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| 型号： | FSL136HR |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/14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 |
Fault
V DS
Power
on
occurs
Fault
removed
2.5R
OSC
PWM
S
Q
Gate
R
Q
driver
R
LEB
V CC
AOCP
R sense
V AOCP
2
GND
12V
8V
t
Figure 19. Abnormal Over-Current Protection
Abnormal Over-Current Protection (AOCP)
When the secondary rectifier diodes or the transformer
pin are shorted, a steep current with extremely high di/dt
Normal
operation
Fault
situation
Normal
operation
can flow through the SenseFET during the LEB time.
Even though the FPS has OLP (Overload Protection), it
is not enough to protect the FPS in that abnormal case,
Figure 17. Auto-Restart Protection Waveforms
Overload Protection (OLP)
Overload is defined as the load current exceeding a pre-
set level due to an unexpected event. In this situation,
the protection circuit should be activated to protect the
SMPS. However, even when the SMPS is operating
normally, the overload protection (OLP) circuit can be
activated during the load transition or startup. To avoid
this undesired operation, the OLP circuit is designed to
be activated after a specified time to determine whether
it is a transient situation or a true overload situation.
In conjunction with the I PK current limit pin (if used), the
current-mode feedback path limits the current in the
SenseFET when the maximum PWM duty cycle is
attained. If the output consumes more than this
maximum power, the output voltage (V O ) decreases
below its rating 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 2.4 V, the
feedback input diode is blocked and the 5 μA current
source (I DELAY ) slowly starts to charge C FB . In this
condition, V FB increases until it reaches 6 V, when the
switching operation is terminated, as shown in Figure
18. The shutdown delay is the time required to charge
C FB from 2.4 V to 6 V with 5 μA current source.
V FB
Overload Protection
6V
2.4 V
t 12 = C FB × (V(t 2 )-V(t 1 )) / I DELAY
since severe current stress is imposed on the
SenseFET until OLP triggers. The FPS includes the
internal AOCP (Abnormal Over-Current Protection)
circuit shown in Figure 19. 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 latch, resulting in the shutdown of the SMPS.
Thermal Shutdown (TSD)
The SenseFET and the control IC are integrated,
making it easier for the control IC to detect the
temperature of the SenseFET. When the temperature
exceeds approximately 137°C, thermal shutdown is
activated.
Over-Voltage Protection (OVP)
In the event of a malfunction in the secondary-side
feedback circuit or an open feedback loop caused by a
soldering defect, the current through the opto-coupler
transistor becomes almost zero. Then, V FB climbs up in
a similar manner to the overload situation, forcing the
preset maximum current to be supplied to the SMPS
until the overload protection is activated. Because
excess energy is provided to the output, the output
voltage may exceed the rated voltage before the
overload protection is activated, resulting in the
breakdown of the devices in the secondary side. To
prevent this situation, an over-voltage protection (OVP)
circuit is employed. In general, V CC is proportional to the
output voltage and the FPS uses V CC instead of directly
monitoring the output voltage. If V CC exceeds 24 V, OVP
circuit is activated, resulting in termination of the
switching operation. To avoid undesired activation of
OVP during normal operation, V CC should be designed
to be below 24 V.
Output-Short Protection (OSP)
If the output is shorted, the steep current with extremely
t 1
t 2
t
high di/dt can flow through the SenseFET during the
LEB time. Such a steep current brings high-voltage
Figure 18. Overload Protection (OLP)
? 2011 Fairchild Semiconductor Corporation
FSL136HR ? Rev. 1.0.1
10
stress on the drain of SenseFET when turned off. To
protect the device from such an abnormal condition,
www.fairchildsemi.com
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相关代理商/技术参数 |
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| 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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