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LM3445M Datasheet(PDF) 3 Page - Texas Instruments |
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LM3445M Datasheet(HTML) 3 Page - Texas Instruments |
3 / 42 page 1 4 3 2 14 11 12 13 N/C N/C ASNS DIM GND FLTR1 COFF FLTR2 5 10 N/C BLDR 6 N/C 7 ISNS 9 VCC 8 GATE 1 4 3 2 10 7 8 9 ISNS FLTR1 GATE BLDR COFF VCC ASNS DIM 5 6 FLTR2 GND LM3445 www.ti.com SNVS570M – JANUARY 2009 – REVISED NOVEMBER 2015 5 Pin Configuration and Functions DGS Package D Package 10-Pin VSSOP 14-Pin SOIC Top View Top View Pin Functions PIN I/O DESCRIPTION NAME SOIC VSSOP PWM output of the TRIAC dim decoder circuit. Outputs a 0 to 4-V PWM signal ASNS 12 1 O with a duty cycle proportional to the TRIAC dimmer on-time. Bleeder pin. Provides the input signal to the angle detect circuitry as well as a BLDR 10 10 I current path through a switched 230- Ω resistor to ensure proper firing of the TRIAC dimmer. OFF time setting pin. A user set current and capacitor connected from the COFF 1 4 I output to this pin sets the constant OFF time of the switching controller. Input/output dual function dim pin. This pin can be driven with an external PWM signal to dim the LEDs. It may also be used as an output signal and connected DIM 14 3 I/O to the DIM pin of other LM3445s or other LED drivers to dim multiple LED circuits simultaneously. First filter input. The 120-Hz PWM signal from ASNS is filtered to a DC signal and compared to a 1 to 3 V, 5.85-kHz ramp to generate a higher frequency FLTR1 13 2 I PWM signal with a duty cycle proportional to the TRIAC dimmer firing angle. Pull above 4.9-V (typical) to tri-state DIM. Second filter input. A capacitor tied to this pin filters the PWM dimming signal FLTR2 3 5 I to supply a DC voltage to control the LED current. Could also be used as an analog dimming input. Power MOSFET driver pin. This output provides the gate drive for the power GATE 8 8 O switching MOSFET of the buck controller. GND 4 6 — Circuit ground connection LED current sense pin. Connect a resistor from main switching MOSFET ISNS 7 7 I source, ISNS to GND to set the maximum LED current. N/C 2, 5, 6, 11 — — No Connect Input voltage pin. This pin provides the power for the internal control circuitry VCC 9 9 O and gate driver. Copyright © 2009–2015, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM3445 |
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