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LM2591HV Datasheet(PDF) 9 Page - National Semiconductor (TI) |
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LM2591HV Datasheet(HTML) 9 Page - National Semiconductor (TI) |
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9 / 20 page  Block Diagram 10129383 Pin Functions +V IN (Pin 1) — 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. Output (Pin 2) — Internal switch. The voltage at this pin switches between approximately (+V IN −VSAT) and approxi- mately −0.5V, with a duty cycle of V OUT/VIN. Ground (Pin 3) — Circuit ground. Feedback (Pin 4) — 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 1.23V by means of a resistive divider from the output for the Adjustable version. If a feedforward capacitor is used (Ad- justable 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 since 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 Schot- tky diode to Ground is recommended for DC input voltages above 40V whenever a feedforward capacitor is present (See Figure 1). Feedforward capacitor values larger than 0.1 µF are not recommended for the same reason, whatever be the DC input voltage. ON /OFF (Pin 5) — The regulator is in shutdown mode, drawing about 90 µA, when this pin is driven to a high level ( ≥ 2.0V), and is in normal operation when this Pin is left floating or driven to a low level ( ≤ 0.6V). The typical value of the threshold is 1.3V and the voltage on this pin must not exceed 25V. www.national.com 9 |
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