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Analog Devices LT3799 | Demoboard DC1775A
LT3799 Demo Board - Offline Isolated Flyback Controller with PFC - Universal Input, VOUT(NOM) = 28V, I LED = 0.5A
Overview
| Topology | Other Topology |
| IC revision | 4 |
Description
Demonstration circuit 1775A is an off-line isolated flyback LED driver featuring the LT®3799. The demo board provides a constant-current output of 0.5A over an LED string voltage of 20V and 30V. It is optimized to operateover a wide AC input voltage range (90VAC to 270VAC). LED current typically stays within ±4% over the whole input voltage range. The DC1775A provides a steep decline in LED current with decreasing TRIAC dimming angle, toachieve a wide TRIAC dimming range. It is designed to comply with IEC 61000-3-2 Class C harmonics standard and EN55015B conducted EMI standard.
The LT3799 controls an isolated flyback converter in boundary mode. Its unique bleeder circuit makes the LED driver compatible with TRIAC dimmers without additional components. Its novel current sensing scheme delivers a well-regulated output current to the secondary side without using an opto-coupler. Open- and shorted-LED protection ensures long-term reliability.
The LT3799 is available in a low profile, thermally-enhanced 16-lead MSOP package.
The LT3799 data sheet gives a complete description of the part, operation and application info rmation. The data sheet must be read in conjunction with this quick start guide for demo circuit 1775A.
Features
Remarks:L1=750uH L2=39mH And Transformer T1 UsedRefer page no.7
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | VIN | VOut1(V) | IOut1(mA) | Vaux(V) | RDC 1(Ω) | RDC 2(Ω) | RDC 3(Ω) | fswitch(kHz) | L(mH) | NPRI : NSEC : NAUX | ISAT(mA) | VT(V (AC)) | L(mm) | W(mm) | H(mm) | Mount | Size | SamplesAvailability & Sample | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | SPECWE-OLLT Offline Flyback Transformers, 85 - 141 V (AC), 11 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLLT Offline Flyback Transformers | Input Voltage 85 - 141 V (AC) | Output Voltage 111 V | Output Current 1350 mA | Auxiliary Voltage15 V | DC Resistance 15.1 Ω | DC Resistance 20.092 Ω | DC Resistance 31.35 Ω | Switching Frequency 100 | Inductance2 mH | Turns Ratio6.67:1:1.67 | Saturation Current270 mA | Insulation Test Voltage4500 V (AC) | Length15 mm | Width15.75 mm | Height18.5 mm | MountTHT | SizeEE13/6/6 | –Check availability | |||
 | SPECWE-OLLT Offline Flyback Transformers, 85 - 265 V (AC), 28 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLLT Offline Flyback Transformers | Input Voltage 85 - 265 V (AC) | Output Voltage 128 V | Output Current 1500 mA | Auxiliary Voltage20 V | DC Resistance 12.4 Ω | DC Resistance 20.241 Ω | DC Resistance 31.55 Ω | Switching Frequency 100 | Inductance0.6 mH | Turns Ratio4:1:0.71 | Saturation Current1750 mA | Insulation Test Voltage4500 V (AC) | Length18.5 mm | Width16.5 mm | Height18.8 mm | MountTHT | SizeEE16/7/5 | –Check availability | |||
 | SPECWE-OLLT Offline Flyback Transformers, 85 - 265 V (AC), 125 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLLT Offline Flyback Transformers | Input Voltage 85 - 265 V (AC) | Output Voltage 1125 V | Output Current 1360 mA | Auxiliary Voltage21.25 V | DC Resistance 10.6 Ω | DC Resistance 20.254 Ω | DC Resistance 30.11 Ω | Switching Frequency 150 | Inductance0.461 mH | Turns Ratio1:1:0.17 | Saturation Current3150 mA | Insulation Test Voltage4500 V (AC) | Length31 mm | Width31 mm | Height25 mm | MountTHT | SizeER28/14 | –Check availability | |||
| SPECWE-OLLT Offline Flyback Transformers, 85 - 265 V (AC), 85 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLLT Offline Flyback Transformers | Input Voltage 85 - 265 V (AC) | Output Voltage 185 V | Output Current 1400 mA | Auxiliary Voltage20 V | DC Resistance 10.55 Ω | DC Resistance 21.23 Ω | DC Resistance 31.1 Ω | Switching Frequency 60 | Inductance0.4 mH | Turns Ratio1:1:0.24 | Saturation Current5700 mA | Insulation Test Voltage4500 V (AC) | Length31 mm | Width31 mm | Height25 mm | MountTHT | SizeER28/14 | –Check availability | |||
 | SPECWE-OLLT Offline Flyback Transformers, 85 - 265 V (AC), 18 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLLT Offline Flyback Transformers | Input Voltage 85 - 265 V (AC) | Output Voltage 118 V | Output Current 15000 mA | Auxiliary Voltage18 V | DC Resistance 10.15 Ω | DC Resistance 20.008 Ω | DC Resistance 30.042 Ω | Switching Frequency 200 | Inductance0.3 mH | Turns Ratio6:1:1 | Saturation Current4000 mA | Insulation Test Voltage4500 V (AC) | Length39.6 mm | Width43.18 mm | Height30.48 mm | MountTHT | SizeETD34 | –Check availability | |||
| SPECWE-OLLT Offline Flyback Transformers, 85 - 265 V (AC), 90 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLLT Offline Flyback Transformers | Input Voltage 85 - 265 V (AC) | Output Voltage 190 V | Output Current 11000 mA | Auxiliary Voltage19.8 V | DC Resistance 10.15 Ω | DC Resistance 20.223 Ω | DC Resistance 30.055 Ω | Switching Frequency 75 | Inductance0.1 mH | Turns Ratio1:1:0.22 | Saturation Current9000 mA | Insulation Test Voltage4500 V (AC) | Length39.6 mm | Width43.18 mm | Height30.48 mm | MountTHT | SizeETD34 | –Check availability | |||
| SPECWE-OLLT Offline Flyback Transformers, 90 - 265 V (AC), 3.4 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLLT Offline Flyback Transformers | Input Voltage 90 - 265 V (AC) | Output Voltage 13.4 V | Output Current 11000 mA | Auxiliary Voltage17 V | DC Resistance 16.25 Ω | DC Resistance 20.016 Ω | DC Resistance 31.7 Ω | Switching Frequency 100 | Inductance2 mH | Turns Ratio20:1:5 | Saturation Current350 mA | Insulation Test Voltage4500 V (AC) | Length15 mm | Width15.75 mm | Height18.5 mm | MountTHT | SizeEE13/6/6 | –Check availability | |||
| SPECWE-OLLT Offline Flyback Transformers, 90 - 265 V (AC), 14 V | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-OLLT Offline Flyback Transformers | Input Voltage 90 - 265 V (AC) | Output Voltage 114 V | Output Current 11000 mA | Auxiliary Voltage18 V | DC Resistance 11.85 Ω | DC Resistance 20.06 Ω | DC Resistance 31.35 Ω | Switching Frequency 100 | Inductance0.6 mH | Turns Ratio8:1:1.29 | Saturation Current1750 mA | Insulation Test Voltage4500 V (AC) | Length18 mm | Width16.5 mm | Height18 mm | MountTHT | SizeEE16/7/5 | –Check availability |
Availability Forecast
WE item number Packaging unitsLead time
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|---|---|---|
| Current Availability | – | – |
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