Offline Half-Bridge / LLC WLED Controller Featuring Low BOM Cost and Transformer Audible Noise Reduction



The MP4652 is a high-performance, off-line LED driver designed to power LEDs for high-power isolated applications, such as LCD TV backlighting. It is available in a 16-pin SOIC package. The MP4652 can operate at a fixed operating frequency or a variable frequency controlled externally. It outputs two 180-degree phase-shifted driver signals for various external power stages, like LLC, half bridge and flyback. Its enhanced 9V gate driver can sufficiently drive the external MOSFETs and directly drives the external gate drive transformer. The MP4652 implements fast and continuous PWM dimming for LEDs. It outputs a driver signal to directly dim the LED current through a dimming MOSFET and achieves fast PWM dimming. It provides continuous gate driver signals to the power stage to the whole PWM dimming cycle that eliminates the audible noise: the MP4652 can achieve 1000:1 PWM dimming ratio without any audible noise issue. The PWM dimming is controlled by either a DC input voltage or a direct PWM signal. The DC input PWM dimming frequency can be synchronized by an external signal. The built-in fault management features include open LED protection, short LED protection, protection against shorts along any point of the LED string to ground, and over temperature protection. The protection interface is flexible and is easy to use. At fault protection, system can be set up with auto-recovery or latch up.


  • LLC, Half Bridge or Flyback Controller
  • Fast and Continuous PWM Dimming with Audible Noise Elimination
  • 1000:1 PWM Dimming Ratio
  • Input Voltage Range from 9V to 30V
  • 9V Enhanced Gate Driver
  • Fixed or Externally Programmable Operating Frequency
  • DC or PWM Input Dimming Control
  • DC Input PWM Dimming Frequency Synchronization
  • Smart Fault Protection Interface
  • Open and Short LED String Protection
  • Protection Against Shorts Along the LED String to Ground
  • Built-In Fault Management
  • System Auto Recovery or Latch Up at Fault Protection
  • Available in SOIC 16 Package
  • Pin-to-Pin with MP4651


  • Ishutdown (µA)1
  • 最小输入电压9
  • Vin (max) (V)30
  • Channels1
  • fsw (min) (kHz)20
  • fsw (max) (kHz)150
  • Vfb (V)0.6
  • GradeCatalog
  • PackageSOIC-16
  • Power MOSFETExternal
  • TopologyLLC
  • Dimming (Output)P-Dim
  • Iq (mA)1.5
  • Typical LCD Screen SizesLarge (30"-45"), Large+ (>45")
  • Other FeaturesOutput/Input Disconnect