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LM2592HVSX-3.3 Scheda tecnica(PDF) 3 Page - Texas Instruments

Il numero della parte LM2592HVSX-3.3
Spiegazioni elettronici  SIMPLE SWITCHER Power Converter 150-kHz 2-A Step-Down Voltage Regulator
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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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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