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

X  

TPS62224DDCTG4 Fiches technique(PDF) 10 Page - Texas Instruments

No de pièce TPS62224DDCTG4
Description  400-mA, 1.25-MHz, HIGH-EFFICIENCY, STEP-DOWN CONVERTER IN THIN-SOT23
Download  24 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPS62224DDCTG4 Fiches technique(HTML) 10 Page - Texas Instruments

Back Button TPS62224DDCTG4 Datasheet HTML 6Page - Texas Instruments TPS62224DDCTG4 Datasheet HTML 7Page - Texas Instruments TPS62224DDCTG4 Datasheet HTML 8Page - Texas Instruments TPS62224DDCTG4 Datasheet HTML 9Page - Texas Instruments TPS62224DDCTG4 Datasheet HTML 10Page - Texas Instruments TPS62224DDCTG4 Datasheet HTML 11Page - Texas Instruments TPS62224DDCTG4 Datasheet HTML 12Page - Texas Instruments TPS62224DDCTG4 Datasheet HTML 13Page - Texas Instruments TPS62224DDCTG4 Datasheet HTML 14Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 24 page
background image
DETAILED DESCRIPTION
OPERATION
POWER-SAVE MODE OPERATION
I
skip v
66 mA )
Vin
160 W
I
peak +
66 mA )
Vin
80 W
TPS62220
,, TPS62221,, TPS62222
TPS62223, TPS62224, TPS62225
TPS62227, TPS62228, TPS62229
SLVS491E – SEPTEMBER 2003 – REVISED FEBRUARY 2009....................................................................................................................................... www.ti.com
The TPS6222x is a synchronous step-down converter operating with typically 1.25-MHz fixed frequency pulse
width modulation (PWM) at moderate to heavy load currents and in power-save mode operating with pulse
frequency modulation (PFM) at light load currents.
During PWM operation, the converter uses a unique fast response, voltage mode, controller scheme with input
voltage feed forward. This achieves good line and load regulation and allows the use of small ceramic input and
output capacitors. At the beginning of each clock cycle initiated by the clock signal (S), the P-channel MOSFET
switch is turned on, and the inductor current ramps up until the comparator trips and the control logic turns off the
switch. The current limit comparator also turns off the switch in case the current limit of the P-channel switch is
exceeded. Then, the N-channel rectifier switch is turned on and the inductor current ramps down. The next cycle
is initiated by the clock signal, again turning off the N-channel rectifier and turning on the P-channel switch.
The GM amplifier and input voltage determines the rise time of the sawtooth generator; therefore, any change in
input voltage or output voltage directly controls the duty cycle of the converter. This gives a very good line and
load transient regulation.
As the load current decreases, the converter enters the power-save mode operation. During power-save mode,
the converter operates with reduced switching frequency in PFM mode and with a minimum quiescent current to
maintain high efficiency. Two conditions allow the converter to enter the power-save mode operation. One is
when the converter detects discontinuous conduction mode. The other is when the peak switch current in the
P-channel switch goes below the skip current limit. The typical skip current limit can be calculated as:
During the power-save mode, the output voltage is monitored with the comparator (comp) by the thresholds
comp low and comp high. As the output voltage falls below the comp low threshold set to 0.8% typical above
Vout, the P-channel switch turns on. The P-channel switch is turned off as the peak switch current is reached.
The typical peak switch current can be calculated:
The N-channel rectifier is turned on and the inductor current ramps down. As the inductor current approaches
zero, the N-channel rectifier is turned off and the P-channel switch is turned on again, starting the next pulse.
The converter continues these pulses until the comp high threshold (set to typically 1.6% above Vout) is reached.
The converter enters a sleep mode, reducing the quiescent current to a minimum. The converter wakes up again
as the output voltage falls below the comp low threshold. This control method reduces the quiescent current
typically to 15
µA and reduces the switching frequency to a minimum, thereby achieving high converter efficiency
at light load. Setting the skip current thresholds to typically 0.8% and 1.6% above the nominal output voltage at
light load current results in a dynamic output voltage achieving lower absolute voltage drops during heavy load
transient changes. This allows the converter to operate with a small output capacitor of just 10
µF and still have a
low absolute voltage drop during heavy load transient changes. See Figure 14 for detailed operation of the
power-save mode.
10
Submit Documentation Feedback
Copyright © 2003–2009, Texas Instruments Incorporated
Product Folder Link(s): TPS62220 TPS62221 TPS62222 TPS62223 TPS62224 TPS62225 TPS62227 TPS62228
TPS62229


Numéro de pièce similaire - TPS62224DDCTG4

FabricantNo de pièceFiches techniqueDescription
logo
Texas Instruments
TPS62224DDCTG4 TI-TPS62224DDCTG4 Datasheet
745Kb / 24P
[Old version datasheet]   400-mA, 1.25-MHz, HIGH-EFFICIENCY, STEP-DOWN CONVERTER IN THIN-SOT23
More results

Description similaire - TPS62224DDCTG4

FabricantNo de pièceFiches techniqueDescription
logo
Texas Instruments
TPS62220 TI-TPS62220 Datasheet
464Kb / 20P
[Old version datasheet]   400-mA, 1.25-MHz, HIGH-EFFICIENCY, STEP-DOWN CONVERTER IN THIN-SOT23
TPS62220 TI-TPS62220_07 Datasheet
745Kb / 24P
[Old version datasheet]   400-mA, 1.25-MHz, HIGH-EFFICIENCY, STEP-DOWN CONVERTER IN THIN-SOT23
TPS62026 TI-TPS62026 Datasheet
612Kb / 24P
[Old version datasheet]   600 mA/1.25 MHz HIGH-EFFICIENCY STEP-DOWN CONVERTER
TPS62020 TI1-TPS62020_16 Datasheet
1Mb / 28P
[Old version datasheet]   600 mA/1.25 MHz HIGH-EFFICIENCY STEP-DOWN CONVERTER
TPS62020 TI-TPS62020_15 Datasheet
1Mb / 28P
[Old version datasheet]   600 mA/1.25 MHz HIGH-EFFICIENCY STEP-DOWN CONVERTER
TPS62020 TI-TPS62020 Datasheet
425Kb / 18P
[Old version datasheet]   600 mA/1.25 MHz HIGH-EFFICIENCY STEP-DOWN CONVERTER
TPS62040 TI1-TPS62040_12 Datasheet
944Kb / 30P
[Old version datasheet]   1.2 A/1.25 MHz, HIGH-EFFICIENCY STEP-DOWN CONVERTER
TPS62040 TI1-TPS62040_17 Datasheet
1Mb / 30P
[Old version datasheet]   1.2 A/1.25 MHz, HIGH-EFFICIENCY STEP-DOWN CONVERTER
TPS62040 TI-TPS62040_15 Datasheet
1Mb / 30P
[Old version datasheet]   1.2 A/1.25 MHz, HIGH-EFFICIENCY STEP-DOWN CONVERTER
TPS62040 TI-TPS62040 Datasheet
372Kb / 21P
[Old version datasheet]   1.2 A/1.25 MHZ, HIGH EFFICIENCY STEP DOWN CONVERTER
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


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