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LM3466 数据表(PDF) 9 Page - Texas Instruments |
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LM3466 数据表(HTML) 9 Page - Texas Instruments |
9 / 23 page ILED VIN LM3466 SEN SRC VEQ COMM GND RSEN CLED VIN Connect to COMM pin of another LM3466 Connect to VEQ pin of another LM3466 REQ 51.1 CEQ 1 µF CIN Connect to VIN pin of another LM3466 LM3466 www.ti.com SNOSB96F – JUNE 2011 – REVISED NOVEMBER 2013 The LED current of LED string k is reduced, while the LED current of other channels increases. Figure 14 shows a typical example that the variation of LED current on varying RSL,k. Figure 13. A Single LM3466 within a Lighting Figure 14. Variation of ILED vs RSL,k System LED String Disconnect and Reconnect One major advantage of the LM3466 lighting system is that the overall brightness can be maintained even if some LED strings open during operation. If an active LED string is suddenly disconnected, the LM3466 automatically balances the current delivered by the supply IS (i.e. each string increases its LED current in this case) so as to keep IS constant. However, the current balancing occurs only after the LED string is confirmed inactive. Once the string is disconnected, VEQ cycles (goes up and down). If the string remains disconnected for a period of 253 consecutive cycles, the string is confirmed inactive. Consequently, the current of other LED strings increases to balance IS. The output power and the overall brightness of the lighting system can be maintained. If a new LED string connects to the system, such as if the disconnected LED string is reconnected again, a power reset is recommended to ensure proper operation. The forward voltage of the new LED string may be higher than the instantaneous VIN, which corresponds to the forward voltage of the highest active LED string. A power reset ensures that VIN goes to the peak voltage (a default characteristic of a constant current power supply) in order to start up the LED string with the highest forward voltage. Copyright © 2011–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM3466 |
类似零件编号 - LM3466 |
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类似说明 - LM3466 |
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