| Vdd(V) | 6-450DC, 85-265AC |
|---|---|
| IOUT | ±3% |
| Solder | Lead-free (RoHS Compliant) |
| Status | Prod |
| Outpack | Tape on Reel |
| Pkg Pin(mm) | SOP-8 |
| Document | T8_EB |
| Efficiency(%) | 95 |
| Temp.Range | Industrial Grade (-40ºC to 85ºC) |
| Driver Type | DC/DC, AC/DC |
| Type | 3918 |
| Product Type | LT = Lighting LED Driver |
| Product Family | 31 = Commercial/Industrial Analog |
| Power Transistor | External |
| Package Type | GR = SOP |
| Solder Type | L = Lead-free (RoHS Compliant) |
| Part Number | 3918 = 3918 |
| Temperature Grade | S2 = Industrial temp. (-40°C to 85°C) |
| Package option | TR = Tape & Reel |
IS31LT3918 LED driver IC is a peak current detection buck converter which operates in constant off time mode. It operates over a very wide input voltage supply range of 6VDC to 450VDC or 110VAC/220VAC. IS31LT3918 incorporates the special feature of switch dimming by detecting OFF-ON cycles of the main power switch. When the switch is cycled within a 2 second period (typical) the device automatically switches the dimming level to the next step. As a result, dimming can be achieved without replacing any wiring in the original system. There are multiple modes of switch dimming that the user may configure 2 steps or 3 steps, as well as different levels of dimming via the external pins DIM1 and DIM2. IS31LT3918 can also realize LED dimming using an external PWM signal. It can accept a PWM signal from 0% to 100% duty cycle. The LED current may also be adjusted linearly by applying an analog input voltage in the range of 0.5V to 2.5V. IS31LT3918 adopts a peak current mode control architecture, which eliminates the need for any additional loop compensation while maintaining a good degree of constant output current regulation.