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| 型号： | FLS2100XS |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC CTLR FPS HALF BRIDG LCC 9-SIP |
| 标准包装： | 19 |
| 系列： | FLS |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 通用 |
| 频率： | 94kHz ~ 106kHz |
| 安装类型： | 通孔 |
| 封装/外壳： | 9-SSIP |
| 供应商设备封装： | 9-SIP |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 130°C |
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
LVcc
time constant. The RC time constant is:
τ = R SS ? C SS
(4)
V AR
V CssH
V CssL
I Cr
t stop
t S/S
(a) Protections are triggered, (b) FLS-XS restarts
Figure 21. Self Auto-Restart Operation
5. Protection Circuits : The FLS-XS series has several
self-protective functions, such as Over-Current Protection
(OCP), Abnormal Over-Current Protection (AOCP), Over-
Figure 19. Frequency Sweeping of Soft-Start
4. Self Auto-Restart : The FLS-XS series can restart
automatically even when any built-in protections are
triggered with external supply voltage. As can be seen in
Figure 20 and Figure 21, once a protection is 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. The FLS-XS starts switching
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 10V or AR signal is HIGH, the protection is
reset. The FLS-XS resumes normal operation when LV CC
reaches the start voltage of 12.5V.
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 -0.58V, OCP is
triggered and the MOSFETs remain off. This protection
Figure 20. Internal Block of AR Pin
After protections trigger, FLS-XS is disabled during the
stop-time, t stop , where V Css decreases and reaches to
V CssL . The stop-time of FLS-XS can be estimated as:
has a shutdown time delay of 1.5μs to prevent
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
t STOP = C SS ? { ( R SS + R MIN ) || 5 k Ω }
The soft-start time t s/s can be set from Equation (4).
? 2010 Fairchild Semiconductor Corporation
FLS-XS Series ? Rev.1.0.0
(5)
10
without shutdown delay if the sensing pin voltage
drops below -0.9V.
www.fairchildsemi.com
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