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NSI45015WT1G Datasheet(PDF) 5 Page - ON Semiconductor |
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NSI45015WT1G Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 8 page NSI45015WT1G http://onsemi.com 5 APPLICATIONS INFORMATION The CCR is a self biased transistor designed to regulate the current through itself and any devices in series with it. The device has a slight negative temperature coefficient, as shown in Figure 2 – Tri Temp. (i.e. if the temperature increases the current will decrease). This negative temperature coefficient will protect the LEDS by reducing the current as temperature rises. The CCR turns on immediately and is typically at 20% of regulation with only 0.5 V across it. The device is capable of handling voltage for short durations of up to 45 V so long as the die temperature does not exceed 150 °C. The determination will depend on the thermal pad it is mounted on, the ambient temperature, the pulse duration, pulse shape and repetition. Single LED String The CCR can be placed in series with LEDs as a High Side or a Low Side Driver. The number of the LEDs can vary from one to an unlimited number. The designer needs to calculate the maximum voltage across the CCR by taking the maximum input voltage less the voltage across the LED string (Figures 7 and 8). Figure 7. Figure 8. Higher Current LED Strings Two or more fixed current CCRs can be connected in parallel. The current through them is additive (Figure 9). Figure 9. |
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