Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

TPS54495PWP Datasheet(PDF) 8 Page - Texas Instruments

Click here to check the latest version.
Part # TPS54495PWP
Description  4A/2A Dual Channel Synchronous Step-Down Switcher with Integrated FET
Download  23 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS54495PWP Datasheet(HTML) 8 Page - Texas Instruments

Back Button TPS54495PWP Datasheet HTML 4Page - Texas Instruments TPS54495PWP Datasheet HTML 5Page - Texas Instruments TPS54495PWP Datasheet HTML 6Page - Texas Instruments TPS54495PWP Datasheet HTML 7Page - Texas Instruments TPS54495PWP Datasheet HTML 8Page - Texas Instruments TPS54495PWP Datasheet HTML 9Page - Texas Instruments TPS54495PWP Datasheet HTML 10Page - Texas Instruments TPS54495PWP Datasheet HTML 11Page - Texas Instruments TPS54495PWP Datasheet HTML 12Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 8 / 23 page
background image
TPS54495
SLVSBH0A – JUNE 2012 – REVISED MAY 2013
www.ti.com
Current Sensing and Over-Current Protection
The output over-current protection (OCP) is implemented using a cycle-by-cycle valley detection control circuit.
The switch current is monitored by measuring the low-side FET switch voltage between the SWx and PGNDx
pins. This voltage is proportional to the switch current and the on-resistance of the FET. To improve the
measurement accuracy, the voltage sensing is temperature compensated.
During the on-time of the high-side FET switch, the switch current increases at a linear rate determined by VINx,
VOx, the on-time and the output inductor value. During the on-time of the low-side FET switch, this current
decreases linearly. The average value of the switch current is the load current IOx. If the sensed voltage on the
low-side FET is above the voltage proportional to the current limit, the converter keeps the low-side switch on
until the measured voltage falls below the voltage corresponding to the current limit and a new switching cycle
begins. In subsequent switching cycles, the on-time is set to the value determined for CCM and the current is
monitored in the same manner.
Important considerations for this type of over-current protection: The load current is one half of the peak-to-peak
inductor current higher than the over-current threshold. Also when the current is being limited, the output voltage
tends to fall as the demanded load current may be higher than the current available from the converter. When
the over current condition is removed, the output voltage returns to the regulated value. This protection is non-
latching.
Undervoltage Protection and Hiccup Mode
Hiccup mode of operation protects the power supply from being damaged during an over-current fault condition.
If the OCL comparator circuit detects an over-current event the output voltage falls. When the feedback voltage
falls below 68% of the reference voltage, the UVP comparator output goes high and an internal UVP delay
counter begins counting. After counting UVP delay time, the TPS54495 shuts off the power supply for a given
time (7x UVP Enable Delay Time) and then tries to re-start the power supply. If the over-load condition has been
removed, the power supply starts and operates normally; otherwise, the TPS54495 detects another over-current
event and shuts off the power supply again, repeating the previous cycle. Excess heat due to overload lasts for
only a short duration in the hiccup cycle, therefore the junction temperature of the power device is much lower.
UVLO Protection
Under-voltage lock out protection (UVLO) monitors the voltage of the VREG5 pin. When the VREG5 voltage is lower
than the UVLO threshold, the TPS54495 shuts down. As soon as the voltage increases above the UVLO
threshold, the converter starts again.
Thermal Shutdown
TPS54495 monitors its temperature. If the temperature exceeds the threshold value (typically 155°C), the device
shuts down. When the temperature falls below the threshold, the IC starts again.
When VIN1 starts up and VREG5 output voltage is below its nominal value, the thermal shutdown threshold is
lower than 155°C. As long as VIN1 rises, TJ must be kept below 110°C.
8
Submit Documentation Feedback
Copyright © 2012–2013, Texas Instruments Incorporated
Product Folder Links: TPS54495


Similar Part No. - TPS54495PWP

ManufacturerPart #DatasheetDescription
logo
Texas Instruments
TPS54495PWP TI1-TPS54495PWP Datasheet
932Kb / 23P
[Old version datasheet]   4A/2A Dual Channel Synchronous Step-Down Switcher with Integrated FET
TPS54495PWPR TI1-TPS54495PWPR Datasheet
932Kb / 23P
[Old version datasheet]   4A/2A Dual Channel Synchronous Step-Down Switcher with Integrated FET
More results

Similar Description - TPS54495PWP

ManufacturerPart #DatasheetDescription
logo
Texas Instruments
TPS54494 TI-TPS54494_15 Datasheet
1Mb / 30P
[Old version datasheet]   4A/2A Dual Channel Synchronous Step-Down Switcher with Integrated FET
TPS54494 TI1-TPS54494_16 Datasheet
979Kb / 23P
[Old version datasheet]   4A/2A Dual Channel Synchronous Step-Down Switcher with Integrated FET
TPS54494 TI1-TPS54494 Datasheet
923Kb / 23P
[Old version datasheet]   4A/2A Dual Channel Synchronous Step-Down Switcher with Integrated FET
TPS54495 TI1-TPS54495 Datasheet
932Kb / 23P
[Old version datasheet]   4A/2A Dual Channel Synchronous Step-Down Switcher with Integrated FET
TPS54495 TI-TPS54495_15 Datasheet
1Mb / 30P
[Old version datasheet]   4A/2A Dual Channel Synchronous Step-Down Switcher with Integrated FET
TPS54294 TI1-TPS54294_16 Datasheet
1Mb / 30P
[Old version datasheet]   2A Dual Channel Synchronous Step-Down Switcher with Integrated FET
TPS54295 TI-TPS54295_15 Datasheet
1Mb / 30P
[Old version datasheet]   2A Dual Channel Synchronous Step-Down Switcher with Integrated FET
TPS54294 TI-TPS54294_15 Datasheet
1Mb / 30P
[Old version datasheet]   2A Dual Channel Synchronous Step-Down Switcher with Integrated FET
TPS542941 TI1-TPS542941_16 Datasheet
1Mb / 29P
[Old version datasheet]   2A/3A Dual Channel Synchronous Step-Down Switcher with Integrated FET
TPS542951 TI1-TPS542951_16 Datasheet
1Mb / 29P
[Old version datasheet]   2A/3A Dual Channel Synchronous Step-Down Switcher with Integrated FET
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


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
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