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| 型号： | FSQ0465RUWDTU |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 15/22页 |
| 文件大小： | 0K |
| 描述： | IC SWIT PWM GREEN UVLO HV TO220F |
| 产品变化通告： | Product Discontinuation 27/Feb/2012 |
| 标准包装： | 400 |
| 系列： | FPS™ |
| 输出隔离： | 隔离 |
| 频率范围： | 59.6kHz ~ 75.8kHz |
| 输入电压： | 8.5 V ~ 21 V |
| 输出电压： | 650V |
| 功率（瓦特）： | 60W |
| 工作温度： | -25°C ~ 85°C |
| 封装/外壳： | TO-220FL |
| 供应商设备封装： | TO-220F-6L（成形） |
| 包装： | 管件 |
| 产品目录页面： | 1222 (CN2011-ZH PDF) |
resulting in the termination of the switching operation. To
avoid undesired activation of OVP during normal
operation, V CC should be designed below 19V.
4.5 Thermal Shutdown with Hysteresis (TSD) : The
SenseFET and the control IC are built in one package.
This enables the control IC to detect the abnormally high
temperature of the SenseFET. If the temperature
exceeds approximately 140°C, the thermal shutdown
triggers IC shutdown. The IC recovers its operation when
the junction temperature decreases 60°C from TSD
temperature and V CC reaches startup voltage (V start ).
5. Soft-Start : The FPS has an internal soft-start circuit
that increases PWM comparator inverting input voltage
with the SenseFET current slowly after it starts up. The
typical soft-start time is 17.5ms. The pulse width to the
power switching device is progressively increased to
V O
Vo set
V FB
0.55V
0.35V
I DS
V DS
establish the correct working conditions for transformers,
FSQ0465 Rev. 00
time
inductors, and capacitors. The voltage on the output
capacitors is progressively increased with the intention of
t1
Switching
disabled
t2
t3
Switching
disabled
t4
smoothly establishing the required output voltage. This
mode helps prevent transformer saturation and reduces
Figure 32. Waveforms of Burst Operation
stress on the secondary diode during startup.
7. Switching Frequency Limit : To minimize switching
6. Burst Operation : To minimize power dissipation in
standby mode, the FPS enters burst-mode operation. As
the load decreases, the feedback voltage decreases. As
shown in Figure 32, the device automatically enters
burst-mode when the feedback voltage drops below
V BURL (350mV). At this point, switching stops and the
output voltages start to drop at a rate dependent on
standby current load. This causes the feedback voltage
to rise. Once it passes V BURH (550mV), switching
resumes. The feedback voltage then falls and the
process repeats. Burst-mode operation alternately
enables and disables switching of the power SenseFET,
thereby reducing switching loss in standby mode.
? 2009 Fairchild Semiconductor Corporation
FSQ0465RU Rev. 1.0.0
15
loss and Electromagnetic Interference (EMI), the
MOSFET turns on when the drain voltage reaches its
minimum value in quasi-resonant operation. However,
this causes switching frequency to increases at light-load
conditions. As the load decreases or input voltage
increases, the peak drain current diminishes and the
switching frequency increases. This results in severe
switching losses at light-load condition, as well as
intermittent switching and audible noise. These problems
create limitations for the quasi-resonant converter
topology in a wide range of applications.
To overcome these problems, FSQ-series employs a
frequency-limit function, as shown in Figures 33 and
Figure 34. Once the SenseFET is turned on, the next
turn-on is prohibited during the blanking time (t B ). After
the blanking time, the controller finds the valley within
the detection time window (t W ) and turns on the
MOSFET, as shown in Figures 33 and Figure 34 (Cases
A, B, and C). If no valley is found during t W , the internal
SenseFET is forced to turn on at the end of t W (Case D).
Therefore, the devices have a minimum switching
frequency of 48kHz and a maximum switching frequency
of 67kHz.
www.fairchildsemi.com
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相关代理商/技术参数 |
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| FSQ0465RWDTU | 功能描述:电源开关 IC - 配电 FPS FOR LCD 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 |
| FSQ0565R | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green-Mode Fairchild Power Switch (FPS⑩) for Quasi-Resonant Operation - Low EMI and High Efficiency |
| FSQ0565R_08 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green-Mode Fairchild Power Switch (FPS⑩) for Quasi-Resonant Operation - Low EMI and High Efficiency |
| FSQ0565RQ | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green-Mode Fairchild Power Switch (FPS) for Quasi-Resonant Operation - Low EMI and High Efficiency |
| FSQ0565RQLDTU | 功能描述:开关变换器、稳压器与控制器 SMPS Power switch (QRC) 5A 650V 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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