The LT3590ESC8 is a fixed frequency buck mode converter specifically designed to drive up to 10 LEDs in series from a 48V DC source. Series connection of the LEDs provides identical LED currents of up to 50mA, resulting in uniform brightness and eliminating the need for ballast resistors. A fixed frequency, current mode architecture results in stable operation over a wide range of input voltage and output voltage.
The high switching frequency of 850kHz permits the use of tiny, low profile inductors and capacitors. A single pin performs both shutdown and accurate LED dimming control. The power switch, Schottky diode and control circuitry are all contained inside a space saving SC70 package or 2mm × 2mm DFN package to allow a small converter footprint and lower parts cost.
Feature
- 4.5V to 55V Input Voltage Range
- Up to 50mA LED Current
- 80mA, 55V Switch
- Internal Schottky Diode
- 15µA Supply Current in Shutdown
- 500µA Supply Current Operating, Not Switching
- Switching Frequency: 850kHz
- 200mV Feedback Voltage with ±5% Accuracy
- CTRL Input Performs Dimming and Shutdown
- 91% Efficiency (10 LEDs, 50mA)
- Requires Only 1µF Output Capacitor
- 8-Lead SC70 Package
- 6-Lead 2mm × 2mm DFN Package
Applications
- LED Fixed Signage
- Traffic Signs
- Neon Sign Replacement
(Picture: Pinout)
