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| 型号： | FSL136HR |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 9/14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 |
Functional Description
Startup
At startup, an internal high-voltage current source
supplies the internal bias and charges the external
capacitor (C A ) connected with the V CC pin, as illustrated
in Figure 14. When V CC reaches the start voltage of
12 V, the FPS ? begins switching and the internal high-
voltage current source is disabled. The FPS continues
normal switching operation and the power is provided
from the auxiliary transformer winding unless V CC goes
below the stop voltage of 8 V.
Feedback Control
The FSL136HR employs current-mode control, as shown
in Figure 16. An opto-coupler (such as the FOD817A)
and shunt regulator (such as the KA431) are typically
used to implement the feedback network. Comparing the
feedback voltage with the voltage across the R SENSE
resistor makes it possible to control the switching duty
cycle. When the shunt regulator reference pin voltage
exceeds the internal reference voltage of 2.5 V, the opto-
coupler LED current increases, the feedback voltage V FB
is pulled down, and the duty cycle is reduced. This
typically occurs when the input voltage is increased or the
output load is decreased.
Figure 14. Startup Circuit
Figure 16. Pulse-Width-Modulation Circuit
Oscillator Block
The oscillator frequency is set internally and the FPS
has a random frequency fluctuation function. Fluctuation
of the switching frequency of a switched power supply
can reduce EMI by spreading the energy over a wider
frequency range than the bandwidth measured by the
EMI test equipment. The amount of EMI reduction is
directly related to the range of the frequency variation.
The range of frequency variation is fixed internally;
however, its selection is randomly chosen by the
combination of external feedback voltage and internal
free-running oscillator. This randomly chosen switching
frequency effectively spreads the EMI noise nearby
switching frequency and allows the use of a cost-
effective inductor instead of an AC input line filter to
satisfy the world-wide EMI requirements.
Leading-Edge Blanking (LEB)
At the instant the internal SenseFET is turned on, the
primary-side capacitance and secondary-side rectifier
diode reverse recovery typically cause a high-current
spike through the SenseFET. Excessive voltage across
the R SENSE resistor leads to incorrect feedback operation
in the current mode PWM control. To counter this effect,
the FPS employs a leading-edge blanking (LEB) circuit
( see the Figure 16 ). This circuit inhibits the PWM
comparator for a short time (t LEB ) after the SenseFET is
turned on.
Protection Circuits
The FPS has several protective functions, such as
overload protection (OLP), over-voltage protection
(OVP), output-short protection (OSP), under-voltage
I DS
several
m seconds
t SW =1/f SW
lockout (UVLO), abnormal over-current protection
(AOCP), and thermal shutdown (TSD). Because these
various protection circuits are fully integrated in the IC
without external components, the reliability is improved
without increasing cost. Once a fault condition occurs,
t SW
switching is terminated and the SenseFET remains off.
D t
t
This causes V CC to fall. When V CC reaches the UVLO
stop voltage V STOP (8 V), the protection is reset and the
f SW + 1/2 D f SW
f SW
MAX
internal high-voltage current source charges the V CC
capacitor via the V STR pin. When V CC reaches the UVLO
start voltage V START (12 V), the FPS resumes normal
f SW - 1/2 D f SW
several
miliseconds
no repetition
MAX
operation. In this manner, the auto-restart can
alternately enable and disable the switching of the
power SenseFET until the fault condition is eliminated.
t
Figure 15. Frequency Fluctuation Waveform
? 2011 Fairchild Semiconductor Corporation
FSL136HR ? Rev. 1.0.1
9
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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