Datasheet LT3590 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 48V Buck Mode LED Driver in SC70 and 2mm × 2mm DFN |
| Pages / Page | 16 / 1 — FEATURES. DESCRIPTION. 4.5V to 55V Input Voltage Range. Up to 50mA LED … |
| File Format / Size | PDF / 237 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. 4.5V to 55V Input Voltage Range. Up to 50mA LED Current. 80mA, 55V Switch. Internal Schottky Diode
Model Line for this Datasheet
Text Version of Document
LT3590 48V Buck Mode LED Driver in SC70 and 2mm x 2mm DFN
FEATURES DESCRIPTION
■
4.5V to 55V Input Voltage Range
The LT®3590 is a fi xed frequency buck mode converter ■
Up to 50mA LED Current
specifi cally designed to drive up to 10 LEDs in series from ■
80mA, 55V Switch
a 48V DC source. Series connection of the LEDs provides ■
Internal Schottky Diode
identical LED currents of up to 50mA, resulting in uniform ■ 15μA Supply Current in Shutdown brightness and eliminating the need for ballast resistors. ■ 500μA Supply Current Operating, Not Switching A fi xed frequency, current mode architecture results in ■ Switching Frequency: 850kHz stable operation over a wide range of input voltage and ■ 200mV Feedback Voltage with ±5% Accuracy output voltage. ■ CTRL Input Performs Dimming and Shutdown The high switching frequency of 850kHz permits the use ■ 91% Effi ciency (10 LEDs, 50mA) of tiny, low profi le inductors and capacitors. A single pin ■ Requires Only 1μF Output Capacitor performs both shutdown and accurate LED dimming ■ 8-Lead SC70 Package control. The power switch, Schottky diode and control ■ 6-Lead 2mm × 2mm DFN Package circuitry are all contained inside a space saving SC70 package or 2mm × 2mm DFN package to allow a small
APPLICATIONS
converter footprint and lower parts cost. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ■ LED Fixed Signage All other trademarks are the property of their respective owners. ■ Traffi c Signs ■ Neon Sign Replacement
TYPICAL APPLICATION Buck Mode Driver for Ten White LEDs Conversion Effi ciency
1μF 100 50mA 90 4Ω V 80 IN 48V 1μF V 70 IN LED CONTROL CTRL 470μH EFFICIENCY (%) 60 LT3590 VREG SW 50 3590 TA01a 0.1μF GND 40 0 10 20 30 40 50 LED CURRENT (mA) 3590 TA01b 3590f 1
FEATURES DESCRIPTION
■
4.5V to 55V Input Voltage Range
The LT®3590 is a fi xed frequency buck mode converter ■
Up to 50mA LED Current
specifi cally designed to drive up to 10 LEDs in series from ■
80mA, 55V Switch
a 48V DC source. Series connection of the LEDs provides ■
Internal Schottky Diode
identical LED currents of up to 50mA, resulting in uniform ■ 15μA Supply Current in Shutdown brightness and eliminating the need for ballast resistors. ■ 500μA Supply Current Operating, Not Switching A fi xed frequency, current mode architecture results in ■ Switching Frequency: 850kHz stable operation over a wide range of input voltage and ■ 200mV Feedback Voltage with ±5% Accuracy output voltage. ■ CTRL Input Performs Dimming and Shutdown The high switching frequency of 850kHz permits the use ■ 91% Effi ciency (10 LEDs, 50mA) of tiny, low profi le inductors and capacitors. A single pin ■ Requires Only 1μF Output Capacitor performs both shutdown and accurate LED dimming ■ 8-Lead SC70 Package control. The power switch, Schottky diode and control ■ 6-Lead 2mm × 2mm DFN Package circuitry are all contained inside a space saving SC70 package or 2mm × 2mm DFN package to allow a small
APPLICATIONS
converter footprint and lower parts cost. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ■ LED Fixed Signage All other trademarks are the property of their respective owners. ■ Traffi c Signs ■ Neon Sign Replacement
TYPICAL APPLICATION Buck Mode Driver for Ten White LEDs Conversion Effi ciency
1μF 100 50mA 90 4Ω V 80 IN 48V 1μF V 70 IN LED CONTROL CTRL 470μH EFFICIENCY (%) 60 LT3590 VREG SW 50 3590 TA01a 0.1μF GND 40 0 10 20 30 40 50 LED CURRENT (mA) 3590 TA01b 3590f 1
