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Texas Instruments UCC28720

Constant-Voltage, Constant-Current Controller With Primary-Side Regulation

Details

TopologieSperrwandler
Eingangsspannung90-256 V
Schaltfrequenz74-87 kHz
Ausgang 15 V / 1 A
IC-RevisionB

Beschreibung

The UCC28720 flyback power supply controller provides isolated-output Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current.

An internal 700-V start-up switch, dynamically-controlled operating states and a tailored modulation profile support ultra-low standby power without sacrificing start-up time or output transient response.

Control algorithms in the UCC28720 allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a bipolar transistor power switch. Discontinuous conduction mode (DCM) with valley switching reduces switching losses. Modulation of switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.

The controller has a maximum switching frequency of 80 kHz and always maintains control of the peak-primary current in the transformer. Protection features help keep primary and secondary component stresses in check. The UCC28720 allows compensation for voltage drop in the cable to be programmed with an external resistor

Eigenschaften

  • < 10-mW No-Load Power
  • Primary-Side Regulation (PSR) Eliminates Opto-Coupler
  • ±5% Voltage and Current Regulation Across Line and Load
  • 700-V Start-Up Switch
  • 80-kHz Maximum Switching Frequency Enables High-Power Density Charger Designs
  • Quasi-Resonant Valley-Switching Operation for Highest Overall Efficiency
  • Wide VDD Range Allows Small Bias Capacitor
  • Dynamic BJT Drive
  • Overvoltage, Low-Line, and Overcurrent Protection Functions
  • Programmable Cable Compensation
  • SOIC-7 Package

Remarks

  • L1=470uH page no-4

Typische Anwendungen

  • White Goods
  • Smart phones
  • USB-Compliant Adapters and Chargers forConsumer Electronics
  • Cameras
  • Standby Supply for TV and Desktop
  • Tablet computers

Weiterführende Informationen

Artikeldaten

Artikel Nr. Daten­blatt Simu­lation Downloads Status ProduktserieVinVOut1
(V)
IOut1
(A)
Vaux
(V)
fswitch
(kHz)
L
(µH)
NPRI : NSEC : NAUXISAT
(mA)
VT
(V (AC))
L
(mm)
W
(mm)
H
(mm)
MontageartBauform Muster
7508110151
5 Dateien Aktiv i| Produktion ist aktiv. Erwartete Lebenszeit: >10 Jahre.MID-OLTI Offline Flyback Transformers for Texas Instruments 85 - 265 V (AC) 5 1 15 70 1500 15.42:1:3.14 425 4000 13.97 13.97 12.7 THT EP13
Artikel Nr. Daten­blatt Simu­lation
7508110151
Muster
Artikel Nr. Daten­blatt Simu­lation Downloads Status ProduktserieVinVOut1
(V)
IOut1
(A)
Vaux
(V)
fswitch
(kHz)
L
(µH)
NPRI : NSEC : NAUXISAT
(mA)
VT
(V (AC))
L
(mm)
W
(mm)
H
(mm)
MontageartBauform Muster