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参数资料
| 型号： | FSFR1700L |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/18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）： | 200W |
| 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 |
in Figure 19. FSFR-series also has an internal soft-start
for 3ms to reduce the current overshoot during the initial
cycles, which adds 40kHz to the initial frequency of the
external soft-start circuit, as shown in Figure 20. The
initial frequency of the soft-start is given as:
f ISS = (
5.2 k Ω
R min
+
5.2 k Ω
R SS
) × 100 + 40 ( kHz )
(3)
It is typical to set the initial frequency of soft-start two ~
three times the resonant frequency ( f O ) of the resonant
network.
The soft-start time is three to four times of the RC time
constant. The RC time constant is as follows:
T SS = R SS ? C SS
f s
(4)
Figure 22. Control Pin Configuration for
Pulse Skipping
Remote On / Off : When an auxiliary power supply is
used for standby, the main power stage using FSFR-
series can be shut down by pulling down the control pin
f ISS
40kHz
Control loop
take over
time
voltage, as shown in Figure 23. R1 and C1 are used to
ensure soft-start when switching resumes.
Main
OP1
Output
R1
Figure 20. Frequency Sweeping of Soft-start
4. Control Pin : The FSFR-series has a control pin for
FPS
C1
Main Off
protection, cycle skipping, and remote on/off. Figure 21
shows the internal block diagram for control pin.
R T
R min
Aux
Output
CON
OP1
Figure 23. Remote On / Off Circuit
Figure 21. Internal Block of Control Pin
Protection : When the control pin voltage exceeds 5V,
protection is triggered. Detailed applications are
described in the protection section.
Pulse Skipping : FSFR-series stops switching when the
control pin voltage drops below 0.4V and resumes
switching when the control pin voltage rises above 0.6V.
To use pulse-skipping, the control pin should be
connected to the opto-coupler collector pin. The
frequency that causes pulse skipping is given as:
4. Current Sensing Method
Current Sensing Using Resistor: FSFR-series senses
drain current as a negative voltage, as shown in Figure
24 and Figure 25. Half-wave sensing allows low power
dissipation in the sensing resistor, while full-wave
sensing has less switching noise in the sensing signal.
SKIP
=
5 . 2 k
R min
+
4 . 16 k
R max
x 100 ( kHz )
(5)
? 2007 Fairchild Semiconductor Corporation
FSFR series Rev.1.0.9
11
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FSFR1700S | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FSFR1700US | 功能描述:开关变换器、稳压器与控制器 HIGH POWER FPS RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| FSFR1700USL | 功能描述:开关变换器、稳压器与控制器 200W Powr Switch for Half Brdg Res Cnvtr RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| FSFR1700XS | 功能描述:开关变换器、稳压器与控制器 200W Power Switch RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| FSFR1700XSL | 功能描述:开关变换器、稳压器与控制器 200W Fairchild PwrSW RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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