Motore di ricerca datesheet componenti elettronici
  Italian  ▼
ALLDATASHEETIT.COM

X  

LM2574DW-ADJ Scheda tecnica(PDF) 11 Page - ON Semiconductor

Il numero della parte LM2574DW-ADJ
Spiegazioni elettronici  0.5 A, Adjustable Output Voltage, Step?묭own Switching Regulator
Download  26 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Produttore elettronici  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LM2574DW-ADJ Scheda tecnica(HTML) 11 Page - ON Semiconductor

Back Button LM2574DW-ADJ Datasheet HTML 7Page - ON Semiconductor LM2574DW-ADJ Datasheet HTML 8Page - ON Semiconductor LM2574DW-ADJ Datasheet HTML 9Page - ON Semiconductor LM2574DW-ADJ Datasheet HTML 10Page - ON Semiconductor LM2574DW-ADJ Datasheet HTML 11Page - ON Semiconductor LM2574DW-ADJ Datasheet HTML 12Page - ON Semiconductor LM2574DW-ADJ Datasheet HTML 13Page - ON Semiconductor LM2574DW-ADJ Datasheet HTML 14Page - ON Semiconductor LM2574DW-ADJ Datasheet HTML 15Page - ON Semiconductor Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 26 page
background image
LM2574, NCV2574
http://onsemi.com
11
Procedure (Fixed Output Voltage Version) (continued) In order to simplify the switching regulator design, a step−by−step
design procedure and example is provided.
Procedure
Example
5. Output Capacitor Selection (Cout)
A. Since the LM2574 is a forward−mode switching regulator
with voltage mode control, its open loop 2−pole−1−zero
frequency characteristic has the dominant pole−pair
determined by the output capacitor and inductor values. For
stable operation and an acceptable ripple voltage,
(approximately 1% of the output voltage) a value between
100
mF and 470 mF is recommended.
B. Due to the fact that the higher voltage electrolytic capacitors
generally have lower ESR (Equivalent Series Resistance)
numbers, the output capacitor’s voltage rating should be at
least 1.5 times greater than the output voltage. For a 5.0 V
regulator, a rating at least 8.0 V is appropriate, and a 10 V
or 16 V rating is recommended.
5. Output Capacitor Selection (Cout)
A. Cout = 100 mF to 470 mF standard aluminium electrolytic.
B. Capacitor voltage rating = 20 V.
Procedure (Adjustable Output Version: LM2574−ADJ)
Procedure
Example
Given Parameters:
Vout = Regulated Output Voltage
Vin(max) = Maximum DC Input Voltage
ILoad(max) = Maximum Load Current
Given Parameters:
Vout = 24 V
Vin(max) = 40 V
ILoad(max) = 0.4 A
1. Programming Output Voltage
To select the right programming resistor R1 and R2 value (see
Figure 2) use the following formula:
where Vref = 1.23 V
Resistor R1 can be between 1.0 k
W and 5.0 kW. (For best
temperature coefficient and stability with time, use 1% metal
film resistors).
Vout + Vref 1.0 )
R2
R1
R2
+ R1
Vout
V
ref
* 1.0
1. Programming Output Voltage (selecting R1 and R2)
Select R1 and R2 :
Vout = 1.23
Select R1 = 1.0 k
W
R2 = 18.51 k
W, choose a 18.7 kW metal film resistor.
1.0
)
R2
R1
R2
+ R1
Vout
V
ref
* 1.0 + 1.0 k
10 V
1.23 V
* 1.0
2. Input Capacitor Selection (Cin)
To prevent large voltage transients from appearing at the input
and for stable operation of the converter, an aluminium or
tantalum electrolytic bypass capacitor is needed between the
input pin +Vin and ground pin Gnd. This capacitor should be
located close to the IC using short leads. This capacitor should
have a low ESR (Equivalent Series Resistance) value.
For additional information see input capacitor section in the
“EXTERNAL COMPONENTS” section of this data sheet.
2. Input Capacitor Selection (Cin)
A 22
mF aluminium electrolytic capacitor located near the
input and ground pin provides sufficient bypassing.
3. Catch Diode Selection (D1)
A. Since the diode maximum peak current exceeds the
regulator maximum load current the catch diode current
rating must be at least 1.2 times greater than the maximum
load current. For a robust design, the diode should have a
current rating equal to the maximum current limit of the
LM2574 to be able to withstand a continuous output short.
B. The reverse voltage rating of the diode should be at least
1.25 times the maximum input voltage.
3. Catch Diode Selection (D1)
A. For this example, a 1.0 A current rating is adequate.
B. Use a 50 V MBR150 Schottky diode or any suggested
fast recovery diodes in Table 1.


Codice articolo simile - LM2574DW-ADJ

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
ON Semiconductor
LM2574DW-ADJ ONSEMI-LM2574DW-ADJ Datasheet
279Kb / 28P
   0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator
February, 2002 ??Rev. 5
LM2574DW-ADJ ONSEMI-LM2574DW-ADJ Datasheet
234Kb / 26P
   0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator
January, 2015 ??Rev. 9
LM2574DW-ADJR2 ONSEMI-LM2574DW-ADJR2 Datasheet
279Kb / 28P
   0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator
February, 2002 ??Rev. 5
LM2574DW-ADJR2 ONSEMI-LM2574DW-ADJR2 Datasheet
234Kb / 26P
   0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator
January, 2015 ??Rev. 9
LM2574DW-ADJR2G ONSEMI-LM2574DW-ADJR2G Datasheet
234Kb / 26P
   0.5 A, Adjustable Output Voltage, Step-Down Switching Regulator
January, 2015 ??Rev. 9
More results

Descrizione simile - LM2574DW-ADJ

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
ON Semiconductor
LM2575 ONSEMI-LM2575_05 Datasheet
364Kb / 28P
   1.0 A, Adjustable Output Voltage, Step?묭own Switching Regulator
November, 2005 ??Rev. 8
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
logo
KODENSHI_AUK CORP.
SN317MPI KODENSHI-SN317MPI Datasheet
376Kb / 8P
   [ 0.5 A Adjustable Output ] Positive Voltage Regulator
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
LM2575 ONSEMI-LM2575 Datasheet
382Kb / 26P
   1.0 A, Adjustable Output Voltage, Step-Down Switching Regulator
May, 2004 ??Rev. 6
LM2575T-ADJ ONSEMI-LM2575T-ADJ Datasheet
497Kb / 28P
   1.0 A, Adjustable Output Voltage, Step-Down Switching Regulator
June, 2009 ??Rev. 11
LM2576 ONSEMI-LM2576_06 Datasheet
276Kb / 28P
   3.0 A, 15 V, Step?묭own Switching Regulator
January, 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


Scheda tecnica Scarica

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEETIT.COM
Lei ha avuto il aiuto da alldatasheet?  [ DONATE ] 

Di alldatasheet   |   Richest di pubblicita   |   contatti   |   Privacy Policy   |   scambio Link   |   Ricerca produttore
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