LinkSwitch-II
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Dramatically Simplifi es CV Converters > ՕՕ ՕՕՕ Օ Օ Eliminates optocoupler and all secondary CV/CC control circuitry Eliminates all control loop compensation circuitryEnables Clampless > ՙ designs Advanced Performance Features > DS Compensates for cable voltage dropCompensates for external component temperature variationsVery tight IC parameter tolerances using proprietary trimming technology Frequency jittering greatly reduces EMI fi lter cost > FBBP/M LNK632DGWide RangeHV DC Input Advanced Protection/Safety Features EcoSmart Auto-restart protection reduces power delivered by about 85% for output short circuit and control loop faults (open and shorted components) Hysteretic thermal shutdown automatic recovery reduces power supply returns from the fi eld > PI-5346-022509 (a) Typical application schematic (b) Output characteristic V O ֱ5%18% Figure 1. Typical Application і Not a Simplifi ed Circuit (a) and Output Characteristic Envelope (b). Ζ Energy Effi cient Green Package Easily meets all global energy effi ciency regulations with no added componentsNo-load consumption down to <30 mW at 230 VAC input with bias winding ON/OFF control provides constant effi ciency down to very light loads ideal for EISA and ENERGY STAR regulations No current sense resistors ֖ maximizes effi ciency Halogen free and RoHS compliant package Applications > PI-5292-120908 I O Chargers for cell/cordless phones, PDAs, MP3/portable audio devices, adapters, etc. Output Power Table > 85-265 VAC Product 3 Adapter 1 Open Frame 2 LNK632DG 3.1 W3.1 W The LNK632DG dramatically simplifi es low power CV/CC charger designs by eliminating an optocoupler and secondary control circuitry. The device uses an ON/OFF control technique to provide very tight output voltage regulation, in addition to output current control ideal for battery charging applications. The combination of proprietary IC trimming and E-Shield > Table 1. Output Power Table. Notes: 1. Minimum continuous power in a typical non-ventilated enclosed adapter measured at +50 C ambient. 2. Maximum practical continuous power in an open frame design with adequate heatsinking, measured at 50 аC ambient. 3. Packages: D: SO-8C. transformer construction techniques enables Clampless designs with the LNK632DG when an external bias circuit is used.The device incorporates a 700 V power MOSFET, a novel ON/OFF control state machine, a high voltage switched current source for self biasing, frequency jittering, cycle-by-cycle current limit and hysteretic thermal shutdown circuitry onto a monolithic IC. > www.powerint.com February 2009 size="-1">

Constant Current Control (CC) Operation Constant Voltage (CV) Operation As the output voltage and therefore the Flyback voltage across the bias winding ramps up, the feedback pin voltage increases. The switching frequency is adjusted as the feedback pin voltage increases to provide a constant output current regulation. As the feedback pin approaches V > s) for a duration in excess of ~300 ms (auto-restart on-time (t The LNK632DG combines a high voltage power MOSFET switch with a power supply controller in one device. Similar to the LinkSwitch-LP and TinySwitch-III it uses a simple ON/OFF...

Control Functions (cont.)Minimum Switch ON-Time t T > J = 25 аC See Note 3700ns > ON(min) Feedback Pin Sampling Delay t T > J = 25 C See Figure 102.352.552.75 > FB s I > S1 FB Voltage > V > FBth 260330 DRAIN Supply Current FB Voltage = VFB -0.2, Switch ON-Time = t AI > TH S2 ON (MOSFET Switching at f > OSC )440520 BYPASS Pin Charge Current I > CH1 V > BP = 0 V -5-3.4-1.8mAI > CH2 V > BP = 4 V-4-2.3-1 BYPASS Pin Voltage V > BP 5.656.006.25V BYPASS Pin Voltage Hysteresis V > BPH 0.71.01.2V BYPASS Pin Shunt Voltage V I > SHUNT I > BP = 10 mA6.26.56.8V Circuit Protection Current Limit di/dt =...

OutputON-State Resistance = 25 а C4553 R > J DS(ON) I > D = 13 mAT T > J = 100 C6879 I V > DS = 560 V See Figure 11T > DSS1 OFF-State Leakage > J = 125 а C See Note 150 AI V > DS = 375 V See Figure 11T > DSS2 J = 50 C15 Breakdown Voltage BV T > J = 25 а CSee Figure 11700V > DSS DRAIN SupplyVoltage 50V Auto-RestartON-Time t V > FB = 0 See Note 3300ms > AR-ON Auto-RestartOFF-Time t > AR-OFF See Note 31.22.0s Open-Loop FB Pin Current Threshold I > OL See Note 3-120 A Open-Loop ON-Time See Note 360 sNOTES:I > DSS1 is the worst case OFF state leakage specifi cation at 80% of BV > DSS and maximum...

PI-5034-032108 C) PI-5031-032808 C) o o Frequency(Normalized to 25 Feedback Pin Voltage(Normalized to 25 > > > PI-4164-100505 PI-2213-012301 C) C) а tage (Normalized to 25 l o V own kd Current Limit (Normalized to 25 rea B > DRAIN Current (mA) Drain Capacitance (pF) >

LNK632DG > SDS V > OUT BP V > + + 10 F > SFBS IN V > BP 500 > + 2 V > PI-5347-122208 1) Raise V > BP voltage from 0 V to 6.2 V, down to 4.5 V, up to 6.2 V2) Raise V > IN until cycle skipping occurs at V > OUT to measure V > FBth 3) Reduce V > IN until cycle skipping stops at V > OUT to measure V > FBth- . Cable drop compensaion factor is > FB = V > FBth / V > FBth- 4) Apply 1.5 V at V > IN and measure t > FB delay from start of cycle falling edge to the next falling edge Figure 10. Test Set-up for Feedback Pin Meassurements. LNK632DG > SDSSFBS 5 F50 k 10 k > BP .1 F > PI-5348-122208 V > IN...