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TPS92411DDAR Fiches technique(PDF) 10 Page - Texas Instruments |
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TPS92411DDAR Fiches technique(HTML) 10 Page - Texas Instruments |
10 / 22 page Time 49 89 129 169 209 249 000 001 010 011 100 101 110 111 289 110 101 100 011 010 001 000 46 86 126 166 206 246 286 Voltage trip points do not include diode drops ´ = RMS RMS CS IN 120 V 2.3V R P TPS92411, TPS92411P SLUSBQ6 – OCTOBER 2013 www.ti.com (3) TYPICAL OPERATION (230-VAC APPLICATION) In the 230-V application shown in Figure 11, the highest efficiency can be obtained by using a high-voltage total LED stack to reduce losses in the linear regulator FET. The best current sharing between stacks can be achieved by using the lowest voltage stack at the bottom and making each stack voltage above that two times that of the stack below it (as in described in the 120-V application). In this example, very good results can be obtained by setting the lowest stack at 40 V, the middle stack at 80 V, and adding a high-voltage cascode FET with the top stack and using 160 V. Use the RSNS pin to set a low voltage point so that when the VS pin of the device falls below this threshold (either from the AC line falling or a higher voltage stack switch above it turning OFF) the TPS92411 switch turns ON and bypasses the LEDs. During the ON-time, the capacitor supplies current to the LEDs. The RSET voltage threshold for a 230-V application is generally set to approximately 8 V to 12 V above the LED stack voltage connected across the TPS92411. This threshold is higher than in the typical 120-V application to allow more headroom. 230-VAC Application Stack Setting Example • Set VRSNS for all three TPS92411 devices at 6 V • Set VRSET for the bottom stack at 49 V • Set VRSET for the middle stack at 89 V • Set VRSET for the top stack at 169 V Switching order as the rectified AC line voltage increases is shown in Table 2. Figure 9 illustrates when each switch turns ON or OFF. Table 2. Switching Order on Rising Edge of the Rectified 230-VAC Waveform(1)(2) STACK TOP 160-V MIDDLE 80-V BOTTOM 40-V 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 (1) 0 denotes switch ON and LEDs bypassed and supplied by the capacitor. (2) 1 denotes switch OFF and LEDs conducting from the line, capacitor charging up. Figure 9. Switching Order on Rising Edge of the Rectified 230-VAC Waveform 10 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Product Folder Links: TPS92411 TPS92411P |
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