LNK302/304-306 LinkSwitch-TN Family Lowest Component Count, Energy-Efficient Off-Line Switcher IC Product Highlights Cost Effective Linear/Cap Dropper Replacement FB BP Lowest cost and component count buck converter solution Fully integrated auto-restart for short-circuit and open loop D S + Wide Range LinkSwitch-TN fault protection saves external component costs DC High-Voltage Output LNK302 uses a simplified controller without auto-restart for DC Input very low system cost 66 kHz operation with accurate current limit allows low cost PI-3492-041509 off-the-shelf 1 mH inductor for up to 120 mA output current Figure 1. Typical Buck Converter Application (See Application Examples Section Tight tolerances and negligible temperature variation for Other Circuit Configurations). High breakdown voltage of 700 V provides excellent input surge withstand Frequency jittering dramatically reduces EMI (~10 dB) Minimizes EMI filter cost High thermal shutdown temperature (+135 C minimum) Much Higher Performance Over Discrete Buck and 1 Output Current Table Passive Solutions 230 VAC 15% 85-265 VAC Supports buck, buck-boost and flyback topologies 4 Product 2 3 2 3 System level thermal overload, output short-circuit and open MDCM CCM MDCM CCM control loop protection LNK302P/G/D 63 mA 80 mA 63 mA 80 mA Excellent line and load regulation even with typical congfi uration LNK304P/G/D 120 mA 170 mA 120 mA 170 mA High bandwidth provides fast turn-on with no overshoot LNK305P/G/D 175 mA 280 mA 175 mA 280 mA Current limit operation rejects line ripple Universal input voltage range (85 VAC to 265 VAC) LNK306P/G/D 225 mA 360 mA 225 mA 360 mA Built-in current limit and hysteretic thermal protection Table 1. Output Current Table. Higher efficiency than passive solutions Notes: Higher power factor than capacitor-fed solutions 1. Typical output current in a non-isolated buck converter. Output power capability depends on respective output voltage. See Key Applications Considerations Entirely manufacturable in SMD Section for complete description of assumptions, including fully discontinuous conduction mode (DCM) operation. EcoSmart Extremely Energy Efficient 2. Mostly discontinuous conduction mode. Consumes typically only 50/80 mW in self-powered buck 3. Continuous conduction mode. 4. Packages: P: DIP-8B, G: SMD-8B, D: SO-8C. topology at 115/230 VAC input with no-load (opto feedback) Consumes typically only 7/12 mW in flyback topology with external bias at 115/230 VAC input with no-load Meets California Energy Commission (CEC), Energy Star, and EU requirements Applications Appliances and timers and thermal shutdown circuitry onto a monolithic IC. The start-up LED drivers and industrial controls and operating power are derived directly from the voltage on the DRAIN pin, eliminating the need for a bias supply and associated Description circuitry in buck or flyback converters. The fully integrated auto-restart circuit in the LNK304-306 safely limits output power LinkSwitch-TN is specifically designed to replace all linear and during fault conditions such as short-circuit or open loop, capacitor-fed (cap dropper) non-isolated power supplies in the reducing component count and system-level load protection under 360 mA output current range at equal system cost while cost. A local supply provided by the IC allows use of a non- offering much higher performance and energy efficiency. safety graded optocoupler acting as a level shifter to further LinkSwitch-TN devices integrate a 700 V power MOSFET, enhance line and load regulation performance in buck and oscillator, simple On/Off control scheme, a high-voltage switched buck-boost converters, if required. current source, frequency jittering, cycle-by-cycle current limit www.powerint.com June 2013 This Product is Covered by Patents and/or Pending Patent Applications. +LNK302/304-306 BYPASS DRAIN (BP) (D) REGULATOR 5.8 V BYPASS PIN UNDERVOLTAGE + 5.8 V - 4.85 V CURRENT LIMIT COMPARATOR 6.3 V V I LIMIT JITTER CLOCK DC MAX THERMAL FEEDBACK SHUTDOWN (FB) OSCILLATOR 1.65 V -V T S Q R Q LEADING EDGE BLANKING SOURCE (S) PI-3904-032213 Figure 2a. Functional Block Diagram (LNK302). BYPASS DRAIN (BP) (D) REGULATOR 5.8 V FAULT PRESENT AUTO- RESTART BYPASS PIN COUNTER UNDERVOLTAGE 6.3 V + CLOCK 5.8 V CURRENT LIMIT - RESET 4.85 V COMPARATOR V I LIMIT JITTER CLOCK DC MAX THERMAL FEEDBACK SHUTDOWN (FB) OSCILLATOR 1.65 V -V T S Q R Q LEADING EDGE BLANKING SOURCE (S) PI-2367-032213 Figure 2b. Functional Block Diagram (LNK304-306). 2 Rev. J 06/13 www.powerint.com - + - +