Datasheet LT3592 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | 500mA Wide Input Voltage Range Step-Down LED Driver with 10:1 Dimming |
| 页数 / 页 | 24 / 1 — FEATURES. DESCRIPTION. Wide Input Voltage Range. Operation from 3.6V to … |
| 文件格式/大小 | PDF / 323 Kb |
| 文件语言 | 英语 |
FEATURES. DESCRIPTION. Wide Input Voltage Range. Operation from 3.6V to 36V. Resistor Adjustable 400kHz–2.2MHz Switching
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LT3592 500mA Wide Input Voltage Range Step-Down LED Driver with 10:1 Dimming
FEATURES DESCRIPTION
n
Wide Input Voltage Range
The LT®3592 is a fi xed frequency step-down DC/DC con-
Operation from 3.6V to 36V
verter designed to operate as a constant-current source. n
Resistor Adjustable 400kHz–2.2MHz Switching
An external sense resistor monitors the output current
Frequency
allowing accurate current regulation, ideal for driving n
Shorted and Open LED Protected
high current LEDs. The output current can be dimmed n
Internal Switch Current Sense Resistor
by a factor of 10 using an external signal for nighttime n
External Resistor Programs LED Current, Pin
brake lights.
Selects 10:1 Ratio
The high switching frequency offers several advantages by n 50mA/500mA LED Current Settings permitting the use of a small inductor and small ceramic n Catch Diode Current Sense to Prevent Runaway at capacitors. Small components combined with the LT3592’s High VIN 10-pin DFN leadless surface mount package save space and n Small Thermally Enhanced 10-Lead DFN cost versus alternative solutions. The constant switching (2mm × 3mm) and MSOP-10 Packages frequency combined with low-impedance ceramic capaci- tors result in low, predictable output ripple.
APPLICATIONS
A wide input voltage range of 3.6V to 36V makes the n LT3592 useful in a variety of applications. Current mode Automotive Signal Lighting n PWM architecture provides fast transient response and Industrial Lighting n cycle-by-cycle current limiting. Thermal shutdown provides Constant-Current, Constant Voltage Supplies additional protection. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION 50/500mA Two Series Red LED Driver Effi ciency for 2 Red LEDs, L = 10μH, 900kHz
100 VIN VIN BOOST 7V TO 32V 95 1μF LT3592 0.1μF 10μH 90 SW BRIGHT 500mA 85 DA 80 CAP 75 SHDN + ON 200/20mV 0.4Ω 4.7μF 70 – BRAKE BRIGHT OUT EFFICIENCY (%) 65 51k RT 60 VFB GND 140k 55 10k 900kHz 50 4 8 12 16 20 24 28 3592 TA01a INPUT VOLTAGE (V) 3592 TA01b 3592fc 1
FEATURES DESCRIPTION
n
Wide Input Voltage Range
The LT®3592 is a fi xed frequency step-down DC/DC con-
Operation from 3.6V to 36V
verter designed to operate as a constant-current source. n
Resistor Adjustable 400kHz–2.2MHz Switching
An external sense resistor monitors the output current
Frequency
allowing accurate current regulation, ideal for driving n
Shorted and Open LED Protected
high current LEDs. The output current can be dimmed n
Internal Switch Current Sense Resistor
by a factor of 10 using an external signal for nighttime n
External Resistor Programs LED Current, Pin
brake lights.
Selects 10:1 Ratio
The high switching frequency offers several advantages by n 50mA/500mA LED Current Settings permitting the use of a small inductor and small ceramic n Catch Diode Current Sense to Prevent Runaway at capacitors. Small components combined with the LT3592’s High VIN 10-pin DFN leadless surface mount package save space and n Small Thermally Enhanced 10-Lead DFN cost versus alternative solutions. The constant switching (2mm × 3mm) and MSOP-10 Packages frequency combined with low-impedance ceramic capaci- tors result in low, predictable output ripple.
APPLICATIONS
A wide input voltage range of 3.6V to 36V makes the n LT3592 useful in a variety of applications. Current mode Automotive Signal Lighting n PWM architecture provides fast transient response and Industrial Lighting n cycle-by-cycle current limiting. Thermal shutdown provides Constant-Current, Constant Voltage Supplies additional protection. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION 50/500mA Two Series Red LED Driver Effi ciency for 2 Red LEDs, L = 10μH, 900kHz
100 VIN VIN BOOST 7V TO 32V 95 1μF LT3592 0.1μF 10μH 90 SW BRIGHT 500mA 85 DA 80 CAP 75 SHDN + ON 200/20mV 0.4Ω 4.7μF 70 – BRAKE BRIGHT OUT EFFICIENCY (%) 65 51k RT 60 VFB GND 140k 55 10k 900kHz 50 4 8 12 16 20 24 28 3592 TA01a INPUT VOLTAGE (V) 3592 TA01b 3592fc 1