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SP7615 Fiches technique(PDF) 4 Page - Sipex Corporation |
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SP7615 Fiches technique(HTML) 4 Page - Sipex Corporation |
4 / 11 page 4 Oct 23-06 SP7615 Four Channel Constant Current LED Driver © Copyright 2006 Sipex Corporation THEORY OF OPERATION The voltage applied to the cathode of each LED determines the overall efficiency of the SP7615 circuit. The SP7615 is designed to be able to sink 125mA at each of its four outputs; LED1 - 4. The SP7615 is also designed to be able to handle up to 16V on these pins. This voltage handling capability assumes the total power can be dissipated by the SP7615. The power dissipation inside the SP7615 will de directly related to the voltage and current applied to these pins. For example, the typical operating cathode voltage is 500mV. At maximum current the VCC EN GND C1 1n R1 R2 SP7615 ® EN GND LED1 VCC ISET LED2 LED3 LED4 SP7615 ® EN GND LED1 VCC ISET LED2 LED3 LED4 power dissipated by one LED driver output is 125mA * 500mV = 62.5mW. The charts in the following pages show the power dissipation of the SP7615 under various conditions. The power dissipation should be kept below 1.3W for safe operation and long term reliability at room temperature and derated to 530mW at 85ºC. While the above operating conditions are recommended, the part cannot be damaged due to internal temperature control as described above in the thermal shutdown section. CATHODE VOLTAGE, SUPPLY VOLTAGE AND POWER DISSIPATION Current sharing capabilities allow two SP7615s to run in parallel for twice as much current through the LEDs. |
Numéro de pièce similaire - SP7615_06 |
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Description similaire - SP7615_06 |
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