Datenblatt-Suchmaschine für elektronische Bauteile
  German  ▼
ALLDATASHEETDE.COM

X  

LM2578AN Datenblatt(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Teilenummer LM2578AN
Bauteilbeschribung  Switching Regulator
Download  18 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2578AN Datenblatt(HTML) 8 Page - National Semiconductor (TI)

Back Button LM2578AN Datasheet HTML 4Page - National Semiconductor (TI) LM2578AN Datasheet HTML 5Page - National Semiconductor (TI) LM2578AN Datasheet HTML 6Page - National Semiconductor (TI) LM2578AN Datasheet HTML 7Page - National Semiconductor (TI) LM2578AN Datasheet HTML 8Page - National Semiconductor (TI) LM2578AN Datasheet HTML 9Page - National Semiconductor (TI) LM2578AN Datasheet HTML 10Page - National Semiconductor (TI) LM2578AN Datasheet HTML 11Page - National Semiconductor (TI) LM2578AN Datasheet HTML 12Page - National Semiconductor (TI) Next Button
Zoom Inzoom in Zoom Outzoom out
 8 / 18 page
background image
Applications Information (Continued)
C.L. SENSE VOLTAGE MULTIPLICATION
When a larger sense resistor value is desired, the voltage di-
vider network, consisting of R1 and R2, may be used. This
effectively multiplies the sense voltage by (1 + R1/R2). Also,
R1 can be replaced by a diode to increase current limit
sense voltage to about 800 mV (diode V
f + 110 mV).
UNDER-VOLTAGE LOCKOUT
Under-voltage lockout is accomplished with few external
components. When V
in
becomes lower than the zener
breakdown voltage, the output transistor is turned off. This
occurs because diode D1 will then become forward biased,
allowing resistor R3 to sink a greater current from the
non-inverting input than is sunk by the parallel combination
of R1 and R2 at the inverting terminal. R3 should be one-fifth
of the value of R1 and R2 in parallel.
MAXIMUM DUTY CYCLE LIMITING
The maximum duty cycle can be externally limited by adjust-
ing the charge to discharge ratio of the oscillator capacitor
with a single external resistor. Typical values are 50 µA for
the charge current, 450 µA for the discharge current, and a
voltage swing from 200 mV to 750 mV. Therefore, R1 is se-
lected for the desired charging and discharging slopes and
C1 is readjusted to set the oscillator frequency.
DUTY CYCLE ADJUSTMENT
When manual or mechanical selection of the output transis-
tor’s duty cycle is needed, the cirucit shown below may be
used. The output will turn on with the beginning of each os-
cillator cycle and turn off when the current sunk by R2 and
R3 from the non-inverting terminal becomes greater than the
current sunk from the inverting terminal.
With the resistor values as shown, R3 can be used to adjust
the duty cycle from 0% to 90%.
When the sum of R2 and R3 is twice the value of R1, the
duty cycle will be about 50%. C1 may be a large electrolytic
capacitor to lower the oscillator frequency below 1 Hz.
DS008711-18
FIGURE 5. Current Limit Transient Suppressor,
V
in Referred
DS008711-19
FIGURE 6. Current Limit Sense Voltage Multiplication,
Ground Referred
DS008711-20
FIGURE 7. Current Limit Sense Voltage Multiplication,
V
in Referred
DS008711-22
FIGURE 8. Under-Voltage Lockout
DS008711-21
FIGURE 9. Maximum Duty Cycle Limiting
www.national.com
8


Ähnliche Teilenummer - LM2578AN

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
National Semiconductor ...
LM2578AN NSC-LM2578AN Datasheet
1Mb / 20P
   Switching Regulator
logo
Texas Instruments
LM2578AN TI-LM2578AN Datasheet
1Mb / 30P
[Old version datasheet]   LM2578A/LM3578A Switching Regulator
LM2578AN/NOPB TI1-LM2578AN/NOPB Datasheet
1Mb / 30P
[Old version datasheet]   Switching Regulator
More results

Ähnliche Beschreibung - LM2578AN

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Toshiba Semiconductor
TPC8012-H TOSHIBA-TPC8012-H_06 Datasheet
270Kb / 7P
   Switching Regulator Applications Switching Regulator Applications
logo
Texas Instruments
PT7778-3.3V TI1-PT7778-3.3V Datasheet
183Kb / 4P
[Old version datasheet]   Switching Regulator
logo
Sanyo Semicon Device
LA5757TP SANYO-LA5757TP Datasheet
78Kb / 6P
   Switching Regulator
logo
National Semiconductor ...
LM3578A NSC-LM3578A Datasheet
1Mb / 20P
   Switching Regulator
logo
Sanyo Semicon Device
LA5756 SANYO-LA5756 Datasheet
125Kb / 4P
   Switching Regulator
logo
ON Semiconductor
CS5111 ONSEMI-CS5111 Datasheet
112Kb / 16P
   Switching Regulator
January, 2001 ??Rev. 9
logo
National Semiconductor ...
LM2579 NSC-LM2579 Datasheet
540Kb / 13P
   SWITCHING REGULATOR
logo
Texas Instruments
LM2578A TI1-LM2578A Datasheet
1Mb / 30P
[Old version datasheet]   Switching Regulator
logo
ON Semiconductor
LA5774MC ONSEMI-LA5774MC Datasheet
313Kb / 6P
   Switching Regulator
May,2013
logo
XP Power Limited
STR XPPOWER-STR Datasheet
360Kb / 4P
   Switching Regulator
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18


Datenblatt Download

Go To PDF Page


Link URL




Privatsphäre und Datenschutz
ALLDATASHEETDE.COM
War ALLDATASHEET hilfreich?  [ DONATE ] 

Über Alldatasheet   |   Werbung   |   Kontakt   |   Privatsphäre und Datenschutz   |   Linktausch   |   Hersteller
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