Electronics > Power/Renewable Energy/EV's
estimate the running time for 3 led in parallel
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khiworld:
Hello.
This is what I did....
I got one 3.7v/ 1000mAh Li ion battery
V_battery flows to LED driver.......I set the resistor value for my target led current. V_fb is fixed to be 0.1V
3 LED in parallel.
Case 1.
R is set to be 0.43. so, I_led = V_fb / R = 0.1v / 0.43 = 235mA
Case 2.
R is set to be 0.51. I_ led = 0.1v/ 0.51 = 196mA
Simple calculation Measurement
Case 1.
1000mAh / (3*235mA) = 1.42 hour = 85min 150 min
Case 2.
1000mAh / (3*196mA) = 1.7 hour = 102min 174 min
Please correct me if I did wrong.
Thanks
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