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| 型号： | FSL136HR |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/14页 |
| 文件大小： | 0K |
| 描述： | IC FPS SWITCH PWM/SENSEFET 8MDIP |
| 标准包装： | 50 |
| 系列： | FPS™ |
| 输出隔离： | 隔离 |
| 频率范围： | 90kHz ~ 110kHz |
| 输入电压： | 9 V ~ 26 V |
| 输出电压： | 650V |
| 功率（瓦特）： | 26W |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-DIP |
| 包装： | 管件 |
OSP detects V FB and SenseFET turn-on time. When the
V FB is higher than 1.6 V and the SenseFET turn-on time
is lower than 1.2 μs, the FPS recognizes this condition
as an abnormal error and shuts down PWM switching
until V CC reaches V START again. An abnormal condition
V O
Vo set
V FB
V FB
V OUT
MOSFET
Drain
Current
D
Rectifier
Diode
Current
Turn-off delay
Minimum
turn-on time
1.6us
I LIM
V OSP
0.5V
0.35V
I DS
I OUT
output short occurs
V DS
Figure 20. Output Short Waveforms (OSP)
Soft-Start
t1
Switching
disabled
t2
t3
Switching
disabled
t4
time
The FPS has an internal soft-start circuit that slowly
increases the feedback voltage, together with the
SenseFET current after it starts. The typical soft-start
time is 20 ms, as shown in Figure 21, where progressive
increments of the SenseFET current are allowed during
the startup phase. The pulse width to the power
switching device is progressively increased to establish
the correct working conditions for transformers,
inductors, and capacitors. The voltage on the output
capacitors is progressively increased with the intention
of smoothly establishing the required output voltage.
Soft-start helps prevent transformer saturation and
reduce the stress on the secondary diode.
Figure 22. Burst-Mode Operation
Adjusting Peak Current Limit
As shown in Figure 23, a combined 6 k Ω internal
resistance is connected to the non-inverting lead on the
PWM comparator. An external resistance of Rx on the
current limit pin forms a parallel resistance with the 6 k Ω
when the internal diodes are biased by the main current
source of 400 μA. For example, FSL136HR has a
typical SenseFET peak current limit (I LIM ) of 2.15 A. I LIM
can be adjusted to 1.5 A by inserting Rx between the I PK
pin and the ground. The value of the Rx can be
estimated by the following equations:
I LIM
16 Steps
1.25ms
2.15A : 1.5A ? 6kΩ : XkΩ
X ? Rx || 6kΩ
(1)
(2)
where X is the resistance of the parallel network.
Current Limit
Vcc
Vcc
0.25I LIM
Drain
Current
t
V FB
3
I DELAY
I FB
400μA
4.25k Ω
PWM
Figure 21. Internal Soft-Start
1.7k Ω
Burst Operation
To minimize power dissipation in standby mode, the
Rx
I PK
4
Current
Sense
FPS enters burst mode. As the load decreases, the
feedback voltage decreases. As shown in Figure 22, the
device automatically enters burst mode when the
Figure 23. Peak Current Limit Adjustment
feedback voltage drops below V BURH .
Switching
continues until the feedback voltage drops
below V BURL . At this point, switching stops and the
output voltages drop at a rate dependent on standby
current load. This causes the feedback voltage to rise.
Once it passes V BURH , switching resumes. The feedback
voltage then falls and the process repeats. Burst mode
alternately enables and disables switching of the
SenseFET and reduces switching loss in standby mode.
? 2011 Fairchild Semiconductor Corporation
FSL136HR ? Rev. 1.0.1
11
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FSL136HRL | 功能描述:电源开关 IC - 配电 Green Mode Fairchild Power Switch (FPS) RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 开启电阻（最大值）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压: 电源电流（最大值）: 最大工作温度: 安装风格: 封装 / 箱体: |
| FSL136HRLX | 制造商:Fairchild Semiconductor Corporation 功能描述:Power Switch 3A T/R 制造商:Fairchild Semiconductor Corporation 功能描述:FPS FOR LOW POWER - Tape and Reel 制造商:Fairchild Semiconductor Corporation 功能描述:IC FPS SWITCH PWM/SENSEFET 8LSOP 制造商:Fairchild Semiconductor Corporation 功能描述:Power Switch ICs - Power Distribution Green Mode Fairchild Power Switch (FPS) 制造商:Fairchild Semiconductor Corporation 功能描述:TAPE REEL / Green Mode Fairchild Power Switch |
| FSL136MR | 功能描述:电流型 PWM 控制器 FPS FOR LOW POWER RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| FSL136MRT | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green-Mode Fairchild Power Switch (FPSa?￠) |
| FSL136MRTWDTU | 功能描述:电源开关 IC - 配电 4Ohms 1.35mA 50W 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 |
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