Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

XRP6124ESTR0.5-F Datasheet(PDF) 7 Page - Exar Corporation

Part # XRP6124ESTR0.5-F
Description  Non-Synchronous PFET Step-Down Controller
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRP6124ESTR0.5-F Datasheet(HTML) 7 Page - Exar Corporation

Back Button XRP6124ESTR0.5-F Datasheet HTML 3Page - Exar Corporation XRP6124ESTR0.5-F Datasheet HTML 4Page - Exar Corporation XRP6124ESTR0.5-F Datasheet HTML 5Page - Exar Corporation XRP6124ESTR0.5-F Datasheet HTML 6Page - Exar Corporation XRP6124ESTR0.5-F Datasheet HTML 7Page - Exar Corporation XRP6124ESTR0.5-F Datasheet HTML 8Page - Exar Corporation XRP6124ESTR0.5-F Datasheet HTML 9Page - Exar Corporation XRP6124ESTR0.5-F Datasheet HTML 10Page - Exar Corporation XRP6124ESTR0.5-F Datasheet HTML 11Page - Exar Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 12 page
background image
X
XR
RP
P6
61
12
24
4
N
No
on
n--S
Sy
yn
nc
ch
hrro
on
no
ou
us
s P
PF
FE
ET
T S
Stte
ep
p--D
Do
ow
wn
n C
Co
on
nttrro
olllle
err
© 2011 Exar Corporation
7/12
Rev. 1.1.0
THEORY OF OPERATION
THEORY OF OPERATION
The XRP6124 utilizes a proprietary Constant
On-Time (COT) control with emulated ESR.
The on-time is internally set and automatically
adjusts during operation, inversely with the
voltage VIN, in order to maintain a constant
frequency. Therefore the switching frequency
is independent of the inductor and capacitor
size,
unlike
hysteretic
controllers.
The
emulated ESR ramp allows the use of ceramic
capacitors for output filtering.
At the beginning of each cycle, the XRP6124
turns on the P-Channel FET for a fixed
duration. The on-time is internally set and
adjusted by VIN. At the end of the on-time the
FET is turned off, for a predetermined
minimum off time TOFF-MIN (nominally 250ns).
After the TOFF-MIN has expired the voltage at
feedback pin FB is compared to a voltage
ramp at the feedback comparators positive
input. Once VFB drops below the ramp voltage,
the FET is turned on and a new cycle starts.
This voltage ramp constitutes an emulated
ESR and makes possible the use of ceramic
capacitors, in addition to other capacitors, as
output filter for the buck converter.
VOLTAGE OPTIONS
The XRP6124 is available in two voltage
options as shown in table 1. The low-voltage
and high-voltage options have TON of 0.5µs at
12VIN and 24VIN respectively. Note that TON is
inversely proportional to VIN. The constant of
proportionality K, for each voltage option is
shown in table 1. Variation of TON versus VIN is
shown graphically in figures 6 and 7.
Voltage
rating (V)
Part Number
TON (µs)
K=TONxVIN
(μs.V)
3-18
XRP6124ES0.5-F
0.5 @ 12VIN
6
4.5-30
XRP6124HVES0.5-F 0.5 @ 24VIN
12
Table 1 : XRP6124 voltage options
For a buck converter the switching frequency
fs can be expressed in terms of VIN, VOUT and
TON as follows:
ON
IN
OUT
T
V
V
fs
×
=
Since for each voltage option, the product of
VIN and TON is the constant K shown in table 1,
then switching frequency is determined by
VOUT as shown in table 2.
VOUT
Switching frequency fs(kHz)
XRP6124ES0.5-F
XRP6124HVES0.5-F
1.2
200
100
1.5
250
125
1.8
300
150
2.5
417
208
3.3
550
275
5.0
833
417
12
---
1000
Table 2: Switching frequency fs
for the XRP6124 voltage options
Where it is advantageous, the high-voltage
option
may
be
used
for
low-voltage
applications. For example a 12VIN to 5VOUT
conversion using a low-voltage option will
result in switching frequency of 833kHz as
shown in table 2. If it is desired to increase
the converter efficiency, then switching losses
can be reduced in half by using a high-voltage
option operating at a switching frequency of
417kHz.
VOUT
Maximum Output Current IOUT(A)
XRP6124ES0.5-F
XRP6124HVES0.5-F
3.3VIN
5.0VIN
12VIN
18VIN
24VIN
1.2
5
5
4
---
---
1.5
5
5
4
4
---
1.8
5
5
4
4
4
2.5
4
4
4
4
4
3.3
---
4
3
4
4
5.0
---
---
3
3
3
12
---
---
---
2
2
Table 3: Maximum recommended IOUT
SHORT
-CIRCUIT PROTECTION
The purpose of this feature is to prevent an
accidental short-circuit at the output from
damaging the converter. The XRP6124 has a
short-circuit
comparator
that
constantly
monitors the feedback node, after soft-start is


