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TD8201 Datasheet(PDF) 8 Page - TECHCODE SEMICONDUCTOR, INC. |
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TD8201 Datasheet(HTML) 8 Page - TECHCODE SEMICONDUCTOR, INC. |
8 / 11 page ![]() December, 20, 2011 Techcode Semiconductor Limited www.techcodesemi.com 8 Techcode® White LED Step-up Converter TD8201 DATASHEET ILED(mA) RFB Value(Ω) 5 20.8 10 10.4 15 6.93 20 5.1 Function Description Driving Capability Inductor Selections Capacitor Selection The small size of ceramic capacitors makes them ideal for TD8201 applications. X5R and X7R types are recommended because they retain their capacitance over wider voltage and temperature ranges than other types such as Y5V or Z5U. A 1μF input capacitor and a 0.22 μF output capacitor are sufficient for most TD8201 applications. Diodes Selection Schottky diodes, with their low forward voltage drop and fast reverse recovery, are the ideal choices for TD8201 applications. The forward voltage drop of a Schottky diode represents the conduction losses in the diode, while the diode capacitance (CT or CD) represents the switching losses. For diode selection, both forward voltage drop and diode capacitance need to be considered. Schottky diodes with higher current ratings usually have lower forward voltage drop and larger diode capacitance, which can cause significant switching losses at the 1.25MHz switching PARTNUMBER DCR(Ω) CURRENT RATING(mA)MANUFACTURER LQH3C220 0.71 250 MURATA CDRH3D16‐220 0.53 350 SUMIDA LB2012B220M 1.7 75 TAIYO YUDEN LEM2520‐220 5.5 125 TAIYO YUDEN EJPC220KF 4.0 160 PANASONIC frequency of the TD8201. A Schottky diode rated at 100mA to 200mA is sufficient for most TD8201 applications. Some recommended Schottky diodes are listed in the following table: LED Current Control The LED current is controlled by the feedback resistor. The feedback reference is 104mV. The LED current is 104mV/Rfb. In order to have accurate LED current, precision resistors are preferred (1% is recommended). The formula and table for RFB selection are shown below Open Circuit Protection Open circuit protection will shut off the TD8201 if the output voltage goes too high when the OV pin is tied to the output. In some cases an LED may fail, which will result in the feedback voltage always being zero. The TD8201 will then switch at its maximum duty cycle boosting the output voltage higher and higher. By connecting the OV pin to the top of the LED string the TD8201 checks this condition and if the output ever exceeds 20V, the TD8201 will shut down. The part will not switch again until the power is recycled. PART NUMBER FORWARD CURRENT (mA) VOLTAGE DROP (V) DIODE CAPACITAN CE MANUFACTURER CMDSH‐3 100 0.58@100mA 7.0@10V Central CMDSH2‐3 200 0.49@200mA 15@10v Central BAT54 200 0.53@100mA 10@25v Zetex |
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