Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

SIC403DB Datasheet(PDF) 10 Page - Vishay Siliconix

Part # SIC403DB
Description  microBUCK SiC403 6 A, 28 V Integrated Buck Regulator with Programmable LDO
Download  25 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  VISHAY [Vishay Siliconix]
Direct Link  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

SIC403DB Datasheet(HTML) 10 Page - Vishay Siliconix

Back Button SIC403DB Datasheet HTML 6Page - Vishay Siliconix SIC403DB Datasheet HTML 7Page - Vishay Siliconix SIC403DB Datasheet HTML 8Page - Vishay Siliconix SIC403DB Datasheet HTML 9Page - Vishay Siliconix SIC403DB Datasheet HTML 10Page - Vishay Siliconix SIC403DB Datasheet HTML 11Page - Vishay Siliconix SIC403DB Datasheet HTML 12Page - Vishay Siliconix SIC403DB Datasheet HTML 13Page - Vishay Siliconix SIC403DB Datasheet HTML 14Page - Vishay Siliconix Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 25 page
background image
www.vishay.com
10
Document Number: 66550
S11-1638-Rev. B, 15-Aug-11
Vishay Siliconix
SiC403
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
APPLICATIONS INFORMATION
SiC403 Synchronous Buck Converter
The SiC403 is a step down synchronous buck DC/DC
converter with integrated power FETs and programmable
LDO. The SiC403 is capable of 6 A operation at very high
efficiency in a tiny 5 mm x 5 mm - 32 pin package. The
programmable operating frequency range of 200 kHz to
1 MHz, enables the user to optimize the solution for minimum
board space and optimum efficiency.
The
buck
controller
employs
pseudo-fixed
frequency
adaptive on-time control. This control scheme allows fast
transient response thereby lowering the size of the power
components used in the system.
Input Voltage Range
The SiC403 requires two input supplies for normal operation:
VIN and VDD. VIN operates over the wide range from 3 V to
28 V. VDD requires a 5 V supply input that can be an external
source or the internal LDO configured to supply 5 V.
Pseudo-Fixed Frequency Adaptive On-Time Control
The PWM control method used for the SiC403 is
pseudo-fixed frequency, adaptive on-time, as shown in
figure 1. The ripple voltage generated at the output capacitor
ESR is used as a PWM ramp signal. This ripple is used to
trigger the on-time of the controller.
The adaptive on-time is determined by an internal oneshot
timer. When the one-shot is triggered by the output ripple, the
device sends a single on-time pulse to the highside
MOSFET. The pulse period is determined by VOUT and VIN;
the period is proportional to output voltage and inversely
proportional to input voltage. With this adaptive on-time
arrangement, the device automatically anticipates the
on-time needed to regulate VOUT for the present VIN
condition and at the selected frequency.
The adaptive on-time control has significant advantages over
traditional control methods used in the controllers today.
• Reduced component count by eliminating DCR sense or
current sense resistor as no need of a sensing inductor
current.
• Reduced
saves
external
components
used
for
compensation by eliminating the no error amplifier and
other components.
• Ultra fast transient response because of fast loop,
absence of error amplifier speeds up the transient
response.
• Predictable frequency spread because of constant on-time
architecture.
• Fast transient response enables operation with minimum
output capacitance
Overall, superior performance compared to fixed frequency
architectures.
On-Time One-Shot Generator (tON) and Operating
Frequency
The SiC403 have an internal on-time one-shot generator
which is a comparator that has two inputs. The FB
Comparator output goes high when VFB is less than the
internal 750 mV reference. This feeds into the gate drive and
turns on the high-side MOSFET, and also starts the one-shot
timer. The one-shot timer uses an internal comparator and a
capacitor. One comparator input is connected to VOUT, the
other input is connected to the capacitor. When the on-time
begins, the internal capacitor charges from zero volts
through a current which is proportional to VIN. When the
capacitor voltage reaches VOUT, the on-time is completed
and the high-side MOSFET turns off. The figure 2 shows the
on-chip implementation of on-time generation.
This method automatically produces an on-time that is
proportional to VOUT and inversely proportional to VIN.
The SiC403 uses an external resistor to set the ontime which
indirectly
sets
the
frequency.
The
on-time
can
be
programmed to provide operating frequency from 200 kHz to
1 MHz using a resistor between the tON pin and ground. The
resistor value is selected by the following equation.
Figure 1 - Output Ripple and PWM Control Method
VIN
CIN
VLX
Q1
Q2
L
ESR
+
FB
VLX
tON
VFB
COUT
VOUT
FB threshold
Figure 2 - On-Time Generation
FB
750 mV
-
+
VOUT
VIN
Rton
On-time = K x Rton x (VOUT/VIN)
FB comparator
One-shot
timer
Gate
drives
DH
DL
Q1
Q2
L
Q1
ESR
FB
VOUT
COUT
VLX
+
Rton =
(tON - 10 ns) x VIN
25 pF x VOUT


