参数资料
| 型号： | FSL136MR |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/13页 |
| 文件大小： | 0K |
| 描述： | IC PWM/SEMSEFET SMPS 3A 8-DIP |
| 标准包装： | 50 |
| 系列： | FPS™ |
| 输出隔离： | 隔离 |
| 频率范围： | 61kHz ~ 73kHz |
| 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 |
is lower than 1.0μs, the FPS recognizes this condition
as an abnormal error and shuts down PWM switching
until V CC reaches V START again. An abnormal condition
output is shown in Figure 20.
Figure 20.
Soft-Start
Output Short Waveforms (OSP)
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 15ms, 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 6k ? 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 6k ?
when the internal diodes are biased by the main current
source of 400μA. For example, FSL136MR has a typical
SenseFET peak current limit (I LIM ) of 2.15A. I LIM can be
adjusted to 1.5A by inserting Rx between the I PK pin and
the ground. The value of the Rx can be estimated by
the following equations:
2.15A : 1.5A = 6kΩ : XkΩ
X = Rx || 6kΩ
where X is the resistance of the parallel network.
(1)
(2)
Figure 21.
Internal Soft-Start
Burst Operation
To minimize power dissipation in standby mode, the
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
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.
? 2009 Fairchild Semiconductor Corporation
FSL136MR ? Rev. 1.0.7
11
Figure 23. Peak Current Limit Adjustment
www.fairchildsemi.com
相关PDF资料 |
PDF描述 |
|---|---|
| FSL137HNY | IC FPS PWR SWITCH 100KHZ 8-MDIP |
| FSL146MRBN | IC FPS POWER SWITCH 8-MDIP |
| FSL156MRBN | IC FPS POWER SWITCH 8-MDIP |
| FSL206MRBN | IC FPS POWER SWITCH 8-MDIP |
| FSQ0265RLX | IC FPS PWR SWITCH VSC 8A 8-LSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| FSL137H | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch |
| FSL137H_10 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch |
| FSL137HNY | 功能描述:电源开关 IC - POE / LAN 3A/700V 100kHz Power Switch RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6 |
发布紧急采购，3分钟左右您将得到回复。