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reference designDC1817B | Demoboard DC1817B

Analog Devices DC1817B | Demoboard DC1817B

Isolated No Opto-Coupler Flyback Controller with Active PFC

Overview

TopologyFlyback Converter
Input voltage90-265 V
Output 124 V / 2 A

Description

Demonstration circuit 1817B is an off-line isolated flyback converter featuring the LT®3798. The demo board provides a single constant-voltage output of 24V at 2A. It is optimized to operate over a wide AC input voltage range (90VAC to 265VAC, 47Hz to 63Hz). Output voltage accuracy stays within ±5% over the whole input voltage and load range. It provides a high power factor (>0.95) enabling the design to be used worldwide. It is also designed to comply with the IEC 61000-3-2 Class D harmonics standard and the EN55015B conducted EMI standard.The LT3798 controls an isolated flyback converter in boundary mode, suitable for applications with voltage or current regulation. Its novel sensing scheme delivers a well regulated output voltage or current to the secondary side without the use of an opto-coupler. The LT3798 is available in a low profile, thermally enhanced 16-lead MSOP package. The LT3798 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 1817B.

Features

  • Isolated PFC Flyback with Minimum Number of External Components
  • VIN and VOUT Limited Only by External Components
  • Active Power Factor Correction
  • Low Harmonic Distortion
  • No Opto-Coupler Required
  • Constant-Current and Constant-Voltage Regulation
  • Accurate Regulated Voltage and Current (±5% Typical)
  • Energy Star Compliant (<0.5W No Load Operation)
  • Thermally Enhanced 16-lead MSOP Package

Typical applications

  • Offline 5W to 100W+ Applications, High DC VIN Isolated Applications, Offline Bus Converter (12V, 24V or 48V Outputs）

More information

Parts approved by Analog Devices

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
VIN
VOut1(V)
IOut1(A)
Vaux(V)
RDC 1(Ω)
RDC 2(Ω)
RDC 3(Ω)
RDC 4(Ω)
fswitch(kHz)
L(µH)
NPRI : NSEC : NAUX
ISAT(A)
VT(V (AC))
L(mm)
W(mm)
H(mm)
Mount
Size
SamplesAvailability & Sample
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750811248
SPECWE-OLLT Offline Flyback Transformers, 85 - 265 V (AC), 24 V
Simu­lation
Availability
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Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-OLLT Offline Flyback Transformers
Input Voltage 85 - 265 V (AC)
Output Voltage 124 V
Output Current 12 A
Auxiliary Voltage24 V
DC Resistance 10.155 Ω
DC Resistance 20.125 Ω
DC Resistance 30.025 Ω
DC Resistance 40.185 Ω
Switching Frequency 60 - 400
Inductance300 µH
Turns Ratio2:2:1:1 
Saturation Current3.5 A
Insulation Test Voltage4500 V (AC)
Length31 mm
Width31 mm
Height25 mm
MountTHT 
SizeER28/14 
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