Similar Part No. - SIC403DB

ManufacturerPart #DatasheetDescription
logo
Vishay Siliconix
SIC403DB VISHAY-SIC403DB Datasheet
648Kb / 26P
   microBUCK SiC403 6 A, 28 V Integrated Buck Regulator with Programmable LDO
Rev. C, 19-Mar-12
SiC403DB VISHAY-SiC403DB Datasheet
1Mb / 24P
   6 A microBUCK® SiC403A/B Integrated Buck Regulator with Programmable LDO
Rev. A, 27-Aug-12
SIC403DB VISHAY-SIC403DB Datasheet
1Mb / 25P
   6 A microBUCK SiC403A/B Integrated Buck Regulator with Programmable LDO
Rev. A, 27-Aug-12
SIC403DB VISHAY-SIC403DB Datasheet
1Mb / 27P
   6 A microBUCK짰 SiC403A/B Integrated Buck Regulator with Programmable LDO
01-Jan-2022
SIC403DB VISHAY-SIC403DB Datasheet
624Kb / 26P
   microBUCK짰 SiC403 6 A, 28 V Integrated Buck Regulator with Programmable LDO
01-Jan-2019
More results

Similar Description - SIC403DB

ManufacturerPart #DatasheetDescription
logo
Vishay Siliconix
SIC403 VISHAY-SIC403_12 Datasheet
648Kb / 26P
   microBUCK SiC403 6 A, 28 V Integrated Buck Regulator with Programmable LDO
Rev. C, 19-Mar-12
SIC403 VISHAY-SIC403_V01 Datasheet
624Kb / 26P
   microBUCK짰 SiC403 6 A, 28 V Integrated Buck Regulator with Programmable LDO
01-Jan-2019
SIC417 VISHAY-SIC417 Datasheet
932Kb / 21P
   microBUCK SiC417 10-A, 28-V Integrated Buck Regulator with Programmable LDO
Rev. D, 14-Jun-10
SIC414 VISHAY-SIC414 Datasheet
1Mb / 24P
   microBUCK SiC414 6 A, 28 V Integrated Buck Regulator with 5 V LDO
Rev. B, 04-Feb-13
SIC403A VISHAY-SIC403A_13 Datasheet
1Mb / 25P
   6 A microBUCK SiC403A/B Integrated Buck Regulator with Programmable LDO
Rev. A, 27-Aug-12
SIC403A VISHAY-SIC403A Datasheet
1Mb / 24P
   6 A microBUCK® SiC403A/B Integrated Buck Regulator with Programmable LDO
Rev. A, 27-Aug-12
SIC414 VISHAY-SIC414 Datasheet
1Mb / 24P
   6 A, microBUCK SiC414, SiC424 Integrated Buck Regulator with 5 V LDO
Rev. B, 04-Feb-13
SIC401A VISHAY-SIC401A Datasheet
1Mb / 28P
   15 A microBUCK SiC401A/B Integrated Buck Regulator with Programmable LDO
Rev. C, 03-Sep-12
SIC402A VISHAY-SIC402A Datasheet
1Mb / 26P
   10 A microBUCK SiC402A/B Integrated Buck Regulator with Programmable LDO
Rev. B, 03-Sep-12
SIC417 VISHAY-SIC417_13 Datasheet
928Kb / 21P
   10-A, 28-V Integrated Buck Regulator with Programmable LDO
Rev. D, 14-Jun-10
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 25


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