lt3590 Linear Technology Corporation, lt3590 Datasheet
lt3590
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lt3590 Summary of contents
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... LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 100 90 50mA 80 70 470μ 3590 TA01a 40 LT3590 48V Buck Mode Conversion Effi ciency LED CURRENT (mA) 3590 TA01b 3590f ...
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... TAPE AND REEL LT3590EDC#PBF LT3590EDC#TRPBF LT3590ESC8#PBF LT3590ESC8#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: For more information on tape and reel specifi cations, go to: 2 Maximum Junction Temperature........................... 125° ...
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... Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LT3590E is guaranteed to meet performance specifi cations from 0°C to 85°C junction temperature. Specifi cations over the –40°C to 85°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls ...
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... LT3590 TYPICAL PERFORMANCE CHARACTERISTICS Switch Saturation Voltage (V ) CESAT 0.8 0.7 –40°C 0.6 125°C 0.5 25°C 0.4 0.3 0 SWITCH CURRENT (mA) 3590 G01 Shutdown Quiescent Current vs Temperature CTRL V = 48V –50 – 100 TEMPERATURE (°C) 3590 G04 Switching Waveform I L 20mA/DIV ...
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... CTRL 3. LED 3. 3.3V CTRL I = 50mA LED 3.25 3. 0.2 0.4 0.6 0.8 I (mA) LOAD LT3590 Switching Current Limit vs Temperature 150 140 130 120 110 100 90 80 –50 – 100 TEMPERATURE (°C) 3590 G10 Switching Frequency over Temperature 1000 V = 48V IN 950 900 850 ...
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... LT3590 PIN FUNCTIONS (SC70/DFN) SW (Pin 1/Pin 3): Switch Pin. Minimize trace area at this pin to minimize EMI. Connect the inductor at this pin. GND (Pins 2, 3, 4/Pin 2): Ground Pins. All ground pins should be tied directly to local ground plane. Proper soldering of these pins to the PCB ground is required to achieve the rated thermal performance ...
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... Input Voltage Range The minimum input voltage required to generate a particular output voltage in an LT3590 application is limited by either its 4.5V limit or by its maximum duty cycle. The duty cycle is the fraction of time that the internal switch is on and is determined by the input and output voltages: ...
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... Capacitor Selection The small size of ceramic capacitors make them ideal for LT3590 applications. X5R and X7R types are recom- mended because they retain their capacitance over wider voltage and temperature ranges than other types such as Y5V or Z5U. A 1μF input capacitor and a 0.1μF regulator capacitor are suffi ...
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... CTRL pin which is 100kΩ. kHz TYP Figure 5. Dimming Control Using a Filtered PWM Signal 1.5 2.0 3590 F04 LT3590 200mV > 1.5V ,when V CTRL R1 V CTRL < 1.25V ,when V CTRL 6.25 • R1 LT3590 R1 10k PWM CTRL C1 1μF 3590 F05 3590f 9 ...
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... LT3590 APPLICATIONS INFORMATION Direct PWM Dimming Changing the forward current fl owing in the LEDs not only changes the intensity of the LEDs, it also changes the color. The chromaticity of the LEDs changes with the change in forward current. Many applications cannot tolerate any shift in the color of the LEDs. Controlling the intensity of the LEDs with a direct PWM signal allows dimming of the LEDs without changing the color ...
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... The LT3590 has a 3.3V onboard voltage regulator capable of sourcing up to 1mA of current for use by an external device. This feature may be used to power-up a controller from the LT3590. The 3.3V is available even during shut- down required to place a 0.1μF capacitor from V to ground. The regulator current is limited to 1.5mA. ...
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... GND 0.1μF L1: MURATA LQH32CN-391 24V Supply for a 5 LED String, 30mA Current C2 1μF R1 6.8Ω 24V C1 1μF V LED IN CONTROL CTRL >1.5V LT3590 VREG SW C3 GND 0.1μF L1: MURATA LQH32CN-221 12 C2 1μF 50mA 6 LEDs L1 470μH 3590 TA02a 30mA L1 470μH 3590 TA03a ...
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... LT3590 VREG SW C3 GND 0.1μF L1: MURATA LQH32CN-221 50mA L1 220μH 3590 TA05a 25mA 25mA L1 470μH 3590 TA06a C2 50mA L1 220μH 3590 TA07a LT3590 Conversion Effi ciency 80 75 12V 70 65 24V LED CURRENT (mA) 3590 TA05b Conversion Effi ciency ...
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... LT3590 PACKAGE DESCRIPTION 2.50 ±0.05 0.61 ±0.05 1.15 ±0.05 (2 SIDES) 0.50 BSC 1.42 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WCCD-2) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5 ...
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... MAX 0.10 – 0.18 (NOTE 3) 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. DETAILS OF THE PIN 1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE INDEX AREA 7. EIAJ PACKAGE REFERENCE IS EIAJ SC-70 AND JEDEC MO-203 VARIATION BA LT3590 1.80 – 2.20 (NOTE 4) PIN 8 INDEX AREA (NOTE 6) 0.15 – 0.27 8 PLCS (NOTE 3) 0.00 – ...
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... R1 4Ω 24V C1 1μF V LED IN CONTROL CTRL >1.5V LT3590 VREG SW C3 GND 0.1μF L1: MURATA LQH32CN-221 RELATED PARTS PART NUMBER DESCRIPTION LT1932 Constant Current, 1.2MHz, High Effi ciency White LED Boost Regulator LT3003 Three Channel LED Ballaster with PWM Dimming LT3465/A Constant Current, 1.2/2.7MHz, High Effi ...