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LM3447 Datasheet(PDF) 10 Page - Texas Instruments |
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LM3447 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 25 page VAC TSNS LM3447 FLT1 FLT2 BIAS HOLD AUX VCC FF INV COMP GATE ISNS GND + – + – R AC C PFC C FLT R FLT RFF R NTC C FF C COMP R BS RHLD1 R HLD2 C VCC R SN R AUX1 R AUX2 Q PASS Q SW C BULK R O PRI SEC N P N S NA AUX C Y1 n:1 LM3447 SNOSC65 A – APRIL 2012 – REVISED MAY 2012 www.ti.com Figure 18. Typical Primary Side Power Regulated Flyback LED Driver APPLICATION INFORMATION DESCRIPTION LM3447 is an AC-DC power factor correction (PFC) controller for phase-cut dimmer compatible LED lighting applications. The device incorporates an innovative primary side input power regulation technique for controlling the LED light output over a wide input AC voltage and ambient temperature range. Operating LEDs with constant power allows the controller to compensates for the LED forward voltage variations caused by temperature modulation and LED aging. This also provides improved lamp lumen output maintenance and higher luminous efficacy. Smooth, flicker free LED dimming is performed by varying the power regulation set-point based on the dimmer phase angle. The device includes internal angle detection and decoding circuitry to accurately interpret the phase angle from a forward phase (leading edge) and reverse phase (trailing edge) based dimmers Power factor correction (PFC) with low input current total harmonic distortion (THD) is maintained by forcing discontinuous conduction mode (DCM) using a trimmed internal oscillator and valley detect circuitry. These features, along with LED open circuit and short circuit protection, LED thermal foldback and cycle-by-cycle FET overcurrent protection, make the LM3447 an ideal device for implementing a compact single stage isolated Flyback AC-DC LED driver for 5–30W power output range. In addition, it is also possible to configure LM3447 with minor modifications to control SEPIC and Cúk based dimmable AC-DC PFC LED drivers. In this datasheet, a discussion of the LM3447 functionality is presented using a typical Flyback LED driver circuit, as shown in Figure 18. 10 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: LM3447 |
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