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LM3477A 데이터시트(PDF) 1 Page - National Semiconductor (TI) |
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LM3477A 데이터시트(HTML) 1 Page - National Semiconductor (TI) |
1 / 23 page LM3477/LM3477A High Efficiency High-Side N-Channel Controller for Switching Regulator General Description The LM3477/A is a high-side N-channel MOSFET switching regulator controller. It can be used in topologies requiring a high side MOSFET such as buck, inverting (buck-boost) and zeta regulators. The LM3477/A’s internal push pull driver allows compatibility with a wide range of MOSFETs. This, the wide input voltage range, use of discrete power components and adjustable current limit allows the LM3477/A to be opti- mized for a wide variety of applications. The LM3477/A uses a high switching frequency of 500kHz to reduce the overall solution size. Current-mode control re- quires only a single resistor and capacitor for frequency compensation. The current mode architecture also yields superior line and load regulation and cycle-by-cycle current limiting. A 5µA shutdown state can be used for power sav- ings and for power supply sequencing. Other features in- clude internal soft-start and output over voltage protection. The internal soft-start reduces inrush current. Over voltage protection is a safety feature to ensure that the output volt- age stays within regulation. The LM3477A is similar to the LM3477. The primary differ- ence between the two is the point at which the device transitions into hysteretic mode. The hysteretic threshold of the LM3477A is one-third of the LM3477. Features n 500kHz switching frequency n Adjustable current limit n 1.5% reference n Thermal shutdown n Frequency compensation optimized with a single capacitor and resistor n Internal softstart n Current mode operation n Undervoltage lockout with hysteresis n 8-lead Mini-SO8 (MSOP-8) package Applications n Local Voltage Regulation n Distributed Power n Notebook and Palmtop Computers n Internet Appliances n Printers and Office Automation n Battery operated Devices n Cable Modems n Battery Chargers Hysteretic Threshold LM3477 ) 36% of programmed current limit LM3477A ) 12% of programmed current limit *See Hysteretic Threshold and section for more information. Typical Application Circuit 20003333 Typical High Efficiency Step-Down (Buck) Converter June 2002 © 2002 National Semiconductor Corporation DS200033 www.national.com |
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