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SMD802 is an efficient PWM LED constant current drive application design uses IC, input voltage is OK town report is direct power supply of rectification filter wave, highest 450V DC; Be as high as 300KHz but drive of frequency of process designing set is exterior high-pressured MOSFET; Load current of setting of exterior sampling resistor arrives from 10mA 1A; SMD802 also can offer PWM of low frequency gray scale to move smooth function, the proposal designs 200Hz-1KHz.
SMD802 is a low cost but the step-down, step up, control chip that rises step-down, suit to design drive particularly many strings of LED or LED array. This chip applies to the AC communication input with general whole world already, also apply to 8 - the dc input of 450V. When communication is inputted, to raise power element, circuitry of adducible current and energy-saving lamp, 25W is less than in power input, road of positive electricity of school of passive power element can be joined very easily to be able to come true in circuit.
SMD802 the LED that the LED that about a hundred Gao Liang spends drive establishs ties or can count string of tall brightness, the kind that these LED can be become a string by the design or series-parallel connection ties, SMD802 through adjusting constant current value can ensure LED brightness and spectrum prolong life. The characteristic of SMD802 is to make can crural PWM_D can use wide modulation of arteries and veins (the method of PWM) adjusts LED brightness, hold concurrently at the same time make can be carried, the chip when this end is impending does not have output control. SMD802 also can carry linear and pressure regulating means to adjust continuously through LD the output electric current of LED controls brightness thereby (also call linear attune smooth) .
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SMD802 is controallable include to keep apart / blame segregation, successive / blame is successive wait for all kind of converter. When GATE end outputs tall n drive external when power MOSFET, LED driver will store inductance or transformer the input energy of former edge inductance, depend on different converter type, likelihood store can mix express partial energy LED to string together directly, when power MOSFET closes, store the drive electric current that the energy changeover on magnetic component strings together for LED. (The job is in Flybac mode) .