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DI-74 Datasheet(PDF) 2 Page - Power Integrations, Inc. |
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DI-74 Datasheet(HTML) 2 Page - Power Integrations, Inc. |
2 / 2 page www.powerint.com C 6/06 DI-74 Power Integrations 5245 Hellyer Avenue San Jose, California 95138 MAIN PHONE NUMBER APPLICATIONS HOTLINE APPLICATIONS FAX For a complete listing of worldwide sales offices, +1 408-414-9200 +1 408-414-9660 +1 408-414-9760 please visit www.powerint.com Power Integrations reserves the right to make changes to its products at any time to improve reliability or manufacturability. Power Integrations does not assume any liability arising from the use of any device or circuit described herein. POWER INTEGRATIONS MAKES NO WARRANTY HEREIN AND SPECIFICALLY DISCLAIMS ALL WARRANTIES INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT OF THIRD PARTY RIGHTS. The products and applications illustrated herein (transformer construction and circuits external to the products) may be covered by one or more U.S. and foreign patents or potentially by pending U.S. and foreign patent applications assigned to Power Integrations. A complete list of Power Integrations' patents may be found at www.powerint.com. Power Integrations grants its customers a license under certain patent rights as set forth at http://www.powerint.com/ip.htm. The PI logo, TOPSwitch, TinySwitch, LinkSwitch, DPA-Switch, PeakSwitch, EcoSmart, Clampless, E-Shield, Filterfuse, PI Expert and PI FACTS are trademarks of Power Integrations, Inc. Other trademarks are property of their respective companies. ©Copyright 2006, Power Integrations, Inc. For the latest updates, visit www.powerint.com Figure 2. Conducted EMI Plot of the Schematic Shown in Figure 1 for 3 Strings of 4 LED's (10 V, 66.6 mA). Figure 3. VI Characteristic of the Schematic Shown in Figure 1. Key Design Points • The output is not safety isolated from the input. • The circuit shown in Figure 1 has a total output current tolerance of ±12% (including ∆t of 50 °C). • To prevent noise coupling and to decrease EMI, place the input filter components physically away from the source node of the LinkSwitch-TN and L1 inductor. The DC input filter capacitors C1 and C2 can be placed, as a barrier, between the AC input and U1/L1. • Select C4 so that C4 ≥ 20 • (15 ms / R3), to provide adequatefilteringofthecurrentsensevoltage.Valuesabove 50 • (15 ms / R3) will yield little improvement in CC linearity. • Select C5 based on the acceptable peak current through the LEDs. Larger values of capacitance reduce peak LED current. Typical values are 100 nF to 100 µF, low ESR. With no capacitor the peak output current is equal to the internal current limit of U1. • With the values of R1 and R2 shown, the value of R3 is calculated by R3 = 2 V / I O. • The supply's total required output current is determined by the number of LED strings in the load, and is limited by the value of L1 and the current limit of U1. For this circuit, the load should be ≤100 mA and ≤1.25 W total. 1.0 0.15 10.0 100.0 -20 -10 0 10 20 30 40 50 60 80 70 MHz QP AV Average Quasi-Peak 0 40 20 60 80 100 120 Output Current (mA) 10 15 5 0 20 25 AC Input = 85 V AC Input = 265 V |
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