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GM9130HV датащи(PDF) 6 Page - Gamma Microelectronics Inc. |
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GM9130HV датащи(HTML) 6 Page - Gamma Microelectronics Inc. |
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6 / 9 page ![]() 6 GM9130HV 3A LED Driver with Dimming Control Application Notes Output Current (ILED) Design, refer to Figure 1 The current through the LED’s can be set by the formula below. ILED = VFB/RLOAD For example, if 2Ω RLOAD is selected, with VFB = 200mV typical, then ILED = 200 / 2 = 100mA Power / Heat Consideration Various ILED could be obtained by different resistor values as mentioned above. However, taking the TO263-5 as an example, the maximum power rating must be followed. TJ = PIC × θJA + TA where PIC is the power of the IC itself, and θJA is the thermal resistance (junction to ambient). For TO263-5, the θJA is 50°C/W, the safe power will be PIC = TJ –TA /θJA = (150 – 25)/50 = 2.5W, and PIC = PIN – PLED, Where PIN = VIN × IIN, and PLED = VOUT × ILED (VOUT = VF × number of LED) |
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