This product is not recommended for new designs. LNK501 LinkSwitch Family Energy Efficient, CV/CC Switcher for Very Low Cost Chargers and Adapters Product Highlights LinkSwitch DS Cost Effective Linear/RCC Replacement C Lowest cost and component count, constant voltage, constant current (CV/CC) solution Wide Range DC Extremely simple circuit configuration HV DC Input Output (V ) Up to 75% lighter power supply reduces shipping cost O Primary based CV/CC solution eliminates 10 to 20 secondary components for low system cost Combined primary clamp, feedback, IC supply, and loop compensation functions minimizes external components (a) Fully integrated auto-restart for short circuit and open loop V V O O fault protection saves external component costs 5% 42 kHz operation simplifies EMI filter design 10% 3 W output with EE13 core for low cost and small size Much Higher Performance Over Linear/RCC Universal input range allows worldwide operation I I Up to 70% reduction in power dissipation reduces O O 20%* 20%* (b) enclosure size significantly For Circuit With Optional CV/CC output characteristic without secondary feedback Shown Above Secondary Feedback** System level thermal and current limit protection *Estimated tolerance achievable in high volume production Meets all single point failure requirements with only one including transformer and other component tolerances. additional clamp capacitor **See Optional Secondary Feedback section. Controlled current in CC region provides inherent soft-start PI-2776-022603 Optional opto feedback improves output voltage accuracy Figure 1. Typical Application Not a Simplified Circuit (a) and EcoSmart Extremely Energy Efficient Output Characteristic Tolerance Envelopes (b). Consumes <300 mW at 265 VAC input with no load Meets California Energy Commission (CEC), Energy 1 Output Power Table Star, and EU requirements No-Load No current sense resistors maximizes efficiency 230 VAC 85-265 3 Product Input 15% VAC Applications Power Linear transformer replacement in all 3 W applications 4 W 3 W <300 mW Chargers for cell phones, cordless phones, PDAs, digital LNK501P or G 2 5.5 W 3.5 W <500 mW cameras, MP3/portable audio devices, shavers, etc. Home appliances, white goods and consumer electronics Table 1. Notes: 1. Typical output power for designs in an enclosed Constant output current LED lighting applications adapter measured at 50 C ambient. 2. Uses higher reflected TV standby and other auxiliary supplies voltage transformer designs for increased power capability See Key Application Considerations section. 3. For lead-free package options, see Part Ordering Information. Description LinkSwitch is specifically designed to replace all linear transformer/RCC chargers and adapters in the 3 W universal efficiency of up to 75% at 3 W output and < 300 mW no-load range at equal or lower system cost with much higher consumption, a LinkSwitch solution can save the end user performance and energy efficiency. LinkSwitch introduces a enough energy over a linear design to completely pay for revolutionary topology for the design of low power switching the power supply cost in less than one year. LinkSwitch power supplies that rivals the simplicity and low cost of linear integrates a 700 V power MOSFET, PWM control, high voltage adapters, and enables a much smaller, lighter, and attractive start-up, current limit, and thermal shutdown circuitry, onto a package when compared with the traditional brick. With monolithic IC. September 2016LNK501 DRAIN 0 CONTROL V C INTERNAL SUPPLY 1 Z C SHUTDOWN/ CURRENT AUTO-RESTART SHUNT REGULATOR/ LIMIT ERROR AMPLIFIER + ADJUST 8 5.6 V - 4.7 V CURRENT LIMIT 5.6 V COMPARATOR I HYSTERETIC FB THERMAL SHUTDOWN OSCILLATOR D MAX CLOCK S Q SAW - R + PWM COMPARATOR I DCS LEADING EDGE EDGE LOW BLANKING R FREQUENCY E OPERATION SOURCE PI-2777-032503 Figure 2. Block Diagram. Pin Functional Description LNK501 DRAIN (D) Pin: S C 1 8 Power MOSFET drain connection. Provides internal operating S 2 7 S current for start-up. Internal current limit sense point for drain current. S 3 CONTROL (C) Pin: S 4 5 D Error amplifier and feedback current input pin for duty cycle and current limit control. Internal shunt regulator connection to provide internal bias current during normal operation. It is also P Package (DIP-8B) used as the connection point for the supply bypass and auto- G Package (SMD-8B) restart/compensation capacitor. PI-2711-073107 Figure 3. Pin Configuration. SOURCE (S) Pin: Output MOSFET source connection for high voltage power return. Primary side control circuit common and reference point. 2 Rev. J 09/16 www.power.com + - + -