LinkSwitch-II

Dramatically simplifies low power CV/CC charger designs by eliminating an optocoupler and secondary control circuitry.
linkswitch-ii_typical_application_image_0.gif
Typical Application/Performance – Not a Simplified Circuit (a) and Output Characteristic Envelope (b).

Description

The LinkSwitch-II 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 tight output voltage and current regulation, compensating for transformer and internal parameter tolerances along with input voltage variations.

The device incorporates a 700 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

 LNK632DG

  • Dramatically simplifies CV converters
  • Enables Clampless designs when an external bias circuit is used

Advanced Performance Features

  • Compensates for transformer inductance tolerances
  • Compensates for input line voltage variations
  • Compensates for cable voltage drop (LNK61X series & LNK632)
  • Compensates for external component temperature variations
  • Very tight IC parameter tolerances using proprietary trimming technology
  • Frequency jittering greatly reduces EMI filter cost
  • Even tighter output tolerances achievable with external resistor selection/trimming

Advanced Protection/Safety Features

  • Auto-restart protection reduces power delivered by >95% for output short circuit and control loop faults (open and shorted components)
  • Hysteretic thermal shutdown – automatic recovery reduces power supply returns from the field
  • Meets HV 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
  • No-load consumption <200 mW at 230 VAC and down to below 30 mW with optional external bias
  • On/Off control provides constant efficiency down to very light loads – ideal for CEC and ENERGY STAR 2.0 regulations
  • No current sense resistors – maximizes efficiency

Green Package

  • Halogen free and RoHS compliant package

Applications

  • Chargers for cell/cordless phones, PDAs, MP3/portable audio devices, adapters
  • LED drivers, etc.

Output Power (Watts)
PRODUCT1

85-265 VAC

Adapter2 Open Frame3
LNK603PG/DG
LNK613PG/DG
2.5 3.3
LNK604PG/DG
LNK614PG/DG
3.5 4.1
LNK605PG/DG
LNK615PG/DG
4.5 5.1
LNK606PG/GG/DG
LNK616PG/GG/DG
5.5 6.1
LNK632DG 3.1 3.1

Notes:

  1. Packages: D: SO-8C, G: SMD-8C, P: DIP-8C.
  2. Minimum continuous power in a typical non-ventilated enclosed adapter measured at +50 °C ambient, device, TJ <100 °C.
  3. Maximum practical continuous power in an open frame design with adequate heatsinking, measured at 50 °C ambient.

Product Documents
Application Notean44.pdf
Package Informationpackageinfo.pdf
Data Sheetslinkswitch-ii_632DG_datasheet.pdf LNK632DGlinkswitch-ii_family_datasheet.pdf LNK6X3-LNK6X6

Reference Designs
RDKs include a working power supply, sample devices, unpopulated pcb, data sheet, comprehensive engineering report, PI Expert design software and other related documentation.
RDK-158 LinkSwitch-II Reference Design Kit

Design Examples - LED Drivers
DER-351 Low Cost, 3 W Output Isolated LED Driver for GU10
DER-261 3.6 W (12 V, 300 mA), High Efficiency (≥75%), Isolated LED Driver for GU10
DI-206 3.67 W (10.5 V, 350 mA) universal input, constant voltage/constant current (CV/CC) power supply for LED driver applications - flyback configuration
DI-185 4.2 W (12 V, 350 mA) universal input, constant voltage/constant current (CV/CC) power supply for LED driver applications - flyback configuration
DI-186 4.2 W (12 V, 350 mA) universal input, constant voltage/constant current (CV/CC) power supply for LED driver applications - tapped-inductor non-isolated buck configuration

Design Examples - Chargers and Adapters
DI-157 2.75 W universal input, constant voltage/constant current (CV/CC) charger
DI-158 5 W universal input, constant voltage/constant current (CV/CC) charger
DI-159 2.4 W universal input, constant voltage/constant current (CV/CC) Charger/Adapter with 10 kV Common-mode Surge Immunity