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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 | Flyback Converter |
| Input voltage | 90-270 V |
| Output 1 | 28 V / 0.5 A |
| 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(A) | Vaux(V) | RDC 1(Ω) | RDC 2(Ω) | RDC 3(Ω) | fswitch(kHz) | NPRI : NSEC : NAUX | ISAT(mA) | Size | IR(A) | L(mH) | RDC max.(mΩ) | VR(V (AC)) | VT(V (AC)) | Material | L(mm) | W(mm) | H(mm) | Mount | SamplesAvailability & Sample | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 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 11 A | Auxiliary Voltage17 V | DC Resistance 16.25 Ω | DC Resistance 20.016 Ω | DC Resistance 31.7 Ω | Switching Frequency 100 | Turns Ratio20:1:5 | Saturation Current350 mA | SizeEE13/6/6 | – | Inductance2 mH | – | – | Insulation Test Voltage4500 V (AC) | – | Length15 mm | Width15.75 mm | Height18.5 mm | MountTHT | –Check availability | |||
 | SPECWE-OLLT Offline Flyback Transformers, 90 - 265 V (AC), 28 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 128 V | Output Current 10.5 A | Auxiliary Voltage24 V | DC Resistance 11.34 Ω | DC Resistance 20.058 Ω | DC Resistance 32 Ω | Switching Frequency 100 | Turns Ratio4:1:0.86 | Saturation Current1500 mA | SizeEE20/10/6 | – | Inductance0.7 mH | – | – | Insulation Test Voltage4500 V (AC) | – | Length22.25 mm | Width14.6 mm | Height23.24 mm | MountTHT | –Check availability | |||
 | SPECWE-CMB Common Mode Power Line Choke, –, – | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CMB Common Mode Power Line Choke | – | – | – | – | – | – | – | – | – | – | SizeXS | Rated Current0.3 A | Inductance39 mH | DC Resistance3000 mΩ | Rated Voltage250 V (AC) | Insulation Test Voltage1500 V (AC) | MaterialMnZn | Length15.8 mm | Width7.8 mm | Height18 mm | MountTHT | –Check availability |
| Expected Availability | Opening inventory | Quantity |
|---|---|---|
| Current Availability | – | – |