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SP6686 Datasheet(PDF) 9 Page - Sipex Corporation |
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SP6686 Datasheet(HTML) 9 Page - Sipex Corporation |
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9 / 13 page  9 Date: 03/10/06 SP6686 400mA, Buck/Boost Charge Pump LED Driver © Copyright 2006 Sipex Corporation regulation point for more than 32 cycles of the internal clock, the SP6686 automati- cally switches to the 2X mode. The SP6686 remains in the 2X mode until one of four things happens: 1) the enable pin EN has been toggled, 2) the Flash pin has changed from high to low, 3) V IN is cycled or 4) a thermal fault occurs. The 2X mode is the charge pump mode where the output can be pumped as high as two times the input voltage, provided the output does not ex- ceed the maximum voltage for the SP6686, which is internally limited to about 5.5V. In the 2X mode, as in the 1X mode, the output current is regulated by the voltage at the FB pin. In the Torch mode, (Flash = GND) the Flash pin is set to logic low and the SP6686 FB pin regulates to 50mV output: V FB = 50mV (Torch Mode) When in Flash mode, (Flash = V IN), the FB regulation voltage is set by the resistor R SET connected between the R SET pin and SGND and the equation: V FB = (1.26V/ RSET)*11.2KΩ (Flash Mode) Where 1.26V is the internal bandgap refer- ence voltage and 11.2KΩ is an internal resistance used to scale the R SET current. Typical values of R SET are 40KΩ to 180KΩ for a range of V FB = 300mV to 75mV in Flash mode. The output current is then set in either Flash or Torch mode by the equation: I OUT = VFB / RSENSE _______________OVERTEMPERATURE PROTECTION When the temperature of the SP6686 rises above 145 degrees Celsius, the over tem- perature protection circuitry turns off the output switches to prevent damage to the device. If the temperature drops back down below 135 degrees Celsius, the part auto- matically recovers and executes a soft start cycle. ____________________OVERVOLTAGE PROTECTION The SP6686 has over voltage protection. If the output voltage rises above the 5.5V threshold, the over voltage protection shuts off all of the output switches to prevent the output voltage from rising further. When the output decreases below 5.5V, the device resumes normal operation ____________________OVERCURRENT PROTECTION The over current protection circuitry moni- tors the average current out of the V OUT = 50mV (Torch Mode) pin. If the average output current exceeds approximately 1Amp, then the over current protection cir- cuitry shuts off the output switches to pro- tect the chip. THEORY OF OPERATION |
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