LinkSwitch-4 Family Energy-Efcfi ient, Accurate Primary-Side Regulated CV/CC Switcher for Adapters and Chargers Product Highlights + Dramatically Simplifies CV/CC Converters Eliminates optocoupler and all secondary CV/CC control circuitry Eliminates all control loop compensation circuitry LinkSwitch-4 BD U1 LNK4xx2S ED Advanced Performance Features ~ VCC Dynamic base drive technology provides flexibility in choice of BJT CS FB transistor by dynamically optimizing BJT switching characteristics GND Extends RBSOA of BJT Dramatically reduces sensitivity to BJT gain Compensates for input line voltage variations PI-7462-122315 Figure 1. Typical Application (SOT-23-6) (S). Compensates for cable voltage drop Compensates for external component temperature variations + Very accurate IC parameter tolerances using proprietary trimming technology Frequency up to 65 kHz to reduce transformer size The minimum peak current is fixed to improve transient load response BD ED Enhanced Performance Features VCC ~ LinkSwitch-4 Easy start for starting into capacitive loads (LNK4114D, LNK4115D) U1 LNK40x3D Constant power for high current start-up (LNK4214D, LNK4215D) SBD CS 13003 drive improved efficiency with 13003 BJTs (LNK4302S, FB LNK4322S) GND Advanced Protection/Safety Features Single fault output overvoltage and short-circuit PI-7464-010815 Figure 2. Typical Application (SO-8) (D). Over-temperature protection Active clamp Output Power Table EcoSmart Energy Efficient 85 - 265 VAC Meets DoE 6 and CoC V5 2016 via an optimized quasi-resonant 3,4 Product 1 switching PWM/PFM control Adapter 5 Features 2 Open Frame No-load consumption of <30 mW at 230 VAC input LNK43x2S 13003 Drive 5 W Green Package LNK40x2S STD 6.5 W Halogen free and RoHS compliant package LNK40x3S STD 8 W Applications LNK4323S STD 8 W Chargers for cell/cordless phones, PDAs, MP3/portable audio LNK40x3D STD 10 W devices, adapters, networking, etc. LNK4323D STD 10 W Description LNK40x4D STD 15 W TM LNK4114D Easy Start 15 W The LinkSwitch -4 family of ICs dramatically simplifies low power CV/CC LNK4214D Easy Start + Constant Power 15 W charger design by eliminating an optocoupler and secondary control circuitry. The LinkSwitch-4 family adaptive BJT drive technology uses LNK4115D Easy Start 18 W combined base and emitter switching to boost switching performance LNK4215D Easy Start + Constant Power 18 W and deliver higher efficiency, wider Reverse Bias Safe Operating Area Table 1. Output Power Table. (RBSOA) margin and the flexibility to accommodate a wide range of low Notes: cost BJT. The device incorporates a multimode PWM/PFM controller 1. Minimum continuous power in a typical enclosed adapter measured at +50 C with quasi resonant switch to maximize the efficiency, meets low ambient, 85-265 VAC device T 100 C. J 2. Maximum practical continuous power in an open frame design with adequate no-load power and at same time maintain fast transient response heat sinking, measured at +50 C. greater than 4.3 V with a load change from 0% to 100%. 3. Package: D: SO-8 , S: SOT-23-6. 4. Cable compensation factor. x = 0 (no cable compensation), x = 1 (3% cable compensation) x = 2 (6% cable compensation). 5. Easy Start feature uses the BJT current to directly charge C , allowing VCC start-up into large output capacitors. 13003 drive feature has the gate drive optimized for maximum efficiency when using 13003 BJTs. Constant power feature provides 175% of rated current at start-up, allowing start-up into Figure 3. SOT-23-6 and SO-8 Packages. large output capacitors (see Figure 15). STD are standard products with all the advanced performance and protection/safety features. www.power.com May 2018 This Product is Covered by Patents and/or Pending Patent Applications.LinkSwitch-4 V DD(REG) V VOLTAGE SUPPLY DD (VCC) V REGULATOR DD I Reset FBHT(LO) V RESET CIRCUIT IN Signal I FBHT(START) UVP V V VCC(RUN) VCC(SLEEP) V ESTIMATOR HT CYCLE TIMING THERMAL FEEDBACK SHUTDOWN (FB) V CV VOLTAGE OUT BASE DRIVE CONTROL V (BD) OVP OVP PFM/PWM CABLE COMPENSATION EMITTER DRIVE (ED) CC CURRENT CURRENT CONTROL SENSE GROUND (CS) (GND) V CSTHR CS CS BLANKING OCP V CMAX PI-7460-033015 Figure 4. LNK40x2S, LNK40x3S, LNK4323S and LNK43x2S Functional Block Diagram. 2 Rev. F 05/18 www.power.com