| Vdd(V) | 2.7-5.5 |
|---|---|
| IOUT | 500mA±5% |
| Status | Prod |
| Pkg Pin(mm) | SOP-8 |
| Document | Eval Board |
| Efficiency(%) | 90 |
| Driver Type | Constant Current |
| Power Transistor | Built-in |
| Product Family | 31 = Commercial/Industrial Analog |
| Part Number | 3135 = 3135 |
| Product Type | LT = Lighting LED Driver |
| Package option | blank = Tray or Tube |
IS31LT3135 is a main/sub dual-channel LED driver. When the main channel works，it is a constant current source driving the main LED and the current is set by an external resistor connected to the ISET pin. It needs only 0.1v dropout voltage for 200mA output current. When the sub-channel works, the chip will pull down the sub LED’s cathode to ground. Normally there is only one channel on, the main channel and the sub channel can switch between each other. Sweeping power supply from high voltage to low voltage, main channel switches to sub-channel while UV pin is below the undervoltage threshold 1.17V (IS31LT3135-V1 typical) or 1.23V (IS31LT3135-V2 typical). Sweeping power supply from low voltage to high voltage, the sub-channel switches to the main channel while UV pin is 80mV (typical) higher than the undervoltage threshold. Additionally, the main channel has short protection function, when the main LED is shorted，the chip will switch to sub-channel automatically.