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LT1683 Datasheet(PDF) 1 Page - Linear Technology |
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LT1683 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  1 LT1683 1683f TYPICAL APPLICATIO APPLICATIO S DESCRIPTIO FEATURES Ultralow Noise Push-Pull DC/DC Controller The LT ®1683 is a switching regulator controller designed to lower conducted and radiated electromagnetic interfer- ence (EMI). Ultralow noise and EMI are achieved by controlling the voltage and current slew rates of external N-channel MOSFET switches. Current and voltage slew rates can be independently set to optimize harmonic content of the switching waveforms vs efficiency. The LT1683 can reduce high frequency harmonic power by as much as 40dB with only minor losses in efficiency. The LT1683 utilizes a dual output (push-pull) current mode architecture optimized for low noise topologies. The IC includes gate drivers and all necessary oscillator, control and protection circuitry. Unique error amp cir- cuitry can regulate both positive and negative voltages. The oscillator may be synchronized to an external clock for more accurate placement of switching harmonics. Protection features include gate drive lockout for low VIN, opposite gate lockout, soft-start, output current limit, short-circuit current limiting, gate drive overvoltage clamp and input supply undervoltage lockout. s Greatly Reduced Conducted and Radiated EMI s Low Switching Harmonic Content s Independent Control of Output Switch Voltage and Current Slew Rates s Greatly Reduced Need for External Filters s Dual N-Channel MOSFET Drivers s 20kHz to 250kHz Oscillator Frequency s Easily Synchronized to External Clock s Regulates Positive and Negative Voltages s Easier Layout Than with Conventional Switchers s Power Supplies for Noise Sensitive Communication Equipment s EMI Compliant Offline Power Supplies s Precision Instrumentation Systems s Isolated Supplies for Industrial Automation s Medical Instruments s Data Acquisition Systems , LTC and LT are registered trademarks of Linear Technology Corporation. A B MBRS340 MIDCOM 31244 22 µH 150 µF OS-CON MBRS340 MBR0530 22 µH OPTIONAL 2 ×100µF POSCAP 5V/2A 3 10 1683 TA01 11 13 SHDN CAP A NFB LT1683 GND VIN 17 14 2 GCL SS V5 SYNC GATE A 5 1 CT CAP B 6 18 RT GATE B 7 19 8 RCSL 16 VC 15 12 RVSL CS 4 PGND 20 FB 9 5pF 5pF Si9422 Si9422 0.1 Ω 976 Ω 23.2k 10nF 1.5k 3.3k 25k 25k 3.3k 16.9k 1.2nF 39 µF 63V 48V 68 µF 20V 11V 8.2V 51k 510 Ω 0.5W 2N3904 1N4148 10 µF 20V 30pF 22nF 0.22 µF 7.50k 2.49k FZT853 10pF 200V 30pF 10pF 200V Ultralow Noise 48V to 5V DC/DC Converter 5V Output Noise (Bandwidth = 100MHz) A 200 µV/DIV B 20mV/DIV 200 µVP-P 5 µs/DIV 1683 TA01a |
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