1 colspan=2>
SWITCHMODE SMPSRM/D
Rev. 2, Apr-2000
ON Semiconductor
ON Semiconductor
SWITCHMODE P
ower Supply R
ef Manual
SWITCHMODE Power
Supply Reference Manual
04/00
SMPSRM
REV 2
ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further
notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any par ticular purpose, nor does
SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation
special, consequential or incidental damages. Typical parameters which may be provided in SCILLC data sheets and/or specifications can and do var y in different
applications and actual per formance may var y over time. All operating parameters, including Typicals must be validated for each customer application by
customers technical exper ts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or
authorized for use as components in systems intended for surgical implant into the body, or other applications intended to suppor t or sustain life, or for any other
application in which the failure of the SCILLC product could create a situation where personal injur y or death may occur. Should Buyer purchase or use SCILLC
products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and
distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal
injur y or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of
the par t. SCILLC is an Equal Oppor tunity/Affirmative Action Employer.
NORTH AMERICA Literature Fulfillment:
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada
Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada
Email: ONlit
@
hibber tco.com
Fax Response Line: 303-675-2167 or 800-344-3810 Toll Free USA/Canada
N. American Technical Support: 800-282-9855 Toll Free USA/Canada
EUROPE: LDC for ON Semiconductor - European Suppor t
German Phone: (+1) 303-308-7140 (M-F 1:00pm to 5:00pm Munich Time)
Email: ONlit-german
@
hibber tco.com
French Phone: (+1) 303-308-7141 (M-F 1:00pm to 5:00pm Toulouse Time)
Email: ONlit-french
@
hibber tco.com
English Phone: (+1) 303-308-7142 (M-F 12:00pm to 5:00pm UK Time)
Email: ONlit
@
hibber tco.com
EUROPEAN TOLL-FREE ACCESS*: 00-800-4422-3781
*Available from Germany, France, Italy, England, Ireland
CENTRAL/SOUTH AMERICA:
Spanish Phone: 303-308-7143 (Mon-Fri 8:00am to 5:00pm MST)
Email: ONlit-spanish
@
hibber tco.com
ASIA/PACIFIC: LDC for ON Semiconductor - Asia Suppor t
Phone: 303-675-2121 (T-F 9:00am to 1:00pm Hong Kong Time)
Toll Free from Hong Kong & Singapore:
001-800-4422-3781
Email: ONlit-asia
@
hibber tco.com
JAPAN: ON Semiconductor, Japan Customer Focus Center
4-32-1 Nishi-Gotanda, Shinagawa-ku, Tokyo, Japan 141-8549
Phone: 81-3-5740-2745
Email: r14525@onsemi.com
ON Semiconductor Website: http://onsemi.com
PUBLICATION ORDERING INFORMATION
For additional information, please contact your local Sales
Representative
SMPSRM/D SWITCHMODE
t
Power Supplies
Reference Manual and Design Guide
SMPSRM/D
Rev. 2, Apr2000
©
SCILLC, 2000
Previous Edition
©
1999
All Rights Reserved SMPSRM
ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes
without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular
purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability,
including without limitation special, consequential or incidental damages. Typical parameters which may be provided in SCILLC data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including Typicals must be
validated for each customer application by customers technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.
SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or
death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold
SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable
attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim
alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer.
PUBLICATION ORDERING INFORMATION
CENTRAL/SOUTH AMERICA:
Spanish Phone: 3033087143 (MonFri 8:00am to 5:00pm MST)
Email: ONlitspanish@hibbertco.com
ASIA/PACIFIC: LDC for ON Semiconductor Asia Support
Phone: 3036752121 (TueFri 9:00am to 1:00pm, Hong Kong Time)
Toll Free from Hong Kong & Singapore:
00180044223781
Email: ONlitasia@hibbertco.com
JAPAN: ON Semiconductor, Japan Customer Focus Center
4321 NishiGotanda, Shinagawaku, Tokyo, Japan 1418549
Phone: 81357402745
Email: r14525@onsemi.com
ON Semiconductor Website: http://onsemi.com
For additional information, please contact your local
Sales Representative.
NORTH AMERICA Literature Fulfillment:
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 3036752175 or 8003443860 Toll Free USA/Canada
Fax: 3036752176 or 8003443867 Toll Free USA/Canada
Email: ONlit@hibbertco.com
Fax Response Line: 3036752167 or 8003443810 Toll Free USA/Canada
N. American Technical Support: 8002829855 Toll Free USA/Canada
EUROPE: LDC for ON Semiconductor European Support
German Phone: (+1) 3033087140 (MF 1:00pm to 5:00pm Munich Time)
Email: ONlitgerman@hibbertco.com
French Phone: (+1) 3033087141 (MF 1:00pm to 5:00pm Toulouse Time)
Email: ONlitfrench@hibbertco.com
English Phone: (+1) 3033087142 (MF 12:00pm to 5:00pm UK Time)
Email: ONlit@hibbertco.com
EUROPEAN TOLLFREE ACCESS*: 0080044223781
*Available from Germany, France, Italy, England, Ireland SMPSRM
http://onsemi.com
3
Forward
Every new electronic product, except those that are battery powered, requires converting offline
115 Vac or 230 Vac power to some dc voltage for powering the electronics. The availability of design
and application information and highly integrated semiconductor control ICs for switching power
supplies allows the designer to complete this portion of the system design quickly and easily.
Whether you are an experienced power supply designer, designing your first switching power
supply or responsible for a make or buy decision for power supplies, the variety of information
in the SWITCHMODE Power Supplies Reference Manual and Design Guide should prove
useful.
ON Semiconductor has been a key supplier of semiconductor products for switching power supplies
since we introduced bipolar power transistors and rectifiers designed specifically for switching
power supplies in the mid70s. We identified these as SWITCHMODE products. A switching
power supply designed using ON Semiconductor components can rightfully be called a
SWITCHMODE power supply or SMPS.
This brochure contains useful background information on switching power supplies for those who
want to have more meaningful discussions and are not necessarily experts on power supplies. It also
provides real SMPS examples, and identifies several application notes and additional design
resources available from ON Semiconductor, as well as helpful books available from various
publishers and useful web sites for those who are experts and want to increase their expertise. An
extensive list and brief description of analog ICs, power transistors, rectifiers and other discrete
components available from ON Semiconductor for designing a SMPS are also provided. This
includes our newest GreenLine , Easy Switcher and very high voltage ICs (VHVICs), as well as
high efficiency HDTMOS
®
and HVTMOS
®
power FETs, and a wide choice of discrete products
in surface mount packages.
For the latest updates and additional information on analog and discrete products for power supply and
power management applications, please visit our website: (http://onsemi.com).
MEGAHERTZ, POWERTAP, SENSEFET, SWITCHMODE, and TMOS are trademarks of Semiconductor Components Industries,
LLC. HDTMOS and HVTMOS are registered trademarks of Semiconductor Components Industries, LLC.
GreenLine, SMARTMOS and Motorola are trademarks of Motorola Inc. SMPSRM
http://onsemi.com
4
Table of Contents
Page
What Everyone Should Know About Switching Power Supplies by Marty Brown
5
. . . . . . . . . . . . .