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ReferenzdesignLT3799

Analog Devices LT3799

Offline Isolated Flyback LED Controller with Active PFC

Details

TopologieSperrwandler
Eingangsspannung90-150 V
Schaltfrequenz25-300 kHz
Ausgang 110 V / 0.4 A
IC-RevisionA

Beschreibung

The LT3799 is an isolated flyback controller with power factor correction specifically designed for driving LEDs. The controller operates using critical conduction mode allowing the use of a small transformer. Using a novel current sensing scheme, the controller is able to deliver a well regulated current to the secondary side without using an opto-coupler. A strong gate driver is included to drive an external high voltage MOSFET. Utilizing an onboard multiplier, the LT3799 typically achieves power factors of 0.97. The FAULT pin provides notification of open and short LED conditions.

The LT3799 uses a micropower hysteretic start-up to efficiently operate at offline input voltages, with a third winding to provide power to the part. An internal LDO provides a well regulated supply for the part’s internal circuitry and gate driver.

Eigenschaften

  • Isolated PFC LED Driver with Minimum Number of External Components
  • TRIAC Dimmable
  • VIN and VOUT Limited Only by External Components
  • Active Power Factor Correction (Typical PFC > 0.97)
  • Low Harmonic Content
  • No Opto-Coupler Required
  • Accurate Regulated LED Current (±5% Typical)
  • Open LED and Shorted LED Protection
  • Thermally Enhanced 16-lead MSOP Package
  • Isolated PFC LED Driver with Minimum Number of External Components
  • TRIAC Dimmable
  • VIN and VOUT Limited Only by External Components
  • Active Power Factor Correction (Typical PFC > 0.97)
  • Low Harmonic Content
  • No Opto-Coupler Required
  • Accurate Regulated LED Current (±5% Typical)
  • Open LED and Shorted LED Protection
  • Thermally Enhanced 16-lead MSOP Package

Typische Anwendungen

  • Offline 4W to 100W+ LED Applications
  • High DC VIN LED Applications

Weiterführende Informationen

Artikeldaten

Artikel Nr.
Daten­blatt
Simu­lation
Downloads
Status
Produktserie
Vin
VOut1(V)
IOut1(mA)
Vaux(V)
RDC 1(Ω)
RDC 2(Ω)
RDC 3(Ω)
fswitch(kHz)
L(mH)
NPRI : NSEC : NAUX
ISAT(mA)
VT(V (AC))
L(mm)
B(mm)
H(mm)
Montageart
Bauform
MusterVerfügbarkeit & Muster
7508110210
SPECWE-OLLT Offline Flyback Transformers, 85 - 141 V (AC), 11 V
Simu­lation
Verfügbarkeit
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Status Aktivi| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre.
ProduktserieWE-OLLT Offline Flyback Transformers
Input Voltage 85 - 141 V (AC)
Ausgangsspannung 111 V
Ausgangsstrom 1350 mA
Hilfsspannung15 V
Gleichstromwiderstand 15.1 Ω
Gleichstromwiderstand 20.092 Ω
Gleichstromwiderstand 31.35 Ω
Switching Frequency 100
Induktivität2 mH
Übersetzungsverhältnis6.67:1:1.67 
Sättigungsstrom270 mA
Prüfspannung4500 V (AC)
Länge15 mm
Breite15.75 mm
Höhe18.5 mm
MontageartTHT 
BauformEE13/6/6 
–Verfügbarkeit prüfen