LM3450MTSLASHNOPB datasheet(17/42 Pages) TI2

tên linh kiện	LM3450MT/NOPB

Giải thích chi tiết về linh kiện	LED Drivers with Active Power Factor Correction and Phase Dimming Decoder

PDF	42 Pages

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nhà sản xuất	TI2 [Texas Instruments]

Trang chủ	https://www.ti.com

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LM3450

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SNVS681D – NOVEMBER 2010 – REVISED MAY 2013

LOW POWER SHUTDOWN

The LM3450/50A can be placed into a low power shutdown by grounding the VADJ pin (any voltage below 75mV).

During low power shutdown, the device will turn on the GATE for one cycle followed by a fixed off-time of 42µs

and the cycle repeats. During shutdown, the DIM output will be high (zero light output) since the buffer rail at

FLT1 will be at or near zero. This feature is designed to hold up the PFC output voltage while removing the load

(turning the LEDs off).

THERMAL SHUTDOWN

Internal thermal shutdown circuitry is provided to protect the IC in the event that the maximum junction

temperature is exceeded. The threshold for thermal shutdown is 160°C with a 20°C hysteresis. During thermal

shutdown GATE is disabled.

Figure 24. Phase Dimming Waveforms

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