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reference designLT3511EMS | Demoboard DC1517A

Analog Devices LT3511EMS | Demoboard DC1517A

LT3511EMS Demo Board | 36V to 75VIN, VOUT= 5V @ 300mA

Overview

TopologyFlyback Converter
Input voltage36-75 V
Output 15 V / 0.3 A
IC revision2

Description

Demonstration circuit 1517A is a monolithic high voltage isolated fl yback converter featuring the LT3511. This demo circuit is designed for a 5V isolated output from an input voltage range of 36V to 75V. The maximum output current is up to 300mA. The circuit doesn’t require an opto-isolator,due to the output voltage being sensed directly from the primary side transformer winding. A third winding off the transistor is used to bias the LT3511 for highest efficiency.

The fl yback converter requires a minimum load to maintain good regulation. A Zener diode is placed between VOUT + and VOUT – to clamp output voltage to ~7.5V if the minimum load requirement is not met. Depending on the input voltage and the output regulation requirement, a15mA to 20mA minimum load is usually sufficient.

This demo circuit uses a diode-Zener clamp to limit the peak spike voltage due to transformer leakage inductance. A diode-Zener clamp is more effi cient than a RCD clamp.

The LT3511 operates in boundary mode and also provides output voltage temperature compensation.

The LT3511 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.

More information

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Data­sheet
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Product series
VIN
VOut1(V)
IOut1(mA)
Vaux(V)
L(µH)
n
ISAT(A)
LS(µH)
VT(V (AC))
Size
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750311558
SPECWE-FLYLT Flyback Transformers for Linear Technology, 35 - 75 V (DC), 5 V
Simu­lation
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-FLYLT Flyback Transformers for Linear Technology
Input Voltage 35 - 75 V (DC)
Output Voltage 15 V
Output Current 1400 mA
Auxiliary Voltage5 V
Inductance300 µH
Turns Ratio4:1:1 
Saturation Current0.5 A
Leakage Inductance3 µH
Insulation Test Voltage1500 V (AC)
SizeEP7 
IC ReferenceLT8300 
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