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LM2595 数据表(PDF) 3 Page - Texas Instruments |
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LM2595 数据表(HTML) 3 Page - Texas Instruments |
3 / 43 page 3 LM2595 www.ti.com SNVS122C – MAY 1999 – REVISED MAY 2016 Product Folder Links: LM2595 Submit Documentation Feedback Copyright © 1999–2016, Texas Instruments Incorporated 5 Description (continued) A standard series of inductors are available from several different manufacturers optimized for use with the LM2595 series. This feature greatly simplifies the design of switch-mode power supplies. Other features include a ±4% tolerance on output voltage under specified input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 85-μA stand- by current. Self protection features include a two stage frequency reducing current limit for the output switch and an overtemperature shutdown for complete protection under fault conditions. 6 Pin Configuration and Functions NDH Package 5–Pin TO-220 Top View KTT Package 5-Pin TO-263 Top View Pin Functions PIN I/O DESCRIPTION NO. NAME 1 Output O Internal switch. The voltage at this pin switches between (+VIN − VSAT) and approximately –0.5 V, with a duty cycle of approximately VOUT/VIN. To minimize coupling to sensitive circuitry, the PCB copper area connected to this pin must be kept to a minimum. 2 +VIN I This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching currents needed by the regulator. 3 Ground — Circuit ground. 4 Feedback I Senses the regulated output voltage to complete the feedback loop. 5 ON/OFF I Allows the switching regulator circuit to be shut down using logic level signals, thus dropping the total input supply current to approximately 85 μA. Pulling this pin below a threshold voltage of approximately 1.3 V turns the regulator on, and pulling this pin above 1.3 V (up to a maximum of 25 V) shuts the regulator down. If this shutdown feature is not needed, the ON/OFF pin can be wired to the ground pin or it can be left open, in either case the regulator is in the ON condition. |
类似零件编号 - LM2595 |
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类似说明 - LM2595 |
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