Kades LED ceiling lamp based on Si9553

Ka Desi LED ceiling constant current driver chip SI9553, the load in series eight total light bar 40 from the LED lamp, the circuit shown in Figure 1 the actual picture. Description: When all bright LED lamp, a voltage of about 125V test load point across R3 or C2), only a single LED lamp voltage drop of approximately 3.1V; open when the LED lamp load open circuit voltage of about 160V. 1. Constant current driver chip S19553 Profile S19553 is a high-precision small power non-isolation-bucking LED controller, a full voltage range (AC85V-AC265V) work, built-in high-precision sampling, compensation circuit, constant current accuracy ± 3%, has a good line type Adjustment rate and load adjustment rate. The internal IC integrated 500V power MOS-FET tube, having an output open / short circuit protection, sampling resistor open / short circuit protection, under voltage protection, output overvoltage and overtemperature adaptive function, the pin functions see Found Table 1. 2. work process Start: approximately DC300V mains voltage rectified through the startup resistor R1, the R2, R7 partial pressure of the U1 pin ④ external capacitor C3, ④ when the voltage reaches 12.8V start closing value, circuit after chip provided by the internal circuit without auxiliary power winding. ④ When the pin voltage is lower than 8.1V, the output circuit is stopped. Constant current control: SI9553 comparison calculation work in CRM (critical conduction mode) mode, the internal reference voltage is 400mV peak current and the inductor L, the sample adjustment LED drive current magnitude of the current through the resistor R4 // R5. When the internal IC MOSFET turns on, the energy storage inductor L starts; when the current reaches a peak, the MOSFET is turned off tube. Read more

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