Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

LM2576-3.3 Datasheet(PDF) 11 Page - Motorola, Inc

Part # LM2576-3.3
Description  Easy Switcher 3.0A Step-Down Voltage Regulator
Download  28 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

LM2576-3.3 Datasheet(HTML) 11 Page - Motorola, Inc

Back Button LM2576-3.3 Datasheet HTML 7Page - Motorola, Inc LM2576-3.3 Datasheet HTML 8Page - Motorola, Inc LM2576-3.3 Datasheet HTML 9Page - Motorola, Inc LM2576-3.3 Datasheet HTML 10Page - Motorola, Inc LM2576-3.3 Datasheet HTML 11Page - Motorola, Inc LM2576-3.3 Datasheet HTML 12Page - Motorola, Inc LM2576-3.3 Datasheet HTML 13Page - Motorola, Inc LM2576-3.3 Datasheet HTML 14Page - Motorola, Inc LM2576-3.3 Datasheet HTML 15Page - Motorola, Inc Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 28 page
background image
LM2576
11
MOTOROLA ANALOG IC DEVICE DATA
Procedure (Fixed Output Voltage Version) (continued)In order to simplify the switching regulator design, a step–by–step
design procedure and some examples are provided.
Procedure
Example
5. Output Capacitor Selection (Cout)
A. Since the LM2576 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
680
µF and 2000 µF 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 = 680 µF to 2000 µF standard aluminium electrolytic.
B. Capacitor voltage rating = 20 V.
Procedure (Adjustable Output Version: LM2576–ADJ)
Procedure
Example
Given Parameters:
Vout = Regulated Output Voltage
Vin(max) = Maximum DC Input Voltage
ILoad(max) = Maximum Load Current
Given Parameters:
Vout = 8.0 V
Vin(max) = 25 V
ILoad(max) = 2.5 A
1. Programming Output Voltage
To select the right programming resistor R1 and R2 value (see
Figure 2) use the following formula:
Resistor R1 can be between 1.0 k and 5.0 k
Ω. (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
where Vref = 1.23 V
1. Programming Output Voltage (selecting R1 and R2)
Select R1 and R2:
R2 = 9.91 k
Ω, choose a 9.88 k metal film resistor.
R2
+ R1
Vout
V
ref
* 1.0 + 1.8 k
8.0 V
1.23 V
* 1.0
Vout + 1.23 1.0 )
R2
R1
Select R1 = 1.8 k
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
“Application Hints” section of this data sheet.
2. Input Capacitor Selection (Cin)
A 100
µF, 150 V 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
LM2576 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 3.0 A current rating is adequate.
B. Use a 30 V 1N5821 Schottky diode or any
suggested fast recovery diode in the Table 1.


Similar Part No. - LM2576-3.3

ManufacturerPart #DatasheetDescription
logo
First Components Intern...
LM2576-3.3 FCI-LM2576-3.3 Datasheet
1,004Kb / 13P
   SMIPLE SWITCHER 3.0A Step-Down Voltage Regulator
logo
Micrel Semiconductor
LM2576-3.3BT MICREL-LM2576-3.3BT Datasheet
89Kb / 8P
   52kHz Simple 3A Buck Voltage Regulator
LM2576-3.3BT MICREL-LM2576-3.3BT Datasheet
64Kb / 9P
   52kHz Simple 3A Buck Regulator
LM2576-3.3BT MICREL-LM2576-3.3BT Datasheet
58Kb / 9P
   52kHz Simple 3A Buck Regulator
LM2576-3.3BT MICREL-LM2576-3.3BT Datasheet
64Kb / 9P
   52kHz Simple 3A Buck Regulator
More results

Similar Description - LM2576-3.3

ManufacturerPart #DatasheetDescription
logo
First Components Intern...
LM2576 FCI-LM2576 Datasheet
1,004Kb / 13P
   SMIPLE SWITCHER 3.0A Step-Down Voltage Regulator
logo
Texas Instruments
LMR10530 TI-LMR10530_15 Datasheet
1Mb / 31P
[Old version datasheet]   SIMPLE SWITCHER 5.5Vin, 3.0A Step-Down Voltage Regulator in WSON-10
logo
SeCoS Halbleitertechnol...
S5ELM2576 SECOS-S5ELM2576 Datasheet
967Kb / 8P
   Simple Switcher 3A Step-Down Voltage Regulator
logo
Cystech Electonics Corp...
PL2576-XXXF5 CYSTEKEC-PL2576-XXXF5 Datasheet
223Kb / 10P
   Simple Switcher 3A Step- Down Voltage Regulator
logo
National Semiconductor ...
LM1575 NSC-LM1575 Datasheet
725Kb / 27P
   SIMPLE SWITCHER 1A Step-Down Voltage Regulator
LM2574 NSC-LM2574 Datasheet
639Kb / 24P
   SIMPLE SWITCHER??0.5A Step-Down Voltage Regulator
LM2576 NSC-LM2576 Datasheet
639Kb / 24P
   SIMPLE SWITCHER 3A Step-Down Voltage Regulator
logo
List of Unclassifed Man...
AE2576 ETC-AE2576 Datasheet
569Kb / 11P
   SIMPLE SWITCHER 3A Step-Down Voltage Regulator
Jan.2010 V1.2
logo
National Semiconductor ...
LM2575EP NSC-LM2575EP Datasheet
1Mb / 26P
   SIMPLE SWITCHER 1A Step-Down Voltage Regulator
logo
Texas Instruments
LM2574 TI1-LM2574_16 Datasheet
3Mb / 38P
[Old version datasheet]   SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator
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 27 28


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.NET
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
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