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LM2594 데이터시트(PDF) 3 Page - Texas Instruments |
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LM2594 데이터시트(HTML) 3 Page - Texas Instruments |
3 / 41 page Not to scale 1 NC 8 Output 2 NC 7 +VIN 3 NC 6 Ground 4 Feedback 5 ON/OFF 3 LM2594, LM2594HV www.ti.com SNVS118D – DECEMBER 1999 – REVISED MAY 2016 Product Folder Links: LM2594 LM2594HV Submit Documentation Feedback Copyright © 1999–2016, Texas Instruments Incorporated (1) I = INPUT, O = OUTPUT 5 Description (continued) A standard series of inductors (both through-hole and surface-mount types) are available from several different manufacturers optimized for use with the LM2594xx series. This feature greatly simplifies the design of switch- mode power supplies. Other features include an ensured ±4% tolerance on output voltage under all conditions of input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 85-μA standby 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. The LM2594HV is for applications requiring an input voltage up to 60 V. 6 Pin Configuration and Functions D or P Package 8-Pin SOIC or PDIP Top View *No internal connection, but must be soldered to PCB for best heat transfer. ‡Patent Number 5,382,918. Pin Functions(1) PIN I/O DESCRIPTION NO. NAME 1, 2, 3 NC — No connection 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 80 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. 6 Ground — Circuit ground. 7 +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. 8 Output O Internal switch. The voltage at this pin switches between (+VIN − VSAT) and approximately −0.5 V, with a duty cycle of VOUT/VIN. To minimize coupling to sensitive circuitry, the PCB copper area connected to this pin must be kept to a minimum. |
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