Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

IRU3037 Datasheet(PDF) 5 Page - International Rectifier

Part # IRU3037
Description  8-PIN SYNCHRONOUS PWM CONTROLLER
Download  21 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IRU3037 Datasheet(HTML) 5 Page - International Rectifier

  IRU3037 Datasheet HTML 1Page - International Rectifier IRU3037 Datasheet HTML 2Page - International Rectifier IRU3037 Datasheet HTML 3Page - International Rectifier IRU3037 Datasheet HTML 4Page - International Rectifier IRU3037 Datasheet HTML 5Page - International Rectifier IRU3037 Datasheet HTML 6Page - International Rectifier IRU3037 Datasheet HTML 7Page - International Rectifier IRU3037 Datasheet HTML 8Page - International Rectifier IRU3037 Datasheet HTML 9Page - International Rectifier Next Button
Zoom Inzoom in Zoom Outzoom out
 5 / 21 page
background image
IRU3037 / IRU3037A
5
Rev. 2.8
03/10/03
www.irf.com
Figure 3 - Typical application of the IRU3037 for
programming the output voltage.
APPLICATION INFORMATION
Design Example:
The following example is a typical application for IRU3037,
the schematic is Figure 18 on page 14.
Output Voltage Programming
Output voltage is programmed by reference voltage and
external voltage divider. The Fb pin is the inverting input
of the error amplifier, which is internally referenced to
1.25V (0.8V for IRU3037A). The divider is ratioed to pro-
vide 1.25V at the Fb pin when the output is at its desired
value. The output voltage is defined by using the follow-
ing equation:
When an external resistor divider is connected to the
output as shown in Figure 3.
Equation (1) can be rewritten as:
Choose R5 = 1K
V
This will result to R6 = 1.65K
V
If the high value feedback resistors are used, the input
bias current of the Fb pin could cause a slight increase
in output voltage. The output voltage set point can be
more accurate by using precision resistor.
Soft-Start Programming
The soft-start timing can be programmed by selecting
the soft start capacitance value. The start up time of the
converter can be calculated by using:
Where:
CSS is the soft-start capacitor (
mF)
For a start-up time of 7.5ms, the soft-start capacitor will
be 0.1
mF. Choose a ceramic capacitor at 0.1mF.
Shutdown
The converter can be shutdown by pulling the soft-start
pin below 0.5V. The control MOSFET turns off and the
synchronous MOSFET turns on during shutdown.
Boost Supply Vc
To drive the high-side switch it is necessary to supply a
gate voltage at least 4V greater than the bus voltage.
This is achieved by using a charge pump configuration
as shown in Figure 18. The capacitor is charged up to
approximately twice the bus voltage. A capacitor in the
range of 0.1
mF to 1mF is generally adequate for most
applications. In application, when a separate voltage
source is available the boost circuit can be avoided as
shown in Figure 1.
Input Capacitor Selection
The input filter capacitor should be based on how much
ripple the supply can tolerate on the DC input line. The
larger capacitor, the less ripple expected but consider
should be taken for the higher surge current during the
power-up. The IRU3037 provides the soft-start function
which controls and limits the current surge. The value of
the input capacitor can be calculated by the following
formula:
Where:
CIN is the input capacitance (
mF)
IIN is the input current (A)
Dt is the turn on time of the high-side switch (ms)
DV is the allowable peak to peak voltage ripple (V)
Fb
IRU3037
VOUT
R5
R6
tSTART = 753Css (ms)
---(2)
VIN = 5V
VOUT = 3.3V
IOUT = 4A
DVOUT = 100mV
fS = 200KHz
R6 = R5
3
- 1
VOUT
VREF
(
)
VOUT = VREF
3
1 +
---(1)
R6
R5
(
)
CIN =
---(3)
IIN
3 Dt
DV


Similar Part No. - IRU3037

ManufacturerPart #DatasheetDescription
logo
International Rectifier
IRU3037 IRF-IRU3037 Datasheet
167Kb / 21P
   8-PIN SYNCHRONOUS PWM CONTROLLER
IRU3037A IRF-IRU3037A Datasheet
167Kb / 21P
   8-PIN SYNCHRONOUS PWM CONTROLLER
IRU3037ACF IRF-IRU3037ACF Datasheet
173Kb / 21P
   8-PIN SYNCHRONOUS PWM CONTROLLER
IRU3037ACF IRF-IRU3037ACF Datasheet
167Kb / 21P
   8-PIN SYNCHRONOUS PWM CONTROLLER
IRU3037ACFPBF IRF-IRU3037ACFPBF Datasheet
167Kb / 21P
   8-PIN SYNCHRONOUS PWM CONTROLLER
More results

Similar Description - IRU3037

ManufacturerPart #DatasheetDescription
logo
Advanced Power Electron...
APU3037 A-POWER-APU3037 Datasheet
199Kb / 18P
   8-PIN SYNCHRONOUS PWM CONTROLLER
logo
International Rectifier
IRU3037CSTR IRF-IRU3037CSTR Datasheet
167Kb / 21P
   8-PIN SYNCHRONOUS PWM CONTROLLER
IRU3137 IRF-IRU3137 Datasheet
169Kb / 19P
   8-PIN SYNCHRONOUS PWM CONTROLLER
logo
Advanced Power Electron...
APU3137 A-POWER-APU3137 Datasheet
184Kb / 17P
   8-PIN SYNCHRONOUS PWM CONTROLLER
logo
International Rectifier
IRU3037CSPBF IRF-IRU3037CSPBF Datasheet
173Kb / 21P
   8-PIN SYNCHRONOUS PWM CONTROLLER
logo
Anpec Electronics Corop...
APW7037 ANPEC-APW7037 Datasheet
123Kb / 11P
   8-PIN Synchronous Buck PWM Controller
logo
International Rectifier
IRU3072C IRF-IRU3072C Datasheet
332Kb / 24P
   20-PIN SYNCHRONOUS PWM CONTROLLER/ 3 LDO CONTROLLER
logo
Anpec Electronics Corop...
APW7120 ANPEC-APW7120 Datasheet
807Kb / 20P
   5V to 12V Supply Voltage, 8-PIN, Synchronous Buck PWM Controller
APW7120A ANPEC-APW7120A Datasheet
986Kb / 22P
   5V to 12V Supply Voltage, 8-PIN, Synchronous Buck PWM Controller
logo
UNISEM
US3034 UNISEM-US3034 Datasheet
74Kb / 9P
   8 PIN PWM SWITCHER CONTROLLER IC
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


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