Zakładka z wyszukiwarką danych komponentów
  Polish  ▼
ALLDATASHEET.PL

X  

LM3100 Arkusz danych(PDF) 11 Page - Texas Instruments

Numer części LM3100
Szczegółowy opis  SIMPLE SWITCHER짰 Synchronous 1MHz 1.5A Step-Down Voltage Regulator
Download  21 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

LM3100 Arkusz danych(HTML) 11 Page - Texas Instruments

Back Button LM3100_14 Datasheet HTML 7Page - Texas Instruments LM3100_14 Datasheet HTML 8Page - Texas Instruments LM3100_14 Datasheet HTML 9Page - Texas Instruments LM3100_14 Datasheet HTML 10Page - Texas Instruments LM3100_14 Datasheet HTML 11Page - Texas Instruments LM3100_14 Datasheet HTML 12Page - Texas Instruments LM3100_14 Datasheet HTML 13Page - Texas Instruments LM3100_14 Datasheet HTML 14Page - Texas Instruments LM3100_14 Datasheet HTML 15Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 21 page
background image
1.3 x 10
-10
200 ns x VIN(MAX)
RON t
RFB2
RFB1
0.8V
VOUT
=
-1
LM3100
STOP
RUN
VIN
VIN
SS
+
LM3100
www.ti.com
SNVS421F – JANUARY 2006 – REVISED DECEMBER 2009
Soft-Start
The soft-start feature allows the converter to gradually reach a steady state operating point, thereby reducing
start-up stresses and current surges. Upon turn-on, after VCC reaches the under-voltage threshold, an internal
8µA current source charges up the external capacitor at the SS pin. The ramping voltage at SS (and the non-
inverting input of the regulation comparator) ramps up the output voltage in a controlled manner.
An internal switch grounds the SS pin if any of the following cases happen: (i) VCC falls below the under-voltage
lock-out threshold; (ii) a thermal shutdown occurs; or (iii) the EN pin is grounded. Alternatively, the converter can
be disabled by connecting the SS pin to ground using an external switch. Releasing the switch allows the SS pin
return to pull high and the output voltage returns to normal. The shut-down configuration is shown in Figure 4 .
Figure 4. Alternate Shutdown Implementation
Thermal Protection
The LM3100 should be operated so the junction temperature does not exceed the maximum limit. An internal
Thermal Shutdown circuit, which activates (typically) at 165°C, takes the controller to a low power reset state by
disabling the buck switch and the on-timer, and grounding the SS pin. This feature helps prevent catastrophic
failures from accidental device overheating. When the junction temperature falls back below 145°C (typical
hysteresis = 20°C), the SS pin is released and normal operation resumes.
Applications Information
EXTERNAL COMPONENTS
The following guidelines can be used to select the external components.
RFB1 and RFB2 : The ratio of these resistors is calculated from:
(7)
RFB1 and RFB2 should be chosen from standard value resistors in the range of 1.0 kΩ - 10 kΩ which satisfy the
above ratio.
For VOUT = 0.8V, the FB pin can be connected to the output directly. However, the converter operation needs a
minimum inductor current ripple to maintain good regulation when no load is connected. This minimum load is
about 10 µA and can be implemented by adding a pre-load resistor to the output.
RON: The minimum value for RON is calculated from:
(8)
The equation 2 in Control Overview section can be used to select RON if a specific frequency is desired as long
as the above limitation is met.
L: The main parameter affected by the inductor is the output current ripple amplitude (IOR). The maximum
allowable (IOR must be determined at both the minimum and maximum nominal load currents. At minimum load
current, the lower peak must not reach 0A. At maximum load current, the upper peak must not exceed the
current limit threshold (1.9A). The allowable ripple current is calculated from the following equations:
Copyright © 2006–2009, Texas Instruments Incorporated
Submit Documentation Feedback
11
Product Folder Links: LM3100


Podobny numer części - LM3100_14

ProducentNumer częściArkusz danychSzczegółowy opis
logo
National Semiconductor ...
LM3100MH NSC-LM3100MH Datasheet
1Mb / 15P
   SIMPLE SWITCHER짰 Synchronous 1MHz 1.5A Step-Down Voltage Regulator
LM3100MH NSC-LM3100MH Datasheet
3Mb / 18P
   SIMPLE SWITCHER짰 Synchronous 1MHz 1.5A Step-Down Voltage Regulator
LM3100MHX NSC-LM3100MHX Datasheet
1Mb / 15P
   SIMPLE SWITCHER짰 Synchronous 1MHz 1.5A Step-Down Voltage Regulator
LM3100MHX NSC-LM3100MHX Datasheet
3Mb / 18P
   SIMPLE SWITCHER짰 Synchronous 1MHz 1.5A Step-Down Voltage Regulator
LM3100 NSC-LM3100_07 Datasheet
3Mb / 18P
   SIMPLE SWITCHER짰 Synchronous 1MHz 1.5A Step-Down Voltage Regulator
More results

Podobny opis - LM3100_14

ProducentNumer częściArkusz danychSzczegółowy opis
logo
National Semiconductor ...
LM3100 NSC-LM3100 Datasheet
1Mb / 15P
   SIMPLE SWITCHER짰 Synchronous 1MHz 1.5A Step-Down Voltage Regulator
LM3100 NSC-LM3100_07 Datasheet
3Mb / 18P
   SIMPLE SWITCHER짰 Synchronous 1MHz 1.5A Step-Down Voltage Regulator
logo
Texas Instruments
LM3103 TI1-LM3103_14 Datasheet
1Mb / 20P
[Old version datasheet]   SIMPLE SWITCHER짰 Synchronous 1MHz 0.75A Step-Down Voltage Regulator
logo
National Semiconductor ...
LM3102 NSC-LM3102 Datasheet
379Kb / 18P
   SIMPLE SWITCHER짰 Synchronous 1MHz 2.5A Step-Down Voltage Regulator
LM3103 NSC-LM3103 Datasheet
351Kb / 16P
   SIMPLE SWITCHER짰 Synchronous 1MHz 0.75A Step-Down Voltage Regulator
logo
Texas Instruments
LM25575 TI1-LM25575_14 Datasheet
989Kb / 29P
[Old version datasheet]   SIMPLE SWITCHER짰 42V, 1.5A Step-Down Switching Regulator
LM5575 TI1-LM5575_14 Datasheet
993Kb / 28P
[Old version datasheet]   SIMPLE SWITCHER짰 75V, 1.5A Step-Down Switching Regulator
LM3102 TI1-LM3102_14 Datasheet
1Mb / 24P
[Old version datasheet]   SIMPLE SWITCHER Synchronous 1MHz 2.5A Step-Down Voltage Regulator
LM3103 TI1-LM3103 Datasheet
1Mb / 20P
[Old version datasheet]   SIMPLE SWITCHER Synchronous 1MHz 0.75A Step-Down Voltage Regulator
logo
National Semiconductor ...
LM1575 NSC-LM1575_07 Datasheet
848Kb / 28P
   SIMPLE SWITCHER짰 1A 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


Arkusz danych Pobierz

Go To PDF Page


Link URL




Polityka prywatności
ALLDATASHEET.PL
Czy Alldatasheet okazała się pomocna?  [ DONATE ] 

O Alldatasheet   |   Reklama   |   Kontakt   |   Polityka prywatności   |   Linki   |   Lista producentów
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