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LM2673SD-ADJ 데이터시트(PDF) 9 Page - Texas Instruments |
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LM2673SD-ADJ 데이터시트(HTML) 9 Page - Texas Instruments |
9 / 35 page LM2673 www.ti.com SNVS030N – APRIL 2000 – REVISED APRIL 2013 SOFTSTART A capacitor connected from pin 7 to ground allows for a slow turn-on of the switching regulator. The capacitor sets a time delay to gradually increase the duty cycle of the internal power switch. This can significantly reduce the amount of surge current required from the input supply during an abrupt application of the input voltage. If softstart is not required this pin should be left open circuited. Please see the Css SOFTSTART CAPACITOR section for further information regarding softstart capacitor values. DAP (VSON PACKAGE) The Die Attach Pad (DAP) can and should be connected to PCB Ground plane/island. For CAD and assembly guidelines refer to Application Note AN-1187 at www.ti.com/lsds/ti/analog/powermanagement/power_portal.page. DESIGN CONSIDERATIONS Figure 16. Basic Circuit for Fixed Output Voltage Applications Figure 17. Basic Circuit for Adjustable Output Voltage Applications Power supply design using the LM2673 is greatly simplified by using recommended external components. A wide range of inductors, capacitors and Schottky diodes from several manufacturers have been evaluated for use in designs that cover the full range of capabilities (input voltage, output voltage and load current) of the LM2673. A simple design procedure using nomographs and component tables provided in this data sheet leads to a working design with very little effort. Alternatively, the design software, LM267X Made Simple (version 6.0), can also be used to provide instant component selection, circuit performance calculations for evaluation, a bill of materials component list and a circuit schematic. Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM2673 |
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