LNK562-564 LinkSwitch-LP Energy Ef cient Off-Line Switcher IC for Linear Transformer Replacement Product Highlights + DC Lowest System Cost and Advanced Safety Features AC Output IN Lowest component count switcher Very tight parameter tolerances using proprietary IC trimming technology and transformer construction techniques enable Clamplessdesigns decreases D FB component count/system cost and increases ef ciency LinkSwitch-LP BP Meets industry standard requirements for thermal overload S protection eliminates the thermal fuse used with linear transformers or additional components in RCC designs (a) PI-3923-092705 Frequency jittering greatly reduces EMI enables low cost V input lter con guration O Meets HV creepage requirements between DRAIN and all Rated Output Power = V I R R other pins, both on the PCB and at the package V R Proprietary E-Shield transformer eliminates Y-capacitor Superior Performance over Linear and RCC Hysteretic thermal shutdown protection automatic recovery improves eld reliability Universal input range allows worldwide operation I I R O Auto-restart reduces delivered power by >85% during (b) PI-3924-011706 short circuit and open loop fault conditions Simple ON/OFF control, no loop compensation needed Figure 1. Typical Application not a Simpli ed Circuit (a) and High bandwidth provides fast turn on with no overshoot Output Characteristic Envelope (b). and excellent transient load response EcoSmart Energy Ef ciency Technology 1 OUTPUT POWER TABLE Easily meets all global energy ef ciency regulations with 230 VAC 15% 85-265 VAC no added components 4 PRODUCT Open Open No-load consumption <150 mW at 265 VAC input 2 2 Adapter Adapter 3 3 Frame Frame ON/OFF control provides constant ef ciency to very light loads ideal for mandatory CEC regulations LNK562P/G/D 1.9 W 1.9 W 1.9 W 1.9 W LNK563P/G/D 2.5 W 2.5 W 2.5 W 2.5 W Applications Chargers for cell/cordless phones, PDAs, power tools, LNK564P/G/D 3 W 3 W 3 W 3 W MP3/portable audio devices, shavers etc. Table 1. Output Power Table. Standby and auxiliary supplies Notes: 1. Output power may be limited by speci c application parameters Description including core size and Clampless operation (see Key Application LinkSwitch-LP switcher ICs cost effectively replace all Considerations). 2. Minimum continuous power in a typical non-ventilated enclosed unregulated isolated linear transformer based (50/60 Hz) power adapter measured at 50 C ambient. supplies up to 3 W output power. For worldwide operation, a 3. Minimum practical continuous power in an open frame design with single universal input design replaces multiple linear transformer adequate heat sinking, measured at 50 C ambient. 4. Packages: P: DIP-8B, G: SMD-8B, D: SO-8C. For lead-free based designs. The self-biased circuit achieves an extremely low package options, see Part Ordering Information. no-load consumption of under 150 mW. The internal oscillator frequency is jittered to signi cantly reduce both quasi-peak and average EMI, minimizing lter cost. November 2008LNK562-564 BYPASS DRAIN (BP) (D) REGULATOR 5.8 V AUTO-RESTART BYPASS PIN COUNTER FAULT UNDER-VOLTAGE 0.8 V PRESENT + RESET + 5.8 V - 4.85 V CURRENT LIMIT COMPARATOR 6.3 V V I LIMIT JITTER CLOCK DC MAX ADJ THERMAL SHUTDOWN OSCILLATOR FEEDBACK 1.69 V -V TH (FB) S Q OPEN LOOP R Q PULLDOWN LEADING EDGE BLANKING PI-3958-092905 SOURCE (S) Figure 2. Functional Block Diagram. Pin Functional Description DRAIN (D) Pin: P Package (DIP-8B) The power MOSFET drain connection provides internal G Package (SMD-8B) D Package (SO-8C) operating current for both startup and steady-state operation. BYPASS (BP) Pin: S 1 8 S BP 1 8 S A 0.1 F external bypass capacitor for the internally generated S 2 7 FB 2 7 S S 5.8 V supply is connected to this pin. BP 3 6 S FEEDBACK (FB) Pin: FB D 4 5 D 4 5 S During normal operation, switching of the power MOSFET is controlled by this pin. MOSFET switching is disabled when a current greater than 70 A ows into this pin. PI-4547-011107 SOURCE (S) Pin: Figure 3. Pin Con guration. This pin is the power MOSFET source connection. It is also the ground reference for the BYPASS and FEEDBACK pins. protection, frequency jittering, current limit circuit, and leading LinkSwitch-LP Functional edge blanking. Description LinkSwitch-LP comprises a 700 V power MOSFET switch with Oscillator a power supply controller on the same die. Unlike conventional The typical oscillator frequency is internally set to an average PWM (pulse width modulation) controllers, it uses a simple of 66/83/100 kHz for the LNK562, 563 & 564 respectively. ON/OFF control to regulate the output voltage. The controller Two signals are generated from the oscillator: the maximum consists of an oscillator, feedback (sense and logic) circuit, 5.8 duty cycle signal (DC ) and the clock signal that indicates MAX V regulator, BYPASS pin undervoltage circuit, over-temperature the beginning of each switching cycle. 2 Rev. H 11/08 - +