LNK64x4-64x8 LinkSwitch-3 Family Energy-Efficient, Accurate Primary-Side Regulation CV/CC Switcher for Adapters and Chargers Product Highlights DC Dramatically Simplifies CV/CC Converters Output Eliminates optocoupler and all secondary CV/CC control circuitry Eliminates all control loop compensation circuitry Advanced Performance Features Wide Range Compensates for transformer inductance tolerances High-Voltage Compensates for input line voltage variations DC Input D Compensates for cable voltage drop FB Compensates for external component temperature variations LinkSwitch-3 BP Very accurate IC parameter tolerances using test trimming technology S Frequency jittering greatly reduces EMI filter cost Programmable switching frequency up to 85 kHz to reduce trans- former size PI-6907-020515 Minimum operation frequency fixed to improve transient load response Figure 1. Typical Application Not a Simplified Circuit. Advanced Protection/Safety Features Auto-restart protection reduces power delivered by >90% for output 1,2,3,4 short-circuit and control loop faults (open and shorted components) Output Power Table Hysteretic thermal shutdown automatic recovery reduces power 90-264 VAC supply returns from the field 5 Meets high-voltage creepage requirements between DRAIN and all Product D (SO-8C) Package other pins both on the PCB and at the package Adapter Open Frame EcoSmart Energy Efficient LNK6404D / LNK6424D 3.5 W 4.1 W Easily meets all global energy efficiency regulations with no added LNK6405D / LNK6415D / components 4.5 W 5.1 W LNK6425D No-load consumption at 230 VAC input with bias winding <10 mW for LNK6406D / LNK6416D / LNK64x4-LNK64x6 and <30 mW for LNK64x7-LNK64x8 LNK6426D / LNK6436D / 5.5 W 6.1 W ON/OFF control provides constant efficiency down to very light loads LNK6446D ideal for CEC regulations LNK6407D / LNK6417D / No current sense resistors maximizes efficiency 7.5 W 7.5 W LNK6427D Green Package E (eSIP-7C) and Halogen free and RoHS compliant package 5 K (eSOP-12B) Packages Product Applications Adapter Open Frame Chargers for cell/cordless phones, PDAs, MP3/portable audio devices, adapters, etc. LNK6407K / LNK6417K / 8.5 W 9 W LNK6427K Description LNK6408K / LNK6418K / 10 W 10 W The LinkSwitch-3 family of ICs dramatically simplifies low power CV/ LNK6428K / LNK6448K CC charger designs by eliminating an optocoupler and secondary LNK6408E / LNK6418E / 10 W 10 W control circuitry. The device introduces a revolutionary control LNK6428E / LNK6448E technique to provide very accurate output voltage and current Table 1. Output Power Table. regulation, compen-sating for transformer and internal parameter Notes: tolerances along with input voltage variations. 1. Assumes minimum input DC voltage >90 VDC, K 1 (Recommend K 1.15 P P for accurate CC regulation), >78%, D <55%. The device incorporates a 725 V power MOSFET, a novel ON/OFF control MAX 2. Output power capability is reduced if a lower input voltage is used. state machine, a high-voltage switched current source for self biasing, 3. Minimum continuous power with adequate heat sink measured at 50 C frequency jittering, cycle-by-cycle current limit and hysteretic thermal ambient with device junction below 110 C. shutdown circuitry onto a monolithic IC. 4. Assumes bias winding is used to supply BYPASS pin. 5. Package: D: SO-8C, E: eSIP-7C, K: eSOP-12B. www.power.com March 2016 This Product is Covered by Patents and/or Pending Patent Applications. +D S NC NC BP FB LNK64x4-64x8 DRAIN (D) REGULATOR BYPASS 6 V (BP) + 6 V FB - 5 V + OUT Reset D Q STATE FEEDBACK V TH - MACHINE (FB) V ILIMIT t SAMPLE-OUT I Drive LIM V DC ILIMIT CABLE DROP MAX COMPENSATION FAULT 6.5 V FB AUTO-RESTART OPEN-LOOP THERMAL INDUCTANCE SHUTDOWN CORRECTION DC MAX t SAMPLE-INPUT t SAMPLE-OUT SAMPLE t DELAY SAMPLE-INPUT OSCILLATOR SOURCE (S) I LIM SOURCE V ILIMIT CONSTANT (S) CURRENT Current Limit LEADING Comparator EDGE BLANKING PI-6660-020515 Figure 2 Functional Block Diagram. Pin Functional Description E Package DRAIN (D) Pin: (eSIP-7C) This pin is the power MOSFET drain connection. It provides Exposed Pad internal operating current for both start-up and steady-state (On Back Side) Internally operation. Connected to SOURCE Pin BYPASS (BP) Pin: D Package (SO-8C) This pin is the connection point for an external 1 mF bypass capacitor for the internally generated 6 V supply. FB 1 8 S FEEDBACK (FB) Pin: BP 2 7 S 1 2 3 4 5 7 During normal operation, switching of the power MOSFET is 6 S controlled by this pin. This pin senses the AC voltage on the bias winding. This control input regulates both the output D 4 5 S voltage in CV mode and output current in CC mode based on the flyback voltage of the bias winding. The internal induc - Exposed Pad (On Bottom) tance correction circuit uses the forward voltage on the bias K Package Internally Connected to winding to sense the bulk capacitor voltage. (eSOP-12B) SOURCE Pin FB 1 12 S SOURCE (S) Pin: This pin is internally connected to the output MOSFET source BP 2 11 S for high-voltage power and control circuit common returns. NC 3 10 S NC 4 9 S 8 S D 6 7 S PI-6906-020515 Figure 3. Pin Configuration. 2 Rev. C 03/16 www.power.com - +