参数资料
| 型号： | FSL146MRBN |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC FPS POWER SWITCH 8-MDIP |
| 标准包装： | 1 |
| 系列： | FPS™ |
| 输出隔离： | 隔离 |
| 频率范围： | 61kHz ~ 73kHz |
| 输入电压： | 8 V ~ 26 V |
| 输出电压： | 650V |
| 功率（瓦特）： | 35W |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-MDIP |
| 包装： | 标准包装 |
| 其它名称： | FSL146MRBNFSDKR |
B B
4. Protection Circuits : The self-protective functions
include: Overload Protection (OLP), Abnormal Over-
Current Protection (AOCP), Output-Short Protection
(OSP), Over-Voltage Protection (OVP), and Thermal
Shutdown (TSD). All the protections are implemented as
Auto Restart Mode. Once the fault condition is detected,
switching is terminated and the SenseFET remains off.
This causes V CC to fall. When V CC falls to the Under-
Voltage Lockout (UVLO) stop voltage of 7.5V, the
protection is reset and the startup circuit charges the
V CC capacitor. When V CC reaches the start voltage of
12.0V, normal operation resumes. If the fault condition
is not removed, the SenseFET remains off and V CC
drops to stop voltage again. In this manner, the Auto-
Restart can alternately enable and disable the switching
of the power SenseFET until the fault condition is
eliminated. Because these protection circuits are fully
integrated into the IC without external components, the
reliability is improved without increasing cost.
continues increasing until it reaches 7.0V, when the
switching operation is terminated, as shown in Figure
20. The delay for shutdown is the time required to
charge C FB from 2.5V to 7.0V with 2.0μA. A 25 ~
50ms delay is typical for most applications. This
protection is implemented in Auto-Restart Mode.
V DS
Power
on
Fault
occurs
Fault
removed
Figure 20. Overload Protection
4.2 Abnormal Over-Current Protection (AOCP) :
When the secondary rectifier diodes or the
transformer pins are shorted, a steep current with
extremely high di/dt can flow through the SenseFET
V CC
12.0V
7.5V
Normal Fault Normal
operation situation operation
Figure 19. Auto-Restart Protection Waveforms
t
during the minimum turn-on time. Even though the
FSL146MRBN has overload protection, it is not
enough to protect the FSL146MRBN in that abnormal
case; since severe current stress is imposed on the
SenseFET until OLP is triggered. The internal AOCP
circuit is shown in Figure 21. When the gate turn-on
signal is applied to the power SenseFET, the AOCP
block is enabled and monitors the current through the
sensing resistor. The voltage across the resistor is
compared with a preset AOCP level. If the sensing
resistor voltage is greater than the AOCP level, the
set signal is applied to the S - R latch, resulting in the
shutdown of the SMPS.
4.1 Overload Protection (OLP) : Overload is defined
as the load current exceeding its normal level due to
an unexpected abnormal event. In this situation, the
protection circuit should trigger to protect the SMPS.
However, in normal operation, the overload protection
circuit can be triggered during load transition. To
avoid this undesired operation,
the overload
protection circuit is designed to trigger only after a
specified time to determine whether it is a transient
situation or a true overload situation. Because of the
pulse-by-pulse current-limit capability, the maximum
peak current through the SenseFET is limited and,
therefore, the maximum input power is restricted with
a given input voltage. If the output consumes more
than this maximum power, the output voltage (V OUT )
decreases below the set voltage. This reduces the
current through the opto-coupler LED, which also
reduces the opto-coupler transistor current, thus
increasing the feedback voltage (V FB ). If V FB exceeds
2.5V, D1 is blocked and the 2.0μA current source
starts to charge C FB slowly up . In this condition, V FB
? 2012 Fairchild Semiconductor Corporation
FSL146MRBN ? Rev. 1.0.0
10
Figure 21. Abnormal Over-Current Protection
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
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| FSL156MRBN | 功能描述:电源开关 IC - 配电 Green-Mode FPS 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 |
| FSL156MRIN | 功能描述:电源开关 IC - 配电 Green-Mode Fairchild Power Switch 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 |
| FSL176MRT | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green-Mode Fairchild Power Switch (FPSa?￠) |
| FSL176MRTUDTU | 功能描述:电流型 PWM 控制器 GRN Mode PowerSwitch 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 |
| FSL2 | 制造商:Cooper Crouse-Hinds 功能描述: |
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