Moteur de recherche de fiches techniques de composants électroniques
  French  ▼
ALLDATASHEET.FR

X  

CS51414GDR8 Fiches technique(PDF) 11 Page - ON Semiconductor

No de pièce CS51414GDR8
Description  1.5 A, 260 kHz and 520 kHz, Low Voltage Buck Regulators with External Bias or Synchronization Capability
Download  20 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS51414GDR8 Fiches technique(HTML) 11 Page - ON Semiconductor

Back Button CS51414GDR8 Datasheet HTML 7Page - ON Semiconductor CS51414GDR8 Datasheet HTML 8Page - ON Semiconductor CS51414GDR8 Datasheet HTML 9Page - ON Semiconductor CS51414GDR8 Datasheet HTML 10Page - ON Semiconductor CS51414GDR8 Datasheet HTML 11Page - ON Semiconductor CS51414GDR8 Datasheet HTML 12Page - ON Semiconductor CS51414GDR8 Datasheet HTML 13Page - ON Semiconductor CS51414GDR8 Datasheet HTML 14Page - ON Semiconductor CS51414GDR8 Datasheet HTML 15Page - ON Semiconductor Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 20 page
background image
CS51411, CS51412, CS51413, CS51414
http://onsemi.com
11
The Soft−Start duration can be calculated by
TSS +
VC
CCOMP
ISOURCE
where:
VC = VC pin steady−state voltage, which is approximately
equal to error amplifier’s reference voltage.
CCOMP = Compensation capacitor connected to the VC pin
ISOURCE = Output Source Current of the error amplifier.
Using a 0.1
mF CCOMP, the calculation shows a TSS over
5.0 ms which is adequate to avoid any current stresses.
Figure 15 shows the gradual rise of the VC, VO and envelope
of the VSW during power up. There is no voltage overshoot
after the output voltage reaches the regulation. If the supply
voltage rises slower than the VC pin, output voltage may
overshoot.
Figure 15. The Power Up Transition of CS5141X
Regulator
Short Circuit
When the VFB pin voltage drops below Foldback
Threshold, the regulator reduces the peak current limit by
40% and switching frequency to 1/4 of the nominal
frequency. These features are designed to protect the IC and
external components during overload or short circuit
conditions. In those conditions, peak switching current is
clamped to the current limit threshold. The reduced
switching frequency significantly increases the ripple
current, and thus lowers the DC current. The short circuit can
cause the minimum duty cycle to be limited by Minimum
Output Pulse Width. The foldback frequency reduces the
minimum duty cycle by extending the switching cycle. This
protects the IC from overheating, and also limits the power
that can be transferred to the output. The current limit
foldback effectively reduces the current stress on the
inductor and diode. When the output is shorted, the DC
current of the inductor and diode can approach the current
limit threshold. Therefore, reducing the current limit by 40%
can result in an equal percentage drop of the inductor and
diode current. The short circuit waveforms are captured in
Figure 16, and the benefit of the foldback frequency and
current limit is self−evident.
Figure 16. In Short Circuit, the Foldback Current and
Foldback Frequency Limit the Switching Current to
Protect the IC, Inductor and Catch Diode
Thermal Considerations
A calculation of the power dissipation of the IC is always
necessary prior to the adoption of the regulator. The current
drawn by the IC includes quiescent current, predriver
current, and power switch base current. The quiescent
current drives the low power circuits in the IC, which
include comparators, error amplifier and other logic blocks.
Therefore, this current is independent of the switching
current and generates power equal to
WQ + VIN
IQ
where:
IQ = quiescent current.
The predriver current is used to turn on/off the power
switch and is approximately equal to 12 mA in worst case.
During steady state operation, the IC draws this current from
the Boost pin when the power switch is on and then receives
it from the VIN pin when the switch is off. The predriver
current always returns to the VSW pin. Since the predriver
current goes out to the regulator’s output even when the
power switch is turned off, a minimum load is required to
prevent overvoltage in light load conditions. If the Boost pin
voltage is equal to VIN + VO when the switch is on, the power
dissipation due to predriver current can be calculated by
WDRV + 12 mA
(VIN * VO )
VO2
VIN
)
The base current of a bipolar transistor is equal to collector
current divided by beta of the device. Beta of 60 is used here
to estimate the base current. The Boost pin provides the base
current when the transistor needs to be on.


