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LM3445MM Datasheet(PDF) 2 Page - National Semiconductor (TI) |
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LM3445MM Datasheet(HTML) 2 Page - National Semiconductor (TI) |
2 / 26 page Connection Diagrams Top View 30060303 10-Pin MSOP NS Package Number MUB10A Top View 30060373 14-Pin SOIC NS Package Number M14A Ordering Information Order Number Spec. Package Type NSC Package Drawing Top Mark Supplied As LM3445MM NOPB MSOP-10 MUB10A SULB 1000 Units, Tape and Reel LM3445MMX NOPB MSOP-10 MUB10A SULB 3500 Units, Tape and Reel LM3445M NOPB SOIC-14L M14A LM3445M 55 Units, Rail LM3445MX NOPB SOIC-14L M14A LM3445M 2500 Units, Tape and Reel Pin Descriptions SOIC MSOP Name Description 12 1 ASNS PWM output of the triac dim decoder circuit. Outputs a 0 to 4V PWM signal with a duty cycle proportional to the triac dimmer on-time. 13 2 FLTR1 First filter input. The 120Hz PWM signal from ASNS is filtered to a DC signal and compared to a 1 to 3V, 5.85 kHz ramp to generate a higher frequency PWM signal with a duty cycle proportional to the triac dimmer firing angle. Pull above 4.9V (typical) to tri-state DIM. 14 3 DIM 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 to the DIM pin of other LM3445s or other LED drivers to dim multiple LED circuits simultaneously. 1 4 COFF OFF time setting pin. A user set current and capacitor connected from the output to this pin sets the constant OFF time of the switching controller. 3 5 FLTR2 Second filter input. A capacitor tied to this pin filters the PWM dimming signal to supply a DC voltage to control the LED current. Could also be used as an analog dimming input. 4 6 GND Circuit ground connection. 7 7 ISNS LED current sense pin. Connect a resistor from main switching MOSFET source, ISNS to GND to set the maximum LED current. 8 8 GATE Power MOSFET driver pin. This output provides the gate drive for the power switching MOSFET of the buck controller. 9 9 V CC Input voltage pin. This pin provides the power for the internal control circuitry and gate driver. 10 10 BLDR Bleeder pin. Provides the input signal to the angle detect circuitry as well as a current path through a switched 230 Ω resistor to ensure proper firing of the triac dimmer. 2,5,6,11 - N/C No Connect www.national.com 2 |
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