sc4541 Semtech Corporation, sc4541 Datasheet
sc4541
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sc4541 Summary of contents
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... A logic level PWM dimming signal may be applied directly to the enable (EN) pin - for direct PWM dimming with a wide dimming range. Output OVP (over voltage protec- tion) protects the SC4541 from open circuit faults in the LED string or connector. External OVP programming resistors are not required. ...
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... Pin Configuration, MLPD-UT6 IN 1 TOP VIEW 2 GND MLPD-UT 2(mm) 6 Lead θ = 75º C/W JA Marking Information, MLPD-UT6 FR7 = Code for SC4541 EW = Datecode Ordering Information Device SC4541SKTRT (1,2) SC4541ULTRT 0.6(mm) MLPD-UT6 (1,2) SC4541EVB-1 Evaluation Board, SOT23-6 SC4541EVB-2 Evaluation Board, MLPD-UT6 Notes: (1) Available in tape and reel only. A reel contains 3,000 devices. ...
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... OUT FB I EN=0V IN(SHDN) V EN(H) V EN( EN(L), EN( MAX I LIMIT 18V 0.2A SAT =25°C OUT(OVP 100mA, T =25°C F(D) OUT A SC4541 (2) Min Typ Max Units 2 1 µ 0 µA 1.6 2.0 2.4 MHz 84 % 260 350 450 mA 0.1 5 µA 200 mV 25.5 28 ...
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Electrical Characteristics (continued) Parameter Boost Converter Characteristics (continued) Schottky Leakage Current Current Sink Characteristics LED Current Sense Voltage ( OUT FB OUT Pin Bias Current FB Pin Bias Current Common Mode Voltage OUT FB Symbol ...
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... VIN = 10V 2.0 1.6 1.2 0.8 0.4 0.0 -40 25 Temperature ( Switching Frequency 2.4 VIN = 5V VIN = 12V VIN = 22V 2.2 2.0 1.8 1.6 -40 25 Temperature ( Switch Leakage Current V = 10V SW 2.0 1.6 1.2 0.8 0.4 0.0 -40 25 Temperature ( 500 400 300 200 100 30.0 25.0 20.0 15.0 10 SC4541 Switch Current Limit 25 Temperature ( C) o Output Over Voltage Protection 25 Temperature ( ...
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... Typical Characteristics (continued) Schottky Forward Drop 1.0 0.8 FB (SS302R2) 0.6 0.4 0.2 0.0 -40 25 Temperature ( LED Current Sense Voltage(FB) 210 VIN = 5V VIN = 12V VIN = 22V 205 VOUT = 18V 200 195 190 -40 25 Temperature ( V 1.0 0.8 0.6 0.4 0.2 0 Schottky Leakage Current = 20V SCHT 25 Temperature ( SC4541 85 6 ...
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... SW Start up By PWM VOUT (50mV/div VIN Fluctuation - Rising VIN VOUT SW Shut Down Test condition: 5Vin, LEDs=6S1P, R1=10Ω Ω Ω Ω , SC4541(1120) VIN (2.5V/div) VOUT (5V/div) IL (0.2A/div) VSW (10V/div) Time (5mS/div) Main Power Switching Test condition: 5Vin, LEDs=6S1P, R1=10Ω, SC4541(1120) VIN ...
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... Typical Characteristics (continued) Conditions 20mA ,6 LEDs in series Over Voltage Protection Test condition: 5Vin, LEDs=6S1P, R1=10Ω Ω Ω Ω , SC4541(1120) VIN (3V/div) VOUT (5V/div) IL (0.4A/div) VSW (10V/div) Time (0.1mS/div) Test condition: 5Vin, LEDs=6S1P, R1=10Ω Ω Ω Ω , PWM Dimming (50% duty cycle) SC4541(1120) , PWM Dimming 300Hz, 50% duty ...
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... Pad for heat sinking purposes — connect to the external ground plane using multiple vias when using MLPD-UT6 package. Not electrically connected internally. The SOT23-6 does not have a thermal pad. PWM - Slope Osc Comp 2MHz + OVP + 1.25V - SC4541 SENSE OUT GND FB 9 ...
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... Schottky diode and charges up the output capacitor connected to OUT. The Schottky diode inside the SC4541 can sustain a maximum current of 1A. Programming the LED Current The circuit will maintain the necessary output voltage to ensure 200mV across OUT and FB pins ...
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Applications Information ( continued) The converter has higher efficiency under CCM and the inductor peak current is calculated by the following equation PEAK Assuming CCM, the duty ratio ...
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... Figure 1 — Typical Application Schematic, Boost Topology 85% 5Vin, 10uH(A915AY-100M) 80% 75% 70% 65% 60% 55% 50 Iout(mA) The following design rules are recommended: • • R5 10KΩ SC4541 1μF OUT 16V GND SW FB EDP 82% 80% 78% 76% 3S1P 4S1P 74% 5S1P 6S1P 72% 7S1P 8S1P 70 ...
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... 12Vin, 2LED, Buck topology 100 120 140 Output Current(mA) Efficiency (Buck, High < High Efficiency Option > 12Vin, 2LED, Buck topology 100 120 140 Output Current(mA) SC4541 Efficiency 160 180 200 160 180 200 13 ...
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... LED26 LED25 LEDs: EVERLIGHT EHP-109/UB31H-PU5/TR L1: Murata LQH3NPN100NG0L C1, C2, C5: Murata GRM21BR71H105K Figure 4 — Typical Application Schematic, Floating Buck-Boost Topology R5 10K VIN 22V 1uF SC4541 GND L1 SW 22uH C5 4.7uF LED9 LED10 LEDs: EVERLIGHT EHP-109/UB31H-PU5/TR L1: Cooper SD52-220-R C1, C2: Murata GRM21BR71H105K C5: Murata GRM31CR71H475K Figure 5 — ...
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... Applications Information ( continued) (TOP layer) Figure 4 — Typical PCB Layout SC4541 (Bottom layer) 15 ...
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... A1 .000 .007 D .075 D1 .061 .075 E E1 .026 .010 N SEATING aaa PLANE bbb bxN bbb SC4541 DIMENSIONS INCHES MILLIMETERS NOM MAX MIN NOM MAX - - .024 0.50 0. .002 0.00 0.05 (.006) (0.152) .010 .012 0.18 0.25 0.30 .079 .083 1.90 2.00 2.10 .067 .071 1.55 1 ...
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Land Pattern — 2x2 MLPD-UT6 NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ...
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... TO BE DETERMINED AT DATUM PLANE DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. DIMENSIONS DIM DIMENSIONS MILLIMETERS MIN NOM MAX - 0.90 1.45 - 0.00 0.15 0.90 1.15 1.30 - 0.25 0.50 0.08 - 0.22 2.80 2.90 3.10 1.50 1.60 1.75 2.80 BSC 0.95 BSC 1.90 BSC 0.30 0.45 0.60 (0.60 0° 10° 0.10 0.20 0. (L1) A DETAIL -H- MILLIMETERS (2.50) 1.40 0.95 0.60 1.10 3.60 SC4541 18 ...
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... Semtech and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs damages and attorney fees which could arise. Contact Information Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805) 498-2111 Fax: (805) 498-3804 www.semtech.com SC4541 19 ...