参数资料
| 型号： | FSL156MRBN |
| 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）： | 40W |
| 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： | FSL156MRBNFSDKR |
B B
4. Protection Circuits : The FSL156MRBN has several
self-protective functions, such as 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. 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, reliability is
improved without increasing cost.
C FB slowly up . In this condition, V FB 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
t
during the minimum turn-on time. Even though the
FSL156MRBN has overload protection, it is not
enough to protect in that abnormal case due to the
severe current stress 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
Normal
operation
Fault
situation
Normal
operation
preset AOCP level. If the sensing resistor voltage is
greater than the AOCP level, the set signal is applied
Figure 19. Auto-Restart Protection Waveforms
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, even when the SMPS is in normal
operation, the overload protection circuit can be
triggered during the 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, increasing the
feedback voltage (V FB ). If V FB exceeds 2.5V, D1 is
blocked and the 2.0μA current source starts to charge
? 2012 Fairchild Semiconductor Corporation
FSL156MRBN ? 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 |
|---|---|
| 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: |
| FSL206MR | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green Mode Fairchild Power Switch (FPSa?￠) |
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