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


Product Details

The LinkSwitch-3 family of ICs dramatically simplifies low power CV/CC charger designs by eliminating an optocoupler and secondary control circuitry. The device introduces a revolutionary control technique to provide very accurate output voltage and current regulation, compensating for transformer and internal parameter tolerances along with input voltage variations.

The device incorporates a 725 V power MOSFET, a novel ON/OFF control state machine, a high-voltage switched current source for self biasing, frequency jittering, cycle-by-cycle current limit and hysteretic thermal shutdown circuitry onto a monolithic IC.

Product Highlights

Dramatically Simplifies CV/CC Converters

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

Advanced Performance Features

  • Compensates for transformer inductance tolerances, input line voltage variations, and cable voltage drop
  • Very tight IC parameter tolerances using proprietary trimming technology
  • Frequency jittering greatly reduces EMI filter cost
  • Programmable switching frequency up to 85 kHz to reduce transformer size
  • Minimum operation frequency fixed to improve transient load response

Advanced Protection/Safety Features

  • Hysteretic thermal shutdown – automatic recovery reduces power supply returns from the field
  • Meets high-voltage creepage requirements between DRAIN and all other pins both on the PCB and at the package

EcoSmart– Energy Efficient

  • Easily meets all global energy efficiency regulations with no added components
  • No-load consumption at 230 VAC input with bias winding <30 mW

Green Package

  • Halogen free and RoHS compliant package


Output Power (Max) - Enclosed, Univ 8.50 W
Output Power (Max) - Open Frame, Univ 9.00 W
Switching Frequency (min) 60.00 kHz
Switching Frequency (max) 85 kHz
Breakdown Voltage 725 V
Voltage - Input (Min) 90 V
Voltage - Input (Max) 264 V
Cable Drop Compensation 1.06
IC Package eSOP-12B
Internal Switch Yes
Mounting Type Surface Mount
Over-Temperature Response Hysteretic
Temperature - Operating (Min) -40 °C
Temperature - Operating (Max) 150 °C
Control Scheme Primary-side
Control Features
Cable Drop Compensation
Selectable Current Limit
Frequency Jittering
Programmable Switching Frequency
Auto-Restart/Latching Fault Response
On/Off Control
Protection Features
Output Open Loop
Output Short Circuit
Output Profile CV/CC
Topology Flyback
Product Sub-Type PMIC