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LM3466 数据表(PDF) 9 Page - Texas Instruments

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部件名 LM3466
功能描述  Multi-String LED Current Balancer for Use with Constant-Current Power Supplies
Download  23 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM3466 数据表(HTML) 9 Page - Texas Instruments

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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
Ÿ
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
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