Moteur de recherche de fiches techniques de composants électroniques
  French  ▼
ALLDATASHEET.FR

X  

LM2575TV-15 Fiches technique(PDF) 8 Page - ON Semiconductor

No de pièce LM2575TV-15
Description  1.0 A, Adjustable Output Voltage, Step-Down Switching Regulator
Download  26 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LM2575TV-15 Fiches technique(HTML) 8 Page - ON Semiconductor

Back Button LM2575TV-15 Datasheet HTML 4Page - ON Semiconductor LM2575TV-15 Datasheet HTML 5Page - ON Semiconductor LM2575TV-15 Datasheet HTML 6Page - ON Semiconductor LM2575TV-15 Datasheet HTML 7Page - ON Semiconductor LM2575TV-15 Datasheet HTML 8Page - ON Semiconductor LM2575TV-15 Datasheet HTML 9Page - ON Semiconductor LM2575TV-15 Datasheet HTML 10Page - ON Semiconductor LM2575TV-15 Datasheet HTML 11Page - ON Semiconductor LM2575TV-15 Datasheet HTML 12Page - ON Semiconductor Next Button
Zoom Inzoom in Zoom Outzoom out
 8 / 26 page
background image
LM2575
http://onsemi.com
8
PIN FUNCTION DESCRIPTION
Pin
Symbol
Description (Refer to Figure 1)
1
Vin
This pin is the positive input supply for the LM2575 step−down switching regulator. In order to minimize
voltage transients and to supply the switching currents needed by the regulator, a suitable input bypass
capacitor must be present (Cin in Figure 1).
2
Output
This is the emitter of the internal switch. The saturation voltage Vsat of this output switch is typically 1.0 V.
It should be kept in mind that the PCB area connected to this pin should be kept to a minimum in order to
minimize coupling to sensitive circuitry.
3
GND
Circuit ground pin. See the information about the printed circuit board layout.
4
Feedback
This pin senses regulated output voltage to complete the feedback loop. The signal is divided by the
internal resistor divider network R2, R1 and applied to the non−inverting input of the internal error amplifier.
In the Adjustable version of the LM2575 switching regulator this pin is the direct input of the error amplifier
and the resistor network R2, R1 is connected externally to allow programming of the output voltage.
5
ON/OFF
It allows the switching regulator circuit to be shut down using logic level signals, thus dropping the total
input supply current to approximately 80
mA. The input threshold voltage is typically 1.4 V. Applying a
voltage above this value (up to +Vin) shuts the regulator off. If the voltage applied to this pin is lower than
1.4 V or if this pin is connected to ground, the regulator will be in the “on” condition.
DESIGN PROCEDURE
Buck Converter Basics
The LM2575 is a “Buck” or Step−Down Converter which
is the most elementary forward−mode converter. Its basic
schematic can be seen in Figure 15.
The operation of this regulator topology has two distinct
time periods. The first one occurs when the series switch is
on, the input voltage is connected to the input of the inductor.
The output of the inductor is the output voltage, and the
rectifier (or catch diode) is reverse biased. During this
period, since there is a constant voltage source connected
across the inductor, the inductor current begins to linearly
ramp upwards, as described by the following equation:
I
L(on) +
V
in
–Vout ton
L
During this “on” period, energy is stored within the core
material in the form of magnetic flux. If the inductor is
properly designed, there is sufficient energy stored to carry
the requirements of the load during the “off” period.
Figure 15. Basic Buck Converter
D1
Vin
Vout
RLoad
L
Cout
Power
Switch
The next period is the “off” period of the power switch.
When the power switch turns off, the voltage across the
inductor reverses its polarity and is clamped at one diode
voltage drop below ground by catch dioded. Current now
flows through the catch diode thus maintaining the load
current loop. This removes the stored energy from the
inductor.
The inductor current during this time is:
I
L(off) +
Vout –VD toff
L
This period ends when the power switch is once again
turned on. Regulation of the converter is accomplished by
varying the duty cycle of the power switch. It is possible to
describe the duty cycle as follows:
d
+
ton
T
, where T is the period of switching.
For the buck converter with ideal components, the duty
cycle can also be described as:
d
+
Vout
V
in
Figure 16 shows the buck converter idealized waveforms
of the catch diode voltage and the inductor current.
Power
Switch
Figure 16. Buck Converter Idealized Waveforms
Power
Switch
Off
Power
Switch
Off
Power
Switch
On
Power
Switch
On
Von(SW)
VD(FWD)
Time
Time
ILoad(AV)
Imin
Ipk
Diode
Diode
Power
Switch


