching frequency of the AP3127 and AP3127H controllers is internally fixed at 65 and 100kHz, respectively. However under moderate load conditions the device will enter a green mode that uses frequency fold-back to reduce the switching frequency for improved system efficiency, although a minimum switching frequency of 20kHz ensures any audible noise is avoided. Under no-load or light-load conditions, the ICs use a burst mode to minimise standby power while a built-in frequency dithering function reduces EMI emissions.
In addition to offering superior power control with higher average efficiency than pin-equivalent competitive products, the AP3127/H controllers include a comprehensive range of protection features to ensure stable, robust and reliable operation. These cover various overload and fault conditions such as over-current, secondary-side over-voltage, internal over-temperature and secondary-side under-voltage protection, which protects a supply if its output cable is shorted.
The AP3127/H PWM controllers are supplied in standard SOT26 packages, priced at $0.34 each in 1,000 unit quantities.
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