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LM2592HVSX-3.3 데이터시트(PDF) 3 Page - Texas Instruments |
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LM2592HVSX-3.3 데이터시트(HTML) 3 Page - Texas Instruments |
3 / 31 page 3 LM2592HV www.ti.com SNVS075E – MAY 2001 – REVISED MAY 2016 Product Folder Links: LM2592HV Submit Documentation Feedback Copyright © 2001–2016, Texas Instruments Incorporated 5 Description (continued) Features include a ±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 90- μA standby current. Self-protection features include a two stage current limit for the output switch and an over temperature shutdown for complete protection under fault conditions. 6 Pin Configuration and Functions KTT Package 5-Pin DDPAK/TO-26 Top View NDH Package 5-Pin TO-220 Top View Pin Functions PIN I/O DESCRIPTION NO. NAME 1 +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. 2 Output O Internal switch. The voltage at this pin switches between approximately (+VIN − VSAT) and approximately −0.5 V, with a duty cycle of VOUT/VIN. 3 Ground — Circuit ground. 4 Feedback I Senses the regulated output voltage to complete the feedback loop. This pin is directly connected to the Output for the fixed voltage versions, but is set to 1.23 V by means of a resistive divider from the output for the Adjustable version. If a feedforward capacitor is used (Adjustable version), then a negative voltage spike is generated on this pin whenever the output is shorted. This happens because the feedforward capacitor cannot discharge fast enough, and because one end of it is dragged to Ground, the other end goes momentarily negative. To prevent the energy rating of this pin from being exceeded, a small-signal Schottky diode to Ground is recommended for DC input voltages above 40 V whenever a feedforward capacitor is present (See Parameter Measurement Information). Feedforward capacitor values larger than 0.1 μF are not recommended for the same reason, whatever be the DC input voltage. 5 ON /OFF I The regulator is in shutdown mode, drawing about 90 μA, when this pin is driven to a high level ( ≥ 2 V), and is in normal operation when this Pin is left floating or driven to a low level ( ≤ 0.6 V). The typical value of the threshold is 1.3 V and the voltage on this pin must not exceed 25 V. |
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