Similar Part No. - XRP6124ESTR0.5-F

ManufacturerPart #DatasheetDescription
logo
Exar Corporation
XRP6141 EXAR-XRP6141 Datasheet
1Mb / 14P
   35A Synchronous Step Down COT Controller
XRP6141EL-F EXAR-XRP6141EL-F Datasheet
1Mb / 14P
   35A Synchronous Step Down COT Controller
XRP6141EL-F EXAR-XRP6141EL-F Datasheet
1Mb / 14P
   35A Synchronous Step Down COT Controller
XRP6141ELMTR-F EXAR-XRP6141ELMTR-F Datasheet
1Mb / 14P
   35A Synchronous Step Down COT Controller
XRP6141ELMTR-F EXAR-XRP6141ELMTR-F Datasheet
1Mb / 14P
   35A Synchronous Step Down COT Controller
More results

Similar Description - XRP6124ESTR0.5-F

ManufacturerPart #DatasheetDescription
logo
National Semiconductor ...
LM2688 NSC-LM2688 Datasheet
147Kb / 8P
   Non-synchronous Step-down Controller for Pentium Microprocessors
logo
Vishay Siliconix
SIP12202 VISHAY-SIP12202 Datasheet
768Kb / 10P
   Synchronous Step Down Controller
Rev. A, 10-Oct-05
SIP12201 VISHAY-SIP12201 Datasheet
865Kb / 11P
   Synchronous Step Down Controller
Rev. A, 10-Oct-05
logo
ON Semiconductor
NCP5212A ONSEMI-NCP5212A Datasheet
336Kb / 19P
   Single Synchronous Step-Down Controller
May, 2009 ??Rev. 0
logo
Intersil Corporation
ISL8117 INTERSIL-ISL8117 Datasheet
918Kb / 23P
   Synchronous Step-down PWM Controller
June 4, 2015
logo
Texas Instruments
TPS53114PWR TI-TPS53114PWR Datasheet
954Kb / 27P
[Old version datasheet]   SINGLE SYNCHRONOUS STEP-DOWN CONTROLLER
logo
ON Semiconductor
NCP81045 ONSEMI-NCP81045 Datasheet
302Kb / 17P
   Single Synchronous Step-Down Controller
October, 2012 ??Rev. P0
NCP5217A ONSEMI-NCP5217A_11 Datasheet
279Kb / 16P
   Single Synchronous Step-Down Controller
May, 2011 ??Rev. 2
logo
Renesas Technology Corp
ISL8117 RENESAS-ISL8117 Datasheet
1Mb / 24P
   Synchronous Step-Down PWM Controller
logo
Texas Instruments
TPS51117 TI-TPS51117 Datasheet
1Mb / 22P
[Old version datasheet]   SINGLE SYNCHRONOUS STEP-DOWN CONTROLLER
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


Datasheet Download

Go To PDF Page


Link URL




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

About Alldatasheet   |   Advertisement   |   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