This product is not recommended for new designs. LNK500 LinkSwitch Family Energy Efficient, CV or CV/CC Switcher for Very Low Cost Chargers and Adapters LinkSwitch Product Highlights DS Cost Effective Linear/RCC Replacement C Lowest cost and component count, constant voltage (CV) or 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 (a) compensation functions minimizes external components Example Characteristic Fully integrated auto-restart for short circuit and open loop V V O O Min Typ 5% fault protection saves external component costs 42 kHz operation simplifies EMI filter design 10% Much Higher Performance Over Linear/RCC Universal input range allows worldwide operation Up to 70% reduction in power dissipation reduces enclosure I I O O size significantly 25%* 25%* (b) CV/CC output characteristic without secondary feedback For Circuit With Optional System level thermal and current limit protection Shown Above Secondary Feedback** Meets all single point failure requirements with only one *Estimated tolerance achievable in high volume production additional clamp capacitor including transformer and other component tolerances. Controlled current in CC region provides inherent soft-start **See Optional Secondary Feedback section. Optional opto feedback improves output voltage accuracy PI-3415-112202 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 Star, and EU requirements 1 Output Power Table No current sense resistors maximizes efficiency No-Load 230 VAC 15% 85-265 VAC 4 Applications Product Input 2 2 2 2 Linear transformer replacement in all 3 W applications Min Typ Min Typ Power Chargers for cell phones, cordless phones, PDAs, digital 3.2 W 4 W 2.4 W 3 W <300 mW LNK500 cameras, MP3/portable audio devices, shavers, etc. 3 P or G 4.3 W 5.5 W 2.9 W 3.5 W <500 mW Home appliances, white goods and consumer electronics Constant output current LED lighting applications Table 1. Notes: 1. Output power for designs in an enclosed TV standby and other auxiliary supplies adapter measured at 50 C ambient. 2. See Figure 1 (b) for Min (CV only designs) and Typ (CV/CC charger designs) power Description points identified on output characteristic. 3. Uses higher reflected voltage transformer designs for increased power capability see LinkSwitch is specifically designed to replace low power Key Application Considerations section. 4. For lead-free package linear transformer/RCC chargers and adapters at equal or options, see Part Ordering Information. lower system cost with much higher performance and energy efficiency. LNK500 is a lower cost version of the LNK501 with a wider tolerance output CC characteristic. LinkSwitch introduces consumption, a LinkSwitch solution can save the end user a revolutionary patented topology for the design of low power enough energy over a linear design to completely pay for the full power supply cost in less than one year. LinkSwitch switching power supplies that rivals the simplicity and low integrates a 700 V power MOSFET, PWM control, high voltage cost of linear adapters, and enables a much smaller, lighter, start-up, current limit, and thermal shutdown circuitry, onto a and attractive package when compared with the traditional brick. With efficiency of up to 75% and <300 mW no-load monolithic IC. September 2016LNK500 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 5.7 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-3416-111802 Figure 2. Block Diagram. Pin Functional Description LNK500 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-3417-111802 SOURCE (S) Pin: Figure 3. Pin Configuration. Output MOSFET source connection for high voltage power return. Primary side control circuit common and reference point. 2 Rev. E 09/16 www.power.com + - + -