Fairchild FSB127H User Manual
User Guide for
FEBFSB127H_T001
Evaluation Board
FSB127H 100kHz Power Switch for
ATX Standby 16W
Featured Fairchild Product:
FSB127H
Direct questions or comments
about this Evaluation Board to:
“Worldwide Direct Support”
Fairchild Semiconductor.com
© 2011 Fairchild Semiconductor Corporation 1 FEBFSB127H_T001 • Rev. 1.0.0
Table of Contents
1. Overview ................................................................................................................................... 3
2. Board Configuration ................................................................................................................. 3
3. Schematic .................................................................................................................................. 4
4. PCB Layout ............................................................................................................................... 5
5. Test Results ............................................................................................................................... 6
5.1. Brown-in / Brownout ...................................................................................................... 6
5.2. AC Trim Up and Trim Down ......................................................................................... 6
5.3. Line and Load Regulation .............................................................................................. 6
5.4. DC Output Rise Time ..................................................................................................... 7
5.5. DC Transient Response .................................................................................................. 8
5.6. Ripple and Noise ............................................................................................................ 8
5.7. Capacitive Load .............................................................................................................. 9
5.8. Power Saving ................................................................................................................ 10
5.9. Efficiency ..................................................................................................................... 10
5.10. Short-Circuit Protection ............................................................................................... 11
5.11. X-Cap Discharge .......................................................................................................... 11
5.12. Over-Power Protection ................................................................................................. 12
5.13. Surge and ESD ............................................................................................................. 12
5.14. EMI Conduction ........................................................................................................... 12
6. Bill of Materials ...................................................................................................................... 13
7. Transformer ............................................................................................................................. 14
7.1. Transformer Specification .............................................................................................. 14
8. Revision History ..................................................................................................................... 15
© 2011 Fairchild Semiconductor Corporation 2 FEBFSB127H_T001 • Rev. 1.0.0
This user guide supports the 16W evaluation board for ATX standby using FSB127H. It
should be used in conjunction with the FSB127H datasheet as well as Fairchild’s
application notes and technical support team. Please visit Fairchild’s website at
www.fairchildsemi.com
1. Overview
The highly integrated FSB-series consists of an integrated Current Mode Pulse Width
Modulator (PWM) and an avalanche-rugged 700V SenseFET. It is specifically designed
for high-performance offline Switch Mode Power Supplies (SMPS) with minimal
external components.
Compared with a discrete MOSFET and controller or RCC switching converter solution,
the FSB-series reduces total component count, design size, and weight while increasing
efficiency, productivity, and system reliability. These devices provide a basic platform
for the design of cost-effective flyback converters, as in PC auxiliary power supplies.
.
Figure 1. Photo of FEBFSB127H_T001
2. Board Configuration
Input Voltage: 90V
Output Voltage: 5V
Output Current: 0 – 3.2A
Operation Frequency: 100kHz
© 2011 Fairchild Semiconductor Corporation 3 FEBFSB127H_T001 • Rev. 1.0.0
– 264VAC
AC
3. Schematic
Figure 2. Evaluation Board Schematic
© 2011 Fairchild Semiconductor Corporation 4 FEBFSB127H_T001 • Rev. 1.0.0
4. PCB Layout
Figure 3. Evaluation Board PCB Layout
© 2011 Fairchild Semiconductor Corporation 5 FEBFSB127H_T001 • Rev. 1.0.0
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