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LT1680I Datasheet(PDF) 1 Page - Linear Technology |
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LT1680I Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LT1680 High Power DC/DC Step-Up Controller s High Voltage: Operation Up to 60V Max s High Current: N-Channel Drive Handles Up to 10,000pF Gate Capacitance s Programmable Average Current Limiting s 5V Reference Output with 10mA External Loading Capability s Fixed Frequency Current Mode Operation s Oscillator Synchronizable Up to 200kHz s Undervoltage Lockout with Hysteresis s Programmable Start Inhibit for Power Supply Sequencing and Protection s User Adjustable Slope Compensation FEATURES DESCRIPTION The LT ®1680 is a high power, current mode switching power supply controller optimized for boost topologies. The IC drives N-channel MOSFET switches for DC/DC converters in applications up to 60V input. A high current gate drive output handles up to 10,000pF gate capaci- tance, enabling the construction of high power DC/DC converters. Current sense common mode range up to 60V allows current sensing to be referenced to the input supply, eliminating the need for sense blanking circuits. The LT1680 incorporates programmable average current limiting allowing accurate limiting of DC current in the magnetics, independent of ripple current . User adjustable slope compensation provides stable operation at duty cycles up to 90%. The LT1680 operating frequency is programmable and can be synchronized up to 200kHz. Minimum off-time operation provides switch protection. The IC also incorpo- rates a soft start feature that is gated by both shutdown and undervoltage lockout conditions. APPLICATIONS s High Power Single Board Systems s Distributed Power Converters s Industrial Control Systems s Lead-Acid Battery Back-Up Systems s Automotive and Heavy Equipment , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATION 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 SL/ADJ CT IAVG SS VC SGND VFB VREF 5VREF SYNC 12VIN GATE PGND RUN/SHDN SENSE – SENSE + + LT1680 MBR0520 RCT 15k R7 2k RVC 4.7k 1N914 CCT 1nF C3 2.2nF CVC 4.7nF C4 0.22 µF C2 1 µF C11 1nF 1680 TA01 C6 0.1 µF R6 75k R9 100k C12 1 µF M1 IRFZ44 ×3 D1 MBR20100CT ×2 + CIN 680 µF 25V ×4 COUT 680 µF 63V ×3 VOUT 48V 5.2A L1 25 µH RSENSE 0.005 Ω 12VIN 10V TO 15V 24A (DC) + L1: Kool M µ®, 18T #14 ON 77314-A7 Kool M µ IS A REGISTERED TRADEMARK OF MAGNETICS, INC. 12V to 48V, 250W Boost OUTPUT POWER (W) 0 90 95 100 200 1680 TA02 85 80 75 50 100 150 250 VOUT = 48V Efficiency vs Output Power |
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