参数资料
| 型号： | FSL206MRBN |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/14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）： | 12W |
| 工作温度： | -40°C ~ 115°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： | FSL206MRBNFSDKR |
Figure 20. 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
can flow through the SenseFET during the LEB time.
Even though the FPS has overload protection, it is not
Figure 18. 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 activated
after a specified time to determine whether it is a
transient situation or a true overload situation. 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, increasing the feedback
voltage (V FB ). If V FB exceeds 2.4V, the feedback input
diode is blocked and the 2.7μA current source (I DELAY )
starts to charge C FB slowly up. In this condition, V FB
increases until it reaches 5V, when the switching
operation is terminated, as shown in Figure 19. The
shutdown delay is the time required to charge C FB from
2.4V to 5V with 2.7μA current source.
enough to protect the FPS in that abnormal case, 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 20. When the gate turn-on signal is applied to the
power sense, 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 control IC being integrated makes it
easier to detect the temperature of the SenseFET.
When the junction temperature exceeds ~135°C,
thermal shutdown is activated and the FPS is restarted
after temperature decreases to 60°C.
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 ( refer to Figure 17 ).
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 24.5V,
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 24.5V.
Figure 19. Overload Protection (OLP)
? 2011 Fairchild Semiconductor Corporation
FSL206MR ? Rev. 1.0.5
10
www.fairchildsemi.com
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| FSL206MRL | 功能描述:电源开关 IC - 配电 Low Power 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 |
| FSL206MRN | 功能描述:电源开关 IC - 配电 Low Power 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 |
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