Datasheet LT3590 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | 48V Buck Mode LED Driver in SC70 and 2mm × 2mm DFN |
| 页数 / 页 | 16 / 1 — FEATURES. DESCRIPTION. 4.5V to 55V Input Voltage Range. Up to 50mA LED … |
| 文件格式/大小 | PDF / 237 Kb |
| 文件语言 | 英语 |
FEATURES. DESCRIPTION. 4.5V to 55V Input Voltage Range. Up to 50mA LED Current. 80mA, 55V Switch. Internal Schottky Diode
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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