交流/直流離線式 LED 驅動器
| Input voltage (type) | AC/DC |
| Topology | Buck, Flyback |
| Vin (Min) (V) | 8 |
| Vin (Max) (V) | 13 |
| Iout (Max) (A) | 2 |
| Iq (Typ) (mA) | 1.58 |
| Features | Adjustable Switch Frequency, Thermal Shutdown |
| Operating temperature range (C) | -40 to 125 |
| Dimming method | Analog |
- Application Voltage Range: 80 VAC to 277 VAC
- Capable of Controlling LED Currents
Greater than 1 A - Adjustable Switching Frequency
- Low Quiescent Current
- Adaptive Programmable Off-Time Allows for
Constant Ripple Current - Thermal Shutdown
- No Flicker at 120 Hz
- Low-Profile 10-Pin VSSOP Package
or 8-Lead SOIC Package - Patented Drive Architecture
The LM3444 is an adaptive constant off-time AC/DC buck (step-down) constant current controller that provides a constant current for illuminating high power LEDs. The high-frequency capable architecture allows the use of small external passive components. 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 undervoltage lockout. The LM3444 is available in a low profile 10-pin VSSOP package or an 8-lead SOIC package.
