LNK362-364 LinkSwitch-XT Family Energy Ef cient, Low Power Off-Line Switcher IC Product Highlights + Optimized for Lowest System Cost DC Output Proprietary IC trimming and transformer construction techniques enable Clampless designs with LNK362 for lower system cost, component count and higher LinkSwitch-XT Wide Range ef ciency LNK362 HV DC Input D FB Fully integrated auto-restart for short circuit and BP open loop protection S Self-biased supply saves transformer auxiliary winding and associated bias supply components Frequency jittering greatly reduces EMI a) Clampless yback converter with LNK362 PI-4086-081005 Meets HV creepage requirements between DRAIN and all other pins both on the PCB and at the package + DC Lowest component count switcher solution Output Features Superior to Linear/RCC Accurate hysteretic thermal shutdown protection LinkSwitch-XT Wide Range automatic recovery improves eld reliability LNK363-364 D HV DC Input FB Universal input range allows worldwide operation BP Simple ON/OFF control, no loop compensation needed S Eliminates bias winding simpler, lower cost transformer Very low component count higher reliability and single PI-4061-081005 b) Flyback converter with LNK363/4 side printed circuit board Auto-restart reduces delivered power by 95% during Figure 1. Typical Application with LinkSwitch-XT. short circuit and open loop fault conditions (4) High bandwidth provides fast turn-on with no overshoot OUTPUT POWER TABLE and excellent transient load response 230 VAC 15% 85-265 VAC (3) PRODUCT EcoSmart Extremely Energy-Ef cient Open Open (1) (1) Adapter Adapter (2) (2) Frame Frame Easily meets all global energy ef ciency regulations with no added components LNK362P/G/D 2.8 W 2.8 W 2.6 W 2.6 W No-load consumption <300 mW without bias winding at LNK363P/G/D 5 W 7.5 W 3.7 W 4.7 W 265 VAC input (<50 mW with bias winding) LNK364P/G/D 5.5 W 9 W 4 W 6 W ON/OFF control provides constant ef ciency to very light loads ideal for mandatory CEC regulations Table 1. Output Power Table. Notes: Applications 1. Minimum continuous power in a typical non-ventilated enclosed Chargers/adapters for cell/cordless phones, PDAs, digital adapter measured at 50 C ambient. cameras, MP3/portable audio players, and shavers 2. Minimum practical continuous power in an open frame design with adequate heat sinking, measured at 50 C ambient. Supplies for appliances, industrial systems, and metering 3. Packages: P: DIP-8B, G: SMD-8B, D: SO-8C. Please see Part Ordering Information. Description 4. See Key Application Considerations section for complete description of assumptions. LinkSwitch-XT incorporates a 700 V power MOSFET, oscillator, simple ON/OFF control scheme, a high-voltage switched current and operating power are derived directly from the DRAIN source, frequency jittering, cycle-by-cycle current limit and pin, eliminating the need for a bias winding and associated thermal shutdown circuitry onto a monolithic IC. The startup circuitry. November 2008 + +LNK362-364 BYPASS DRAIN (BP) (D) REGULATOR 5.8 V FAULT PRESENT AUTO- RESTART BYPASS PIN COUNTER UNDER-VOLTAGE + CLOCK 5.8 V - RESET 4.8 V CURRENT LIMIT 6.3 V COMPARATOR V I LIMIT JITTER CLOCK DC MAX THERMAL SHUTDOWN OSCILLATOR FEEDBACK V -V FB TH (FB) S Q R Q LEADING EDGE BLANKING SOURCE (S) PI-4232-110205 Figure 2. Functional Block Diagram. Pin Functional Description P Package (DIP-8B) DRAIN (D) Pin: G Package (SMD-8B) Power MOSFET drain connection. Provides internal operating D Package (SO-8C) current for both startup and steady-state operation. S 1 8 S BYPASS (BP) Pin: BP 1 8 S Connection point for a 0.1 F external bypass capacitor for the S 2 7 S 2 FB 7 S internally generated 5.8 V supply. If an external bias winding is 6 S BP 3 used, the current into the BP pin must not exceed 1 mA. 4 5 D S FB 4 5 D FEEDBACK (FB) Pin: 3a 3b During normal operation, switching of the power MOSFET is controlled by this pin. MOSFET switching is disabled when a PI-3491-120706 current greater than 49 A is delivered into this pin. Figure 3. Pin Con guration. SOURCE (S) Pin: This pin is the power MOSFET source connection. It is also the ground reference for the BYPASS and FEEDBACK pins. 2-2 2 2 Rev. E 11/08 - +