Texas Instruments LM3447MTX/NOPB AC DC Offline Switcher, Triac dimming, Flyback topology, 19V output, Surface Mount 14-TSSOP, -40°C to 125°C.
| Parameter | Value |
|---|---|
| Type | AC DC Offline Switcher |
| Mounting | Surface Mount |
| Voltage - output | 19V |
| Supply voltage | 17.5V |
| I/O channels | 1 |
| Operating temperature | -40°C ~ 125°C (TJ) |
| Dimming | Triac |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Topology | Flyback |
| Applications | Lighting |
| Case | 14-TSSOP (0.173\", 4.40mm Width) |
| Internal switch | No |
The Texas Instruments LM3447MTX/NOPB is an AC DC offline switcher designed for LED lighting applications, supporting Triac dimming in a flyback topology. It delivers a regulated 19V output from a single channel, with no internal power switch — an external MOSFET handles the switching.
No last-time-buy or end-of-life notice applies here — this is a current-catalog part from Texas Instruments.
The controller is designed to work with standard forward-phase Triac dimmers used in residential and commercial lighting. It senses the dimmer's conduction angle and adjusts the LED current accordingly, maintaining compatibility with existing wall dimmers without additional wiring.