Linear Technology part of Analog Devices

LT3511EMS
Demoboard DC1517A

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

Topologie: Flyback
Eingangsspannung (min.): 36.00 V
Eingangsspannung (max.): 75.00 V
Ausgang 1: 5.00 V / 0.300 A

Erstveröffentlichung am 09.02.2011, Version 2

Beschreibung

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.

Artikel

  Artikel Nr. SPEC Produktserie Vin VOut1
(V)
IOut1
(mA)
Vaux
(V)
fswitch
(kHz)
L1
(µH)
NPRI : NSEC : NAUX VT
(V (AC))
L
(mm)
W
(mm)
H
(mm)
Montageart Muster
750311558 PDF MID-FLYLT Flyback Transformers for Linear Technology 35 - 75 V (DC) 5 400 5 200 - 300 300 4:1:1 1875 9.78 9.14 10.54 SMT