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| 型号： | FSFR2100XSL |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | IC FPS PWR SWITCH 400W 9-SIPL |
| 标准包装： | 19 |
| 系列： | FPS™ |
| 输出隔离： | 隔离 |
| 频率范围： | 94kHz ~ 106kHz |
| 输入电压： | 9.6 V ~ 25 V |
| 输出电压： | 500V |
| 功率（瓦特）： | 400W |
| 工作温度： | -40°C ~ 130°C |
| 封装/外壳： | 9-SIP 成形引线 |
| 供应商设备封装： | 9-SIP（L 形） |
| 包装： | 管件 |
It is typical to set the initial frequency of soft-start two to
(a )
(b )
( a)
(b ) (a )
(b )
three times the resonant frequency ( f O ) of the resonant
network. The soft-start time is three to four times the RC
L V CC
time constant. The RC time constant is:
? ? R SS ? C SS
(4)
V AR
V CssH
V CssL
I Cr
t stop
t S /S
(a ) P r o te ction s a r e tr igge r e d, ( b ) F S F R- U S r e sta r ts
Figure 21. Self Auto-Restart Operation
5. Protection Circuits : The FSFR-XS series has several
self-protective functions, such as Over-Current Protection
Figure 19. Frequency Sweeping of Soft-Start
4. Self Auto-Restart : The FSFR-XS series can restart
automatically even though any built-in protections are
triggered with external supply voltage. As can be seen in
Figure 20 and Figure 21, once any protections are
triggered, the M1 switch turns on and the V-I converter is
disabled. C SS starts to discharge until V Css across C SS
drops to V CssL . Then, all protections are reset, M1 turns
off, and the V-I converter resumes at the same time. The
(OCP), Abnormal Over-Current Protection (AOCP), Over-
Voltage Protection (OVP), and Thermal Shutdown (TSD).
These protections are auto-restart mode protections, as
shown in Figure 22.
Once a fault condition is detected, switching is terminated
and the MOSFETs remain off. When LV CC falls to the LV CC
stop voltage of 10 V or AR signal is HIGH, the protection is
reset. The FSFR-XS resumes normal operation when
LV CC reaches the start voltage of 12.5 V.
FSFR-XS starts switching again with soft-start. If the
protections occur while V Css is under V CssL and V CssH
level, the switching is terminated immediately, V Css
continues to increase until reaching V CssH , then C SS is
discharged by M1.
Figure 22. Protection Blocks
5.1 Over-Current Protection (OCP) : When the
sensing pin voltage drops below -0.58 V, OCP is
triggered and the MOSFETs remain off. This protection
has a shutdown time delay of 1.5 μs to prevent
Figure 20. Internal Block of AR Pin
After protections trigger, FSFR-XS is disabled during the
stop-time, t stop , where V Css decreases and reaches to
V CssL . The stop-time of FSFR-XS can be estimated as:
t STOP ? C SS ? ? ? R SS ? R MIN ? || 5 k ? ? (5)
The soft-start time, t s/s can be set as Equation (4).
? 2010 Fairchild Semiconductor Corporation
FSFR-XS Series ? Rev.1.0.2
10
premature shutdown during startup.
5.2 Abnormal Over-Current Protection (AOCP) : If
the secondary rectifier diodes are shorted, large
current with extremely high di/dt can flow through the
MOSFET before OCP is triggered. AOCP is triggered
without shutdown delay if the sensing pin voltage
drops below -0.9 V.
www.fairchildsemi.com
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