www.fairchildsemi.com
AN-7730
FL7730 Design Tool Flow
Overview
This document is intended to provide in-depth guidance to using the Fairchild Design Tool for FL7 730. Use the Design Tool
with the product datasheet.
Figure 1. Design Flow
© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
Rev. 1.0.2 • 4/20/12
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Step 1 — Enter Input Output Specification
Step 2 — Transformer Design
Step 3 — Snubber Design
© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
Rev. 1.0.2 • 4/20/12 2
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Step 4 — Control Circuit Design
Step 5 — Power Device Design
© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
Rev. 1.0.2 • 4/20/12 3
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Step 6 — DIM Detection Circuit Design
Step 7 — Passive Bleeder Design
© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
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Step 8 — Active Damper Design
© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
Rev. 1.0.2 • 4/20/12 5
AN-7730 APPLICATION NOTE
Related Resources
Locate the Design Tool at:
http://www.fairchildsemi.com/design_tools/led-driver-design-tool/
Consult the product datasheet at:
FL7730 — Dimmable Single-Stage PFC PSR Offline LED Driver
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twitter.com/fairchildSemi
View product and company videos, listen to podcasts, and comment on our blog at:
www.fairchildsemi.com/engineeringconnections
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DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS
HEREIN TO IMPROVE RELIABILITY, FUNCTION, OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE
APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS
PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, or (c) whose failure to perform
when properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to
result in significant injury to the user.
© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
Rev. 1.0.2 • 4/20/12 6
2. A critical component is any component of a life support
device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
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