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参数资料
| 型号： | FSFR1800US |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | IC FPS POWER SWITCH 9-SIP |
| 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）： | 260W |
| 工作温度： | -40°C ~ 130°C |
| 封装/外壳： | 9-SIP |
| 供应商设备封装： | 9-SIP |
| 包装： | 管件 |
It is typical to set the initial frequency of soft-start two to
three times the resonant frequency ( f O ) of the resonant
network.
The soft-start time is three to four times of the RC time
For the soft-start time, t s/s it can be set as Equation (4).
(a ) (b ) ( a) (b ) (a ) (b )
L V CC
constant. The RC time constant is as follows:
τ = R SS ? C SS
(4)
V AR
V C ssH
V C ssL
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-US 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 FSFR-US 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, M1 switch turns on and V-I converter is
disabled. C SS starts to be discharged until V Css across
C SS drops to V CssL . Then, all protections are reset, M1
turns off, and V-I converter resumes at the same time.
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 FSFR-US resumes normal operation when
LV CC reaches the start voltage of 12.5V.
The FSFR-US 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 -0.58V, OCP is
triggered and the MOSFETs remain off. This protection
has a shutdown time delay of 1.5μs to prevent
premature shutdown during startup.
Figure 20. Internal Block of AR Pin
After protections trigger, FSFR-US is disabled during the
stop-time, t stop , where V Css decreases and reaches to
V CssL . The stop-time of FSFR-US can be estimated as:
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 when the sensing pin voltage
drops below -0.9V.
t STOP = C SS ? { ( R SS = R MIN ) || 5 k Ω }
? 2009 Fairchild Semiconductor Corporation
FSFR-US Series ? Rev.1.0.2
(5)
11
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FSFR1800USL | 功能描述:电源开关 IC - 配电 260W Powr Switch for Half Brdg Res Cnvtr RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| FSFR1800XS | 功能描述:功率驱动器IC 260W Fairchild PwrSW RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| FSFR1800XSL | 功能描述:功率驱动器IC 260W Fairchild PwrSW RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| FSFR1900 | 功能描述:电源开关 IC - 配电 Power Switch for Half-Bridge Resonant RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| FSFR19003 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Fairchild Power Switch (FPS⑩) for Half-Bridge Resonant Converter |
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