Datenblatt-Suchmaschine für elektronische Bauteile
  German  ▼
ALLDATASHEETDE.COM

X  

LM34927SD Datenblatt(PDF) 11 Page - Texas Instruments

Teilenummer LM34927SD
Bauteilbeschribung  LM34927 Integrated Secondary Side Bias Regulator for Isolated DC-DC Converters
Download  26 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM34927SD Datenblatt(HTML) 11 Page - Texas Instruments

Back Button LM34927SD Datasheet HTML 7Page - Texas Instruments LM34927SD Datasheet HTML 8Page - Texas Instruments LM34927SD Datasheet HTML 9Page - Texas Instruments LM34927SD Datasheet HTML 10Page - Texas Instruments LM34927SD Datasheet HTML 11Page - Texas Instruments LM34927SD Datasheet HTML 12Page - Texas Instruments LM34927SD Datasheet HTML 13Page - Texas Instruments LM34927SD Datasheet HTML 14Page - Texas Instruments LM34927SD Datasheet HTML 15Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 26 page
background image
+
VIN
UVLO
VIN
RUV1
CIN
RUV2
2
3
LM34927
LM34927
www.ti.com
SNVS799F – APRIL 2012 – REVISED DECEMBER 2013
Under Voltage Detector
The LM34927 contains a dual level Undervoltage Lockout (UVLO) circuit. When the UVLO pin voltage is below
0.66 V, the controller is in a low current shutdown mode. When the UVLO pin voltage is greater than 0.66 V but
less than 1.225 V, the controller is in standby mode. In standby mode the VCC bias regulator is active while the
regulator output is disabled. When the VCC pin exceeds the VCC undervoltage thresholds and the UVLO pin
voltage is greater than 1.225V, normal operation begins. An external set-point voltage divider from VIN to GND
can be used to set the minimum operating voltage of the regulator.
UVLO hysteresis is accomplished with an internal 20
μA current source that is switched on or off into the
impedance of the set-point divider. When the UVLO threshold is exceeded, the current source is activated to
quickly raise the voltage at the UVLO pin. The hysteresis is equal to the value of this current times the resistance
RUV2.
Table 2. Under Voltage Detector
UVLO
VCC
Mode
Description
<0.66 V
Shutdown
VCC regulator disabled.
Switcher disabled.
0.66 V-1.225 V
Standby
VCC regulator enabled.
Switcher disabled.
>1.225 V
VCC < 4.5 V
Standby
VCC regulator enabled.
Switcher disabled.
VCC > 4.5 V
Operating
VCC enabled.
Switcher enabled.
If the UVLO pin is wired directly to the VIN pin, the regulator will begin operation once the VCC undervoltage is
satisfied.
Figure 15. UVLO Resistor Setting
Thermal Protection
The LM34927 should be operated so the junction temperature does not exceed 150°C during normal operation.
An internal Thermal Shutdown circuit is provided to protect the LM34927 in the event of a higher than normal
junction temperature. When activated, typically at 165°C, the controller is forced into a low power reset state,
disabling the buck switch and the VCC regulator. This feature prevents catastrophic failures from accidental
device overheating. When the junction temperature reduces below 145°C (typical hysteresis = 20°C), the VCC
regulator is enabled, and normal operation is resumed.
Copyright © 2012–2013, Texas Instruments Incorporated
Submit Documentation Feedback
11
Product Folder Links: LM34927


Ähnliche Teilenummer - LM34927SD

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Texas Instruments
LM34927SD TI1-LM34927SD Datasheet
333Kb / 17P
[Old version datasheet]   Integrated Secondary Side Bias Regulator for Isolated DC-DC Converters
More results

Ähnliche Beschreibung - LM34927SD

HerstellerTeilenummerDatenblattBauteilbeschribung
logo
Texas Instruments
LM34927 TI-LM34927_15 Datasheet
2Mb / 28P
[Old version datasheet]   LM34927 Integrated Secondary-Side Bias Regulator for Isolated DC-DC Converters
LM34927 TI1-LM34927 Datasheet
333Kb / 17P
[Old version datasheet]   Integrated Secondary Side Bias Regulator for Isolated DC-DC Converters
LM34925 TI1-LM34925 Datasheet
1Mb / 27P
[Old version datasheet]   Integrated Secondary-Side Bias Regulator for Isolated DC-DC Converters
LM34925 TI1-LM34925_14 Datasheet
1Mb / 26P
[Old version datasheet]   Integrated Secondary Side Bias Regulator for Isolated DC-DC Converters
LM34926 TI1-LM34926 Datasheet
1Mb / 28P
[Old version datasheet]   LM34926 Integrated Secondary-Side Bias Regulator for Isolated DC-DC Converters
logo
Cherry Semiconductor Co...
CS5101 CHERRY-CS5101 Datasheet
153Kb / 7P
   Secondary Side Post Regulator for AC/DC and DC/DC Multiple Output Converters
logo
ON Semiconductor
CS5101 ONSEMI-CS5101 Datasheet
142Kb / 9P
   Secondary Side Post Regulator for AC/DC and DC/DC Multiple Output Converters
October, 2006 ??Rev. 6
logo
International Rectifier
IRFH4213PBF IRF-IRFH4213PBF Datasheet
356Kb / 8P
   Secondary Synchronous Rectifier MOSFET for isolated DC-DC converters
IRFH4234PBF IRF-IRFH4234PBF Datasheet
253Kb / 9P
   Secondary Synchronous Rectifier MOSFET for isolated DC-DC converters
IRFH4234PBF IRF-IRFH4234PBF_15 Datasheet
506Kb / 9P
   Secondary Synchronous Rectifier MOSFET for isolated DC-DC converters
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


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