基于iW3620的典型應(yīng)用電路
出處:davidli88 發(fā)布于:2011-08-19 13:00:52 | 3963 次閱讀
iW3620:Digital PWM Constant Current Controller for AC/DC LED Driver
The iW3620 is a high performance AC/DC offline LED driver which uses digital control technology to build peak current mode PWM flyback power supplies. The device operates in quasi-resonant mode at heavy load 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 iW3620 removes the need for secondary feedback circuitry while achieving excellent line and load regulation. It also eliminates the need for loop compensation components while maintaining stability over all operating conditions. Pulse-by-pulse waveform analysis allows for a loop response that is much faster than traditional solutions, resulting in improved dynamic load response. The built-in current limit function enables optimized transformer design in universal off-line applications over a wide input voltage range.
iW3620主要特性:
Primary-side feedback eliminates opto-isolators and simplifies design;
Quasi-resonant operation for highest overall efficiency and low EMI;
Up to 130 kHz switching frequency enables small size;
Very tight LED constant current regulation;
Built-in output constant-current control with primary-side feedback for LED driver;.
Low start-up current (10 μA typical);
Built-in soft start;
Built-in short circuit protection and output overvoltage protection;
Current sense resistor short protection;
Over-temperature Protection;
Open circuit protection;
Universal input range from 85 Vac to 264 Vac;
Single-fault protection;
Small input bulk capacitor;
Long MTBF;
High efficiency。

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