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LM2590HVS-ADJ Datasheet(PDF) 3 Page - Texas Instruments

Part # LM2590HVS-ADJ
Description  SIMPLE SWITCHER Power Converter
Download  35 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM2590HVS-ADJ Datasheet(HTML) 3 Page - Texas Instruments

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1
VIN
2
Output
3
Flag
4
Ground
5
Delay
6
Feedback
7
SD/SS
Not to scale
3
LM2590HV
www.ti.com
SNVS084C – DECEMBER 2001 – REVISED JULY 2016
Product Folder Links: LM2590HV
Submit Documentation Feedback
Copyright © 2001–2016, Texas Instruments Incorporated
5 Pin Configuration and Functions
NDZ Package
7-Pin TO-220
Top View
KTW Package
7-Pin TO-263
Top View
(1)
G = Ground, I = Input, O = Output
Pin Functions
PIN
TYPE(1)
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
Flag
O
Open collector output that goes active low (
≤1 V) when the output of the switching regulator is out of
regulation (less than 95% of its nominal value). In this state it can sink maximum 3 mA. When not
low, it can be pulled high to signal that the output of the regulator is in regulation (power good).
During power-up, it can be programmed to go high after a certain delay as set by the Delay pin (Pin
5). The maximum rating of this pin must not be exceeded, so if the rail to which it will be pulled-up to
is higher than 45 V, a resistive divider must be used instead of a single pull-up resistor, as indicated
in Test Circuits.
4
Ground
G
Circuit ground
5
Delay
O
This sets a programmable power-up delay from the moment that the output reaches regulation, to the
high signal output (power good) on Pin 3. A capacitor on this pin starts charging up by means on an
internal (3 μA) current source when the regulated output rises to within 5% of its nominal value. Pin 3
goes high (with an external pull-up) when the voltage on the capacitor on Pin 5 exceeds 1.3 V. The
voltage on this pin is clamped internally to about 1.7 V. If the regulated output drops out of regulation
(less than 95% of its nominal value), the capacitor on Pin 5 is rapidly discharged internally and Pin 3
will be forced low in about 1/1000th of the set power-up delay time.
6
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 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 Schottky diode to Ground is recommended for DC input voltages
above 40 V whenever a feedforward capacitor is present (see Test Circuits). Feedforward capacitor
values larger than 0.1 µF are not recommended for the same reason, whatever be the DC input
voltage.


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