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Energy-Efficient, Accurate Primary-Side Regulated CV/CC Switcher for Adapters and Chargers


Product Details

The LinkSwitch™-4 Family of offline power conversion ICs targets chargers and adapters required to meet stringent new efficiency rules from the US Department of Energy (DoE) and European Code of Conduct (CoC). The new DoE rules, known as DoE-6, require efficiency compliance measurements to be taken at the end of the charger USB cable; LinkSwitch-4 exceeds this requirement while using a low-complexity Schottky diode secondary, even for high-current 1.5 A and 2 A smartphone chargers.

The LinkSwitch-4 Family features an advanced adaptive base-emitter switched drive scheme for bipolar junction transistor (BJT) switches to substantially improve power conversion efficiency and eliminate reliability concerns due to secondary breakdown. The device incorporates a multimode PWM/PFM controller with quasi-resonant switch to maximize the efficiency and meet <30 mW no-load while still maintaining fast transient response.

Product Highlights

Advanced Performance Features

  • Adaptive base-emitter switched drive technology provides flexibility in choice of BJT transistor by optimizing BJT switching characteristics
  • Extends reverse bias safe operating area (RBSOA) of BJT
  • Dramatically reduces sensitivity to BJT gain
  • Meets DoE 6 and CoC V5 2016 via an optimized quasi-resonant switching PWM/PFM control
  • No-load consumption of <30 mW at 230 VAC input
  • Compensates for transformer inductance tolerances, input line voltage variations, cable voltage drop, and external component temperature variations
  • Accurate IC parameter tolerances using proprietary trimming technology
  • Fixed minimum peak current to improve transient load response

Enhanced Performance Features

  • Easy start for starting into capacitive loads
  • Constant power for high current start-up
  • 13003 drive improved efficiency with 13003 BJT's

Simplifies CV/CC Converters

  • Eliminates optocoupler and secondary CV/CC control circuitry
  • Eliminates control loop compensation circuitry

Advanced Protection/Safety Features

  • Single fault output overvoltage and short-circuit

Green Package

  • Halogen Free and RoHS Compliant package


Output Power (Max) - Open Frame, 230V 8.00 W
Cable Drop Compensation 0.03
IC Package SOT-23-6
Mounting Type Surface Mount
Temperature - Operating (Min) -25 °C
Temperature - Operating (Max) 125 °C