Описание
The iW1816 is a high performance AC/DC power supply control device which uses digital control technology to build peak current mode PWM flyback power supplies. This device includes an internal power BJT and operates in quasi-resonant mode to provide high efficiency along with a number of key built-in protection features while minimizing the external component count, simplifying EMI design, and lowering the total bill of material cost. The iW1816 removes the need for secondary feedback circuit while achieving excellent line and load regulation. It also eliminates the need for loop compensation components while maintaining stability in all operating conditions. The pulse-by-pulse waveform analysis allows for a loop response that is much faster than traditional solutions, resulting in improved dynamic load response for both one-time and repetitive load transients. The built-in power limit function enables optimized transformer design in universal off-line applications and allows for a wide input voltage range.
? Primary-side feedback eliminates opto-isolators and simplifies design ? Internal 800-V bipolar junction transistor (BJT) ? Adaptively controlled soft start-up enables fast and smooth start-up for a wide range of output voltage (5V, 12V and above) and capacitve loads up to 6,000µF ? 64kHz PWM switching frequency ? No-load power consumption < 30mW at 230VAC with typical application circuit ? Fast dynamic load response for both one-time and repetitive load transients ? Adaptive multi-mode PWM/PFM control improves efficiency ? Quasi-resonant operation for highest overall efficiency ? EZ-EMI® design easily meets global EMI standards ? Very tight constant voltage and constant current regulation with primary-side-only feedback ? No external compensation components required ? Built-in single-point fault protections against output short circuit, output over-voltage, and current-sense-resistor short-circuit faults ? Built-in over-temperature protection (OTP) ? No audible noise over entire operating range