Numéro de pièce similaire - LM2575TV-15

FabricantNo de pièceFiches techniqueDescription
logo
ON Semiconductor
LM2575TV-012G ONSEMI-LM2575TV-012G Datasheet
497Kb / 28P
   1.0 A, Adjustable Output Voltage, Step-Down Switching Regulator
June, 2009 ??Rev. 11
LM2575TV-012G ONSEMI-LM2575TV-012G Datasheet
497Kb / 28P
   1.0 A, Adjustable Output Voltage, Step-Down Switching Regulator
June, 2009 ??Rev. 11
LM2575TV-015 ONSEMI-LM2575TV-015 Datasheet
364Kb / 28P
   1.0 A, Adjustable Output Voltage, Step?묭own Switching Regulator
November, 2005 ??Rev. 8
LM2575TV-015G ONSEMI-LM2575TV-015G Datasheet
364Kb / 28P
   1.0 A, Adjustable Output Voltage, Step?묭own Switching Regulator
November, 2005 ??Rev. 8
LM2575TV-015G ONSEMI-LM2575TV-015G Datasheet
497Kb / 28P
   1.0 A, Adjustable Output Voltage, Step-Down Switching Regulator
June, 2009 ??Rev. 11
More results

Description similaire - LM2575TV-15

FabricantNo de pièceFiches techniqueDescription
logo
ON Semiconductor
LM2575T-15G ONSEMI-LM2575T-15G Datasheet
497Kb / 28P
   1.0 A, Adjustable Output Voltage, Step-Down Switching Regulator
June, 2009 ??Rev. 11
LM2575T-005G ONSEMI-LM2575T-005G Datasheet
461Kb / 28P
   1.0 A, Adjustable Output Voltage, Step-Down Switching Regulator
June, 2009 ??Rev. 11
LM2575 ONSEMI-LM2575_09 Datasheet
497Kb / 28P
   1.0 A, Adjustable Output Voltage, Step-Down Switching Regulator
June, 2009 ??Rev. 11
LM2575T-ADJ ONSEMI-LM2575T-ADJ Datasheet
497Kb / 28P
   1.0 A, Adjustable Output Voltage, Step-Down Switching Regulator
June, 2009 ??Rev. 11
LM2575 ONSEMI-LM2575_05 Datasheet
364Kb / 28P
   1.0 A, Adjustable Output Voltage, Step?묭own Switching Regulator
November, 2005 ??Rev. 8
LM2575D2T-005 ONSEMI-LM2575D2T-005 Datasheet
461Kb / 28P
   1.0 A, Adjustable Output Voltage, Step-Down
June, 2009 ??Rev. 11
LM2574 ONSEMI-LM2574 Datasheet
279Kb / 28P
   0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator
February, 2002 ??Rev. 5
LM2574 ONSEMI-LM2574_15 Datasheet
234Kb / 26P
   0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator
January, 2015 ??Rev. 9
LM2595 ONSEMI-LM2595 Datasheet
572Kb / 25P
   1.0 A, Step-Down Switching Regulator
February, 2009 ??Rev. 2
LM2574 ONSEMI-LM2574_06 Datasheet
296Kb / 26P
   0.5 A, Adjustable Output Voltage, Step?묭own Switching Regulator
August, 2006 ??Rev. 8
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26


Fiches technique Télécharger

Go To PDF Page


Lien URL




Politique de confidentialité
ALLDATASHEET.FR
ALLDATASHEET vous a-t-il été utile ?  [ DONATE ] 

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Echange de liens   |   Fabricants
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com