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SP6682ER Datasheet(PDF) 9 Page - Sipex Corporation |
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SP6682ER Datasheet(HTML) 9 Page - Sipex Corporation |
9 / 12 page 9 Date: 7/1 9/06 Rev D SP6682 High Efficiency Charge Pump Regulator for White LEDs © 2006 Sipex Corporation 70 75 80 85 90 95 100 2.7 3.0 3.3 3.6 3.9 4.2 VIN (V) D11 X5R Ceramic D3 SOT23 R2 15 25V L1 LQH32CN4R7M11 4.7uH D12 D8 DS SCHOTTKY MBR0530 D4 Q1 Ceramic EN/PWM R1 15 D6 C1 10uF D9 D7 C3 X5R 2.2uF 25V D10 D2 R3 1M ILED = VFB/R1 = 20mA SP6682 1 2 7 6 5 4 3 8 9 10 VOUT C1P C2N EN/PWM FB VMODE VIN GND C1N C2P D1 SI1304 D5 Vin: 2.7-4.2V Figure 16. Using SP6682 as a High Voltage White LED Driver PINOUTS SP6682 10 Pin DFN 10 9 8 7 6 1 2 3 4 5 C2P C1N GND C2N EN/PWM VOUT C1P VIN VMODE FB VOUT C1P VIN VMODE FB SP6682 10 Pin MSOP 1 2 3 4 5 10 9 8 7 6 C2P C1N GND C2N EN POWER EFFICIENCY The efficiency of driving the white LEDs can be calculated by: � = VF • IF = VF • IF � VF Vi •Ii Vi • (n • IF + IQ) Vi • n WhereVi,IiareinputvoltageandcurrentVF, IF are the forward voltage and operating current of White LEDs; IQ is quiescent cur- APPLICATION INFORMATION: Continued rent, which is considered small compared with IF; n is the boost ratio (X1.5 or X2). SP6682 HIGH VOLTAGE WHITE LED DRIVER The SP6682 can also be configured as a high voltage boost converter to drive more than 10 white LEDs. Figure 16 shows the schematic of this application as well as actual data showing efficiency of > 85%. By using an external inductor, MOSFET and diode, high output voltages can be generated to drive 12 white LEDs (2 branches -- each branch has 6 white LEDs in series). The current through the white LEDs is determined by: ILED = VFB R1 |
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