Microchip

HV9805

230VAC Off-line LED Driver with Dimming and Short-Circuit Load Protection using the HV9805 Controller

Topologie: Boost
Eingangsspannung (min.): 190.00 V
Eingangsspannung (max.): 265.00 V
Ausgang 1: 435.00 V / 0.060 A
Ausgang 2: 435.00 V / 0.090 A
Ausgang 3: 435.00 V / 0.030 A

Erstveröffentlichung am 03.02.2016, Version AN2080 vom

Beschreibung

230VAC Off-line LED Driver with Dimming and Short-Circuit Load Protectionusing the HV9805 ControllerAN2080The HV9805 driver integrated circuit (IC) is targeted at general LED lighting products, such as LED lamps and LED lighting fixtures with a maximum power rating of about 25W at 120VAC and 50W at 230VAC. A two-stage topology provides true constant current drive for the LED load while drawing mains power with high power factor. The first stage, a boundary conduction mode boost converter, transfers power from the AC line to a second stage linear current regulator with high power factor and high efficiency. The linear current regulator, arranged for operation with low overhead voltage, transfers power from the first stage to the LED load with true constant current (no ripple) and protectsthe LED load from the overvoltage that may pass from mains to the output of the first stage. The IC is particularly geared to drive a high voltage LED load. An LED load arranged as a high-voltage load is capable of offering cost advantages in terms of heat management and optics. The boost converter employs a cascode switch for high-speed switching and convenient generation of the VDD supply. The control device of the cascode switch is an integral part of the HV9805 and is rated at 700 mA peak. Current for powering the VDD supply is derived by means of an internal connection to the cascode switch.

Merkmale

  • 1st Stage with:
  • Boundary Conduction Mode (BCM) boostwith power factor correction
  • High power factor (0.98 typical)
  • High efficiency (90% typical)
  • Simple VDD supply: no auxiliary windingrequired
  • Boost converter cascode switch: internalswitch rated at 700 mA peak
  • Supports up to 25W at 120VAC
  • Supports up to 50W at 230VAC• 2nd Stage:
  • Linear post-regulator with low overhead voltage
  • Zero LED current and brightness ripple
  • Provides true DC light and protects load fromline voltage transients
  • Output load open circuit protection
  • High efficiency
  • ±4% reference over temperature

Artikel

  Artikel Nr. SPEC Produktserie IR 1
(A)
L1
(mH)
RDC1 max.
(Ω)
VR
(V (AC))
VT
(V (AC))
RDC max.
(mΩ)
RDC typ.
(mΩ)
L
(µH)
IR
(A)
ISAT
(A)
fres
(MHz)
Muster
7446631007 PDF WE-LF SMD Stromkompensierte Netzdrossel in SMD 1.4 6.8 0.3 250 1500
7687709222 PDF WE-PD HV SMT Speicherdrossel (High Voltage) 3700 3100 2200 0.43 0.65 0.8