Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

MAX726ECK Datasheet(PDF) 10 Page - Maxim Integrated Products

Part # MAX726ECK
Description  5A/2A Step-Down, PWM, Switch-Mode DC-DC Regulators
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX726ECK Datasheet(HTML) 10 Page - Maxim Integrated Products

Back Button MAX726ECK Datasheet HTML 4Page - Maxim Integrated Products MAX726ECK Datasheet HTML 5Page - Maxim Integrated Products MAX726ECK Datasheet HTML 6Page - Maxim Integrated Products MAX726ECK Datasheet HTML 7Page - Maxim Integrated Products MAX726ECK Datasheet HTML 8Page - Maxim Integrated Products MAX726ECK Datasheet HTML 9Page - Maxim Integrated Products MAX726ECK Datasheet HTML 10Page - Maxim Integrated Products MAX726ECK Datasheet HTML 11Page - Maxim Integrated Products MAX726ECK Datasheet HTML 12Page - Maxim Integrated Products  
Zoom Inzoom in Zoom Outzoom out
 10 / 12 page
background image
5A/2A Step-Down, PWM,
Switch-Mode DC-DC Regulators
10
______________________________________________________________________________________
0.2
µs would be needed to provide a narrow enough
duty cycle that could control current when the output is
shorted. Since 0.6
µs is too long (at 100kHz), the f
OSC
is lowered to 20kHz once FB (and hence the output)
drops below about 1.3V (see Frequency vs. VFB Voltage
graph in the
Typical Operating Characteristics). This
way, the MAX724/MAX726's 0.6
µs minimum t
ON allows
a sufficiently small duty cycle (at the reduced fOSC) so
that current can still be limited.
Compensation Network
A series RC network connected from VC to ground
compensates the MAX724/MAX726. Compensation
RC values are shown in the applications circuits. RC
and CC shape error-amplifier gain as follows: At DC,
RC and CC have no effect, so the error-amplifier's
gain is the product of its transconductance (approxi-
mately 5000
µmhos) and an internal 400kΩ load
impedance (rINT) at VC. So at DC, AV(DC) = gM(rINT) =
approximately 2000
µmhos. R
C and CC then add a
low-frequency pole and a high-frequency zero, as
shown in Figure 5.
Output Overshoot
The MAX724/MAX726 error-amplifier design minimizes
overshoot, but precautions against overshoot should
still be exercised in sensitive applications. Worst-case
overshoot typically occurs when recovering from an
output short because VC slews down from its highest
voltage. This can be checked by simply shorting and
releasing the output.
Reduce objectional overshoot by increasing the com-
pensation resistor (to 3k
Ω or 4kΩ) at V
C.
This allows
the error-amplifier output, VC, to move more rapidly in
the negative direction. In some cases, loop stability
may suffer with a high-value compensation resistor. An
option, then, is to add output filter capacitance, which
reduces short-circuit recovery overshoot by limiting out-
put rise time. Lowering the compensation capacitor to
below 0.05
µF may also help by allowing V
C to slew fur-
ther before the output rises too far.
Optional Output Filters
Though not shown in the application circuits in Figures
2, 7, and 8, additional filtering can easily be added to
reduce output ripple to levels below 2%. It is more
effective to add an LC type filter rather than additional
output capacitance alone. A small-value inductor (2
µH
to 10
µH) and between 47µF and 220µF of filter capaci-
tance should suffice (Figure 6). Although the inductor
does not need to be of high quality (it is not switching),
it must still be rated for the full load current.
When an LC filter is added, do not move the connection
of the feedback resistor to the LC output. It should be left
connected to the main output filter capacitor (C1 in Figure
2). If the feedback connection is moved to the LC filter
point, the added phase shift may impact stability.
LF
CF
TO LOAD
FEEDBACK RESISTOR
MAIN FILTER CAP
Figure 6. Optional LC Output Filter
FREQUENCY
90° PHASE SHIFT
fPOLE = 1/[2π(400kΩ)]CC
-AV(MID) = gM / (2π f CC)
fZERO = 1 / (2π RC CC)
AV(HI) = gMRC
AV(DC) = gM(400kΩ) ≈ 2000
Figure 5. Error-Amplifier Gain as Set by RC and CC at VC Pin


Similar Part No. - MAX726ECK

ManufacturerPart #DatasheetDescription
logo
Maxim Integrated Produc...
MAX726 MAXIM-MAX726 Datasheet
39Kb / 4P
   5V/3.3V/3V 5A Step-Down, PWM, Switch-Mode DC-DC Regulators
Rev 3; 9/95
logo
Dallas Semiconductor
MAX726 DALLAS-MAX726 Datasheet
22Kb / 2P
   Switch-Mode Battery Charger Delivers 5A
More results

Similar Description - MAX726ECK

ManufacturerPart #DatasheetDescription
logo
Maxim Integrated Produc...
MXL1074 MAXIM-MXL1074 Datasheet
1Mb / 4P
   5A/2A Step-Down, PWM, Switch-Mode DC-DC Regulators
Rev 3; 9/95
logo
List of Unclassifed Man...
ZA3020 ETC-ZA3020 Datasheet
134Kb / 10P
   2A STEP DOWN PWM SWITCH MODE DC DC REGULATORS
logo
Maxim Integrated Produc...
MAX787 MAXIM-MAX787 Datasheet
39Kb / 4P
   5V/3.3V/3V 5A Step-Down, PWM, Switch-Mode DC-DC Regulators
Rev 3; 9/95
MAX727 MAXIM-MAX727 Datasheet
39Kb / 4P
   5V/3.3V/3V 2A Step-Down, PWM, Switch-Mode DC-DC Regulators
Rev 2; 9/95
logo
SHOUDING Shouding Semic...
SD6039A SHOUDING-SD6039A Datasheet
757Kb / 8P
   2A Step-Down PWM Switch -Mode DC/DC Regula tor
logo
Unisonic Technologies
P1696_1109 UTC-P1696_1109 Datasheet
223Kb / 7P
   200KHZ, 2A PWM STEP-DOWN DC/DC CONVERTER
logo
Shenzhen Huazhimei Semi...
HM1583A HMSEMI-HM1583A Datasheet
501Kb / 11P
   3.5A Step-Down PWM Switch-Mode DC/DC Converter
logo
ACE Technology Co., LTD...
ACE150X ACE-ACE150X Datasheet
714Kb / 13P
   150KHz,2A, PWM Step-Down DC/DC Converter
VER 1.2
logo
Unisonic Technologies
P1696 UTC-P1696_13 Datasheet
248Kb / 7P
   200KHZ, 2A PWM STEP-DOWN DC/DC CONVERTER
P1696 UTC-P1696_11 Datasheet
223Kb / 7P
   150KHZ, 2A PWM STEP-DOWN DC/DC CONVERTER
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