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SP6685ER Datasheet(PDF) 10 Page - Sipex Corporation |
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SP6685ER Datasheet(HTML) 10 Page - Sipex Corporation |
10 / 16 page 10 Date: 7/6/06 Rev B SP6685, 700mA Buck/BoostCharge Pump LED Driver © 2006 Sipex Corporation TYPICAL PERFORMANCE CHARACTERISTICS The SP6685 can be used with multiple LEDs in parallel as shown in figure 31. For best performance, the LEDs should be in a single package, preferably from a single die to have better matching for forward voltage Vf for a given forward current If. In practice, if the Vf of one LED is higher than the others, it will consume a larger If, which will raise its temperature which will then cause its Vf to reduce, correcting the imbalance. The overall current will be the sum of the individual currents, for example Itotal = 4*ILED. GM5BW05340AC J2 1 2 3 D1 Sharp LED Cout 4.7 uF CF 1uF Vin: 3.0-4.2V SP6685 Vin 1 C1 2 IFB 7 ISET 6 EN 5 FLASH 4 C2 3 SGND 8 PGND 9 VOUT 10 R SET 139K R EN 10K Cin 10uF R FB 0.33 Ohm SW2 Push ON VFB = 50mV Torch150mA 100mV Flash 300mA Jumper Efficiency 40 50 60 70 80 90 100 3.0 3.2 3.4 3.6 3.8 4.0 4.2 Vin (V) Flash 600mA Flash 300mA Torch 150mA Flash 400mA Flash 500mA Output Current 0 100 200 300 400 500 600 700 800 900 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2 Vin (V) Flash 600mA Vf=4.34V Flash 500mA Vf=4.13V Flash 400mA Vf=3.93V Flash 300mA Vf=3.72V Torch 150mA Vf=3.33V Figure 29. Efficiency vs. VIN. Figure 30. Output Current vs. VIN. Figure 31. MULTIPLE LED FLASH CIRCUIT. APPLICATION INFORMATION Application Circuit = Figure 31, TA = 25°C. |
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