Numéro de pièce similaire - CS51414GDR8

FabricantNo de pièceFiches techniqueDescription
logo
ON Semiconductor
CS51414GDR8 ONSEMI-CS51414GDR8 Datasheet
706Kb / 20P
   1.5 A, 260 kHz and 520 kHz, Low Voltage Buck Regulators with External Bias or Synchronization Capability
September, 2007 - Rev. 18
CS51414GDR8G ONSEMI-CS51414GDR8G Datasheet
706Kb / 20P
   1.5 A, 260 kHz and 520 kHz, Low Voltage Buck Regulators with External Bias or Synchronization Capability
September, 2007 - Rev. 18
CS51414GDR8G ONSEMI-CS51414GDR8G Datasheet
283Kb / 20P
   Low Voltage Buck Regulators
May, 2013 ??Rev. 21
More results

Description similaire - CS51414GDR8

FabricantNo de pièceFiches techniqueDescription
logo
ON Semiconductor
CS51411-D ONSEMI-CS51411-D Datasheet
706Kb / 20P
   1.5 A, 260 kHz and 520 kHz, Low Voltage Buck Regulators with External Bias or Synchronization Capability
September, 2007 - Rev. 18
CS51411 ONSEMI-CS51411_12 Datasheet
290Kb / 20P
   1.5 A, 260 kHz and 520 kHz Low Voltage Buck Regulators with External Bias or Synchronization Capability
November, 2012 ??Rev. 20
CS51411 ONSEMI-CS51411 Datasheet
489Kb / 16P
   1.5A, 260 kHz AND 520 kHz, LOW VOLTAGE BUCK REGULATORS WITH EXTERNAL BIAS OR SYNCHRONIZATION CAPABILITY
September, 2002 ??Rev. 11
NCV51411 ONSEMI-NCV51411 Datasheet
182Kb / 16P
   1.5 A, 260 kHz, Low Voltage Buck Regulator with Synchronization Capability
May, 2010 ??Rev. 15
NCV51411 ONSEMI-NCV51411 Datasheet
224Kb / 16P
   1.5 A, 260 kHz, Low Voltage Buck Regulator with Synchronization Capability
May, 2010 ??Rev. 15
NCV8842 ONSEMI-NCV8842_11 Datasheet
377Kb / 16P
   1.5 A, 170 kHz, Buck Regulator with Synchronization Capability
July, 2011 ??Rev. 10
NCV8842 ONSEMI-NCV8842 Datasheet
180Kb / 15P
   1.5 A, 170 kHz, Buck Regulator with Synchronization Capability
October, 2006 ??Rev. 1
NCV8843 ONSEMI-NCV8843 Datasheet
187Kb / 15P
   1.5 A, 340 kHz, Buck Regulator with Synchronization Capability
October, 2006 ??Rev. 1
NCP1546 ONSEMI-NCP1546 Datasheet
152Kb / 13P
   1.5 A, 170 kHz, Buck Regulator with Synchronization Capability
March, 2007 ??Rev. 0
NCV8843 ONSEMI-NCV8843_10 Datasheet
385Kb / 16P
   1.5 A, 340 kHz, Buck Regulator with Synchronization Capability
May, 2010 ??Rev. 10
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20


Fiches technique Télécharger

Go To PDF Page


Lien URL




Politique de confidentialité
ALLDATASHEET.FR
ALLDATASHEET vous a-t-il été utile ?  [ DONATE ] 

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Echange de liens   |   Fabricants
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