LNK574DG-TL Power Integrations

LNK574/576 LinkZero-LP Zero No-Load or Zero Standby Consumption with up to 1 mW Output Load Product Highlights + Lowest System Cost with Zero Standby (1 mW Output Power) Automatically enters low consumption power-down mode when load drops below ~0.2% of full load for LNK576 and ~0.6% for LNK574 Detects load reconnection and automatically restarts regulation Simple upgrade to existing LinkSwitch-LP designs Very accurate IC parameter tolerances improve system manu- facturing yield LNK574DG Suitable for low-cost clampless designs Frequency jittering greatly reduces EMI filter cost Extended package creepage improves system field reliability Advanced Protection/Safety Features (a) Typical Application Schematic for LNK574DG. Accurate hysteretic thermal shutdown protection automatic recovery reduces field returns Universal input range allows worldwide operation + + DC P < 0.00 W Auto-restart reduces delivered power by >85% during short-circuit IN Output at 325 VDC in and open-loop fault conditions Power-Down Simple ON/OFF control, no loop compensation needed Mode High bandwidth provides excellent transient load response with no overshoot EcoSmart Energy Efficient D FB No-load or standby (1 mW output power) consumption as low as OP1 LNK576DG BP/M <5 mW at 230 VAC input (Note 1) OP1 Easily meets all global energy efficiency regulations with no added S components ON/OFF control provides constant efficiency to very light loads Applications Shunt Regulator Chargers for cell/cordless phones, PDAs, power tools, MP3/portable audio devices, shavers, etc. Standby power supply for TV, video displays, and appliances PI-7230-052214 Description (b) Typical Application Schematic for LNK576DG. The LinkZero-LP controller incorporates new technology which Figure 1. Typical Applications Zero No-Load Charger (a) and Zero Standby enables the device to automatically enter into and wake up from Power Supply (b). no-load mode or with 1 mW load while taking less than 5 mW from the AC power. IEC 62301 specifies measurements of standby power to a minimum accuracy of 10 mW, and so LinkZero-LPs consumption of 1 Output Power Table substantially less than 5 mW at 230 VAC rounds to zero based on the 230 VAC 15% 85-265 VAC IEC definition. This low power level is also immeasurable on most 4 Product power meters. The accurately specified FEEDBACK (FB) pin voltage Open Open 2 2 Adapter Adapter 3 3 reference enables universal input primary-side regulated power Frame Frame supplies with accurate constant voltage from 5% to full load. The LNK574DG 3 W 3 W 3 W 3 W start-up and operating power are derived directly from the DRAIN pin LNK576DG 6 W 9 W 5 W 8 W which eliminates start-up circuitry. The internal oscillator frequency is jittered to significantly reduce both quasi-peak and average EMI, Table 1. Output Power Table. minimizing filter cost. Notes: 1. IEC 62301 Clause 4.5 rounds standby power use below 5 mW to zero. 2. Typical continuous power in a non-ventilated enclosed adapter measured at +50 C ambient. 3. Maximum practical continuous power in an open frame design with adequate heat sinking, measured at 50 C ambient. 4. Packages: D: SO-8C. www.power.com November 2015 This Product is Covered by Patents and/or Pending Patent Applications.LNK574/576 BYPASS/ DRAIN MULTI FUNCTION (D) (BP/M) REGULATOR 5.85 V OVERVOLTAGE PU PROTECTION + + + BYPASS PIN GENERATOR 3 V 6.5 V UNDERVOLTAGE 5.85 V FEEDBACK REF + 4.85 V 1.70 V - 1.37 V OPEN LOOP PULL UP FAULT CURRENT LIMIT AUTO-RESTART FEEDBACK COUNTER (FB) RESET JITTER + VI 0.9 V LIMIT S Q CLOCK DC MAX CC CUT BACK R Q ADJ 1.70 V - 0.9 V OSCILLATOR SYSTEM POWER LEADING POWER- DOWN/ EDGE DOWN RESTART EVENT BLANKING COUNTER COUNTER 160 or 416 f OSC CYCLES PU RESET SOURCE (S) PI-5509-032714 Figure 2 Functional Block Diagram. Pin Functional Description DRAIN (D) Pin: The power MOSFET drain connection provides internal operating current for both startup and steady-state operation. D Package (SO-8C) BYPASS/MULTI-FUNCTIONAL PROGRAMMABLE (BP/M) Pin: An external bypass capacitor for the internally generated 5.85 V 1 8 supply is connected to this pin. The value of capacitor establishes BP/M S the power-down period. The minimum value of capacitor is 0.1 mF. 2 7 FB S An overvoltage protection disables the switching if the current into 6 the pin exceeds 6.5 mA (I ). SD S 4 5 FEEDBACK (FB) Pin: D S During normal operation, switching of the power MOSFET is controlled by this pin. MOSFET switching is disabled when a voltage greater than an internal V reference voltage is applied to the FB FEEDBACK pin. PI-5507-060210 The V reference voltage is internally adjusted from 1.70 V at full FB Figure 3. Pin Configuration. load to 1.37 V at no-load in CV mode, and 1.70 V to 0.9 V in CC mode. Below 0.9 V the part enters auto-restart operation. SOURCE (S) Pin: This pin is the power MOSFET source connection. It is also the ground reference for the BYPASS and FEEDBACK pins. 2 Rev. D 11/15 www.power.com - +