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LM3445 Datasheet PDF

Part Series:LM3445 Series
Category:LED Drivers
Description:TEXAS INSTRUMENTS LM3445MM/NOPB LED Driver, Buck (Step Down), 8-12V input, 1 Output, 5.85kHz switch-freq., 100V/1A out, MSOP-10
Document:LM3445MMX/NOPB Datasheet PDF (44 Pages)

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LM3445MM/NOPB - TI Specifications

TYPE
DESCRIPTION
Mounting Style
Surface Mount
Frequency
30kHz ~ 1MHz
Number of Pins
10 Pin
Case/Package
MSOP-10
Number of Outputs
1 Output
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LM3445MM/NOPB - TI Function Overview

The LM3445 is an adaptive constant off-time AC/DC buck (step-down) constant current controller designed to be compatible with TRIAC dimmers. The LM3445 provides a constant current for illuminating high power LEDs and includes a TRIAC dim decoder. The dim decoder allows wide range LED dimming using standard TRIAC dimmers. The high frequency capable architecture allows the use of small external passive components. The LM3445 includes a bleeder circuit to ensure proper TRIAC operation by allowing current flow while the line voltage is low to enable proper firing of the TRIAC. A passive PFC circuit ensures good power factor by drawing current directly from the line for most of the cycle, and provides a constant positive voltage to the buck regulator. Additional features include thermal shutdown, current limit and VCC under-voltage lockout.
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