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TPS92411DDAR Datasheet(PDF) 9 Page - Texas Instruments |
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TPS92411DDAR Datasheet(HTML) 9 Page - Texas Instruments |
9 / 22 page Time 26 46 66 86 106 126 000 001 010 011 100 101 110 111 146 110 101 100 011 010 001 000 24 44 64 84 104 124 144 Voltage trip points do not include diode drops TPS92411, TPS92411P www.ti.com SLUSBQ6 – OCTOBER 2013 TYPICAL OPERATION (120-VAC APPLICATION) For the 120-V application shown in Figure 10 the highest efficiency is obtained by using a high-voltage total LED stack to reduce losses in the linear regulator FET. The best current sharing efficiency between stacks can be achieved by using the lowest voltage stack at the bottom and making each stack voltage above 2 times the voltage of the stack below it. In this example 20-V LEDs are used. This effectively gives the lowest stack a total of 20 V, the middle stack a total of 40 V, and the upper stack a total of 80 V. The RSNS resistor is used to set a low voltage point so that when the VS pin voltage 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 LEDs are supplied current from the capacitor. The RSET voltage is used to set a threshold to detect when the input voltage crosses this threshold it turns OFF the switch and allows the LEDs to conduct current from the line and charge the bypass capacitor. 120-VAC Application Stack Setting Example • Set VRSNS for all three TPS92411 devices at 4 V • Set VRSET for the bottom stack at 26 V • Set VRSET for the middle stack at 46 V • Set VRSET for the top stack at 86 V Switching order as the rectified AC line voltage increases is shown in Table 1. Figure 8 illustrates when each switch turns ON or OFF. Table 1. Switching Order on Rising Edge of Rectified 120-VAC (1)(2) STACK TOP 80-V MIDDLE 40-V BOTTOM 20-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 8. Switching Order on Rectified 120-VAC Waveform The linear regulator in Figure 10 generates a current sense RMS voltage of approximately 2.3 V. The linear regulator RMS current is equal to the input current drawn from the AC line. For example, for a 11.5-W input power system the input current should be approximately 0.095 A and a 24- Ω resistor should be chosen for RCS. Other input power levels (PIN) can be obtained using Equation 3. Copyright © 2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TPS92411 TPS92411P |
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