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Technical Specifications
Parameters and characteristics for this part
| Specification | LM3445MX/NOPB |
|---|---|
| Applications | Lighting |
| Dimming | TRIAC |
| Frequency [Max] | 1 MHz |
| Frequency [Min] | 30 kHz |
| Internal Switch(s) | False |
| Mounting Type | Surface Mount |
| Number of Outputs | 1 |
| Operating Temperature [Max] | 125 ¯C |
| Operating Temperature [Min] | -40 °C |
| Package / Case | 14-SOIC |
| Package / Case [x] | 0.154 in |
| Package / Case [y] | 3.9 mm |
| Topology | Step-Down (Buck) |
| Type | AC DC Offline Switcher |
| Voltage - Supply (Max) [Max] | 12 V |
| Voltage - Supply (Min) [Min] | 8 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Cut Tape (CT) | 1 | $ 1.00 | |
| 10 | $ 0.89 | |||
| 25 | $ 0.85 | |||
| 100 | $ 0.70 | |||
| 250 | $ 0.65 | |||
| 500 | $ 0.58 | |||
| 1000 | $ 0.45 | |||
| Digi-Reel® | 1 | $ 1.00 | ||
| 10 | $ 0.89 | |||
| 25 | $ 0.85 | |||
| 100 | $ 0.70 | |||
| 250 | $ 0.65 | |||
| 500 | $ 0.58 | |||
| 1000 | $ 0.45 | |||
| Tape & Reel (TR) | 2500 | $ 0.46 | ||
| 5000 | $ 0.43 | |||
| 7500 | $ 0.42 | |||
| 12500 | $ 0.40 | |||
| 17500 | $ 0.39 | |||
| 25000 | $ 0.38 | |||
| Texas Instruments | LARGE T&R | 1 | $ 0.67 | |
| 100 | $ 0.56 | |||
| 250 | $ 0.40 | |||
| 1000 | $ 0.30 | |||
Description
General part information
LM3445 Series
The LM3445 is an adaptive constant off-time AC/DC buck (step-down) constant current controller designed to be compatible with TRIAC dimmers. The LM3445 provides a constant current for illuminating high power LEDs and includes a TRIAC dim decoder. The dim decoder allows wide range LED dimming using standard TRIAC dimmers. The high frequency capable architecture allows the use of small external passive components. The LM3445 includes a bleeder circuit to ensure proper TRIAC operation by allowing current flow while the line voltage is low to enable proper firing of the TRIAC. 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 VCCunder-voltage lockout.
The LM3445 is an adaptive constant off-time AC/DC buck (step-down) constant current controller designed to be compatible with TRIAC dimmers. The LM3445 provides a constant current for illuminating high power LEDs and includes a TRIAC dim decoder. The dim decoder allows wide range LED dimming using standard TRIAC dimmers. The high frequency capable architecture allows the use of small external passive components. The LM3445 includes a bleeder circuit to ensure proper TRIAC operation by allowing current flow while the line voltage is low to enable proper firing of the TRIAC. 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 VCCunder-voltage lockout.
Documents
Technical documentation and resources
