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LM3466 Datasheet(PDF) 11 Page - Texas Instruments

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Part # LM3466
Description  Multi-String LED Current Balancer for Use with Constant-Current Power Supplies
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3466 Datasheet(HTML) 11 Page - Texas Instruments

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LM3466
www.ti.com
SNOSB96F – JUNE 2011 – REVISED NOVEMBER 2013
Figure 16. External MOSFET Circuit for High
Figure 17. Power Supply Circuit for the External
Voltage Applications
MOSFET Circuit
Thermal Protection
Thermal protection is implemented by an internal thermal shutdown circuit which activates at 150°C (typically) to
disable the LM3466. In this case, the integrated power MOSFET turns off and the COMM pin is pulled low.
Thermal protection helps prevent catastrophic failures from accidental device overheating. When the junction
temperature of the LM3466 falls back below 140°C (typical hysteresis = 10°C), the LM3466 resumes normal
operation.
Thermal Latch Off and Derating
If thermal protection cycles for 253 times consecutively, the LM3466 is latched off until power reset.
Thermal derating is required for only the DDA package (but not the NEC package). When fully turned on, the
integrated power MOSFET of the LM3466 is capable of conducting a current of 1.5 A below an ambient
temperature of 100°C. At 125°C, the LM3466 can conduct a current of 1 A without thermal shutdown with a PCB
ground plane copper area of 60 cm2, 2 oz/Cu. Figure 18 shows a thermal derating curve for the minimum
conducting current of a fully turned on LM3466 integrated power MOSFET without thermal shutdown against an
ambient temperature up to 125°C.
Copyright © 2011–2013, Texas Instruments Incorporated
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