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IC manufacturers ADI Power by Linear

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ADI Power by Linear 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.

Products

Order Code Data­sheet Downloads Product seriesVINVOut1
(V)
IOut1
(mA)
Vaux
(V)
fswitch
(kHz)
L
(µH)
NPRI : NSEC : NAUXISAT
(A)
VT
(V (AC))
L
(mm)
W
(mm)
H
(mm)
Mount Samples
750311558SPEC
5 files MID-FLYLT Flyback Transformers for Linear Technology 35 - 75 V (DC) 5 400 5 200 - 300 300 4:1:1 0.5 1500 9.78 9.5 10.54 SMT
Order Code Data­sheet
750311558SPEC
Samples
Order Code Data­sheet Downloads Product seriesVINVOut1
(V)
IOut1
(mA)
Vaux
(V)
fswitch
(kHz)
L
(µH)
NPRI : NSEC : NAUXISAT
(A)
VT
(V (AC))
L
(mm)
W
(mm)
H
(mm)
Mount Samples