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YB1313 Datasheet(PDF) 7 Page - YOBON TECHNOLOGIES,INC. |
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YB1313 Datasheet(HTML) 7 Page - YOBON TECHNOLOGIES,INC. |
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7 / 9 page  YB1313 1x/1.5x/2x Charge Pump for White LED Application YB1313 MRev.1.1 www.yobon.com.tw 7 Thermal Protection The regulator has thermal shutdown circuitry that protects it from damage caused by high temperature conditions. The thermal protection circuitry shut down the device when the junction temperature reached approximately 160℃, allowing the device to cool. When the junction temperature cools to approximately 140℃, the device is automatically reenabled. Continuously running the regulator into thermal shutdown can degrade reliability. Undervoltage Lockout The undervoltage lockout circuit shuts down the device when the voltage at VIN drops below a typical threshold of 2.2V. The prevents damage to the devices. Termination of Unused Current Source Outputs If any outputs (D1 to D5) are not used, the LEDs pin should be connected to VDD or floating. Figure 4 shows the connection for 4LEDs application, D5 pin is connection to VDD directly. Figure 4. Application for 4 LEDs. Power Efficiency The battery current and efficiency of the YB1313 are mostly dependent on the chare pump mode of operation. To get the best performance form the YB1313 it is better to use LEDs with consistently lower VF voltage. Lower VF will keep the charge pump in 1x mode longer and will uses less battery current, extending the run time of the battery. The power conversion efficiency of the YB1313 can be calculated by adding up the products of each LED current and voltage and dividing it by the product of the input voltage and current. With a fully charged battery where the input voltage is typically above the LED forward voltage, the charge pump operates in the 1x mode and efficiency is high. As the battery discharges, there is a point where the current sources no longer have enough voltage overhead to maintain a constant current regulation. At that point, the charge pump switches into the 1.5x mode. The conversion efficiency is lowest at the crossover. When in 1x mode the voltage conversion efficiency is defined as output power divided by input power: 100% 100% () OUT OUT OUT IN IN IN IN OUT Q OUT OUT OUT IN IN OUT Q PV I PV I II I PV I PV I I η η × == × × =+ × == × ×+ When in 1.5x or 2x mode the voltage conversion efficiency is as output power divided by input power: |
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