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LTC4278CDKD Datasheet(PDF) 1 Page - Linear Technology |
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LTC4278CDKD Datasheet(HTML) 1 Page - Linear Technology |
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1 / 40 page  LTC4278 1 4278f • • • • 12mΩ 1μF 30.9Ω 24k 1.8k 38.3k 100k 10k 0.1μF 33pF 0.1μF 2.2nF 1μF tON SYNC PGDLY UVLO PWRGD SENSE– VCMP SENSE+ RCMP VNEG RCLASS SHDN VPORTP VPORTN ENDLY OSC LTC4278 GND FB VCC SG PG CCMP TO MICRO CONTROLLER • 47μF 0.18μH 5V 5A 100μF + + 3.01k 21.5k T2P 41.2k 294k 10μF 10μF 2.2μH EPC3472G-LF FDMS2572 HAT2169 54V FROM DATA PAIR AUXILIARY SUPPLY (10V TO 57V) 54V FROM SPARE PAIR + – + – ~ ~ 4278 TA01a BSS63LT1 PDS5100H 100k 680k + – ~ ~ TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION IEEE 802.3at PD with Synchronous No-Opto Flyback Controller and 12V Aux Support The LTC®4278 is an integrated Powered Device (PD) controller and switching regulator intended for high power IEEE 802.3at and 802.3af applications. With a wide input voltage range, the LTC4278 is specifically designed to sup- port PD applications that include a low-voltage auxiliary power input such as a 12V wall adaptor. The inclusion of a shutdown pin provides simple implementation of both PoE and auxiliary dominate applications. In addition, the LTC4278 supports both 1-event and 2-event classifications as defined by the IEEE, thereby allowing the use in a wide range of product configurations. The LTC4278 synchronous, current mode, flyback control- ler generates multiple supply rails in a single conversion step providing for the highest system efficiency while main- taining tight regulation across all outputs. The LTC4278 includes Linear Technology’s patented No-Opto feedback topology to provide full IEEE 802.3 isolation without the need of an opto-isolator circuit. A true soft-start function allows graceful ramp-up of all output voltages. The LTC4278 is available in a space saving 32-pin DFN package. n 25.5W IEEE 802.3at Compliant (Type 2) PD n 10V to 57V Auxiliary Power Input n Shutdown Pin for Flexible Auxiliary Power Support n Integrated State-of-the-Art No-Opto Synchronous Flyback Controller – Isolated Power Supply Efficiency >92% – 88% Efficiency Including Diode Bridge and Hot Swap™ FET n Superior EMI Performance n Robust 100V 0.7Ω (Typ) Integrated Hot Swap MOSFET n IEEE 802.3at High Power Available Indicator n Integrated Signature Resistor and Programmable Class Current n Undervoltage, Overvoltage and Thermal Protection n Short-Circuit Protection with Auto-Restart n Programmable Soft-Start and Switching Frequency n Complementary Power Good Indicators n Thermally Enhanced 7mm × 4mm DFN Package n VoIP Phones with Advanced Display Options n Dual-Radio Wireless Access Points n PTZ Security Cameras n RFID Readers n Industrial Controls 25W PD Solution with 12V Auxiliary L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5841643. |
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