LT8315 560VIN Micropower No-Opto Isolated Flyback Converter with 630V/300mA Switch FEATURESDESCRIPTION n Wide Input Voltage Range: 18V to 560V The LT®8315 is a high voltage flyback converter with inte- n 630V/300mA Integrated Power Switch grated 630V/300mA switch. No opto-isolator is needed for n No Opto-Isolator Required for Regulation regulation. The device samples the output voltage from the n Quasi-Resonant Boundary Mode Operation isolated flyback waveform appearing across a third wind- n Constant-Current and Constant-Voltage Regulation ing on the transformer. Quasi-resonant boundary mode n Low Ripple Light Load Burst Mode® Operation operation improves load regulation, reduces transformer n Low Quiescent Current: 70μA size and maintains high efficiency. n Programmable Current Limit and Soft-Start At start-up, the LT8315 charges its INTVCC capacitor via a n TSSOP Package with High Voltage Spacing current source attached to the DRAIN pin. During normal operation, the current source turns off and the device APPLICATIONS draws its power from a third winding on the transformer. n The LT8315 operates from a wide range of input supply Isolated Telecom, Automotive, Industrial, Medical voltages and can deliver up to 15W of power. It is available Power Supplies n in a thermally enhanced 20-pin TSSOP package with four Isolated Off Line Housekeeping Power Supplies n pins removed for high voltage spacing. Electric Vehicles and Battery Stacks All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION20VIN to 450VIN Isolated 12VOUT SupplyEfficiency VIN 90 20V TO 450V 0.44µF 600Ω 5:1:2 80 20k + 640µH VOUT 70 93.1k 12V 47pF 60 10µF 160µH 200µF BIAS DCM V EN/UVLO FB EFFICIENCY (%) IN = 50V V – 50 OUT VIN = 100V 4mH 61.9k 5.11k VIN = 150V INTVCC 5mA to 220mA (VIN = 50V) V 40 IN = 250V 10µF TC LT8315 5mA to 320mA (VIN = 100V) VIN = 350V 5mA to 380mA (VIN = 150V) VIN = 450V SMODE DRAIN 5mA to 440mA (VIN > 250V) 30 0 100 200 300 400 500 VC SOURCE LOAD CURRENT (mA) 8315 TA01b 100k IREG/SS GND 330mΩ 470pF 22nF 121k 8315 TA01a 8315fa For more information www.linear.com/LT8315 1 Document Outline FEATURES APPLICATIONS DESCRIPTION TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM OPERATION APPLICATIONS INFORMATION PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS
