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SP6682ER Datasheet(PDF) 6 Page - Sipex Corporation |
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SP6682ER Datasheet(HTML) 6 Page - Sipex Corporation |
6 / 12 page 6 Date: 7/1 9/06 Rev D SP6682 High Efficiency Charge Pump Regulator for White LEDs © 2006 Sipex Corporation A 3-wire white LED module with internal series resistors as shown in figure 11 can also be driven in this way. The current in one white LED current is set by the ratio of the feedback pin voltage (306mV) and the bias resistor RB. To set the operating current, RB can be selected by: RB = VFB ILED The current of the remaining white LEDs is set according to the similarity of the white LEDs. CONFIGURING THE SP6682 AS VOLTAGE OR CURRENT SOURCE The white LED load configuration used by customers can be discrete white LEDs or a white LED module. Inside the white LED module, there may or may not be resistors in series with the white LEDs. According to the different application requirements, the SP6682 can be configured as either a voltage source or a current source to provide solutions for these different applications, as shown in figures 10-13. Figure 10 shows a circuit using the SP6682 to drive discrete white LEDs as a current source. 1 8 5 Rb SP6682 Rb 2.2uF GND FB VOUT Figure 10. Driving discrete white LEDs as current source 3-wire W-LED module Anode FB GND Fig 11. 3-wire white LED module GND VOUT Anode 5 VFB Rb SP6682 Cathode 8 2-wire W-LED module 1 Figure 12. Driving 2-wire white LED module as current source In this application, the bias resistor can be selected by: RB = VFB ILED (TOTAL) where ILED(TOTAL) is the total operating cur- rent of all the white LEDs. APPLICATION INFORMATION In Figure 12, the SP6682 was used to drive a 2-wire white LED module without internal series resistors as a current source. The bias resistor RB is selected to regulate the total current of the white LED module in- stead of the current of single LED as in Figure 10. |
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