In LED lighting, the trend of replacing traditional fluorescent lamps with LED fluorescent lamps is becoming increasingly clear. Compared with traditional fluorescent lamps, LED fluorescent lamps can save at least 30% of electricity, and the lifespan is 5-8 times that of traditional fluorescent lamps. At present, the design limitations of fluorescent lamps are mainly in the aspects of heat dissipation design and power supply design. The heat dissipation design has evolved from the original full PC tube to the current semi-PC semi-aluminum tube structure. Each heat dissipation design has its own advantages. At present, the whole industry pays attention to heat dissipation and heat dissipation design is much more mature than it was a year ago; It is a new generation of energy-saving products, so from the beginning of product definition, it puts high demands on the power supply, mainly in high performance, long life, small volume, low temperature rise, high reliability and so on.
The FT880 is a new generation of products newly developed for the existing LED fluorescent lamps on the market. It has the following features:
1. FT880 is manufactured by 500V high-voltage process, which makes the circuit have the characteristics of dynamic self-power supply, feedback zero current supply, 2ms ultra-fast start, etc. The long-term working circuit is more reliable;
2, the circuit can be configured as Buck, Buck-Boost, Boost and other circuit topologies to facilitate different LED application needs.
3. FT880 has PWM\PFM working mode, which enables the circuit to apply the patented “full voltage constant current technology†and can be flexibly configured to meet different topology and LED configurations for different working modes;
4, the chip operating frequency is adjustable, and can be configured as a fixed off-time mode, making the circuit application more flexible;
5, for the LED application to increase the linear dimming, PWM dimming function, you can input the dimming signal from the outside, you can also use FMD's patented LED dimming mode;
6, the chip has a 2-level current detection mechanism, can synchronously detect LED short-circuit anomaly, and reliably protect the LED;
7, the ultra-low operating voltage of the chip 7.5V, so that the chip works in a low power state of 1mA typical value, effective peripheral device price and volume.
8. The chip can be configured as an optocoupler feedback type at the same time, which achieves the mass production of the circuit without adjustment, and realizes the output open circuit protection at low cost.
Figure 1 shows the typical application of FT880
As shown in Figure 1, the FT880 typical application scheme uses a high-efficiency low-side Buck topology, using the patented “full-voltage constant-current technology†and “zero-current power supply technologyâ€, and adopts a passive PFC circuit to improve the power factor of the scheme. The output optocoupler realizes open circuit protection and reduces the output voltage withstand voltage. The power range of driving the LED is 6W~30W. The program also has the following main features:
1, full voltage input range: 90 ~ 277VAC, can be used worldwide
2. The shielding design is specially designed for the fluorescent tube aluminum tube, and the shielding design inside the aluminum tube is necessary.
3, ultra-small volume design, suitable for T8, T10 fluorescent tube PC tube \ aluminum tube (10mm high, 13.6mm wide)
4, high efficiency, efficiency reaches 90%
5. Meet the requirements of Energy Star power factor greater than 0.9
6, the overall temperature rise is less than 30 ° C
7, full voltage current accuracy ± 2%, using patent full voltage constant current technology
8. Meet EN55015B EMI requirements
9, no-load power consumption is less than 0.3W
10, with output overvoltage protection, short circuit protection, overload protection, reverse connection protection
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