参数资料
| 型号： | FSB117HNY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 14/18页 |
| 文件大小： | 0K |
| 描述： | IC FPS POWER SWITCH 8-MDIP |
| 标准包装： | 50 |
| 系列： | mWSaver™ |
| 输出隔离： | 隔离 |
| 频率范围： | 94kHz ~ 106kHz |
| 输入电压： | 7 V ~ 30 V |
| 输出电压： | 700V |
| 功率（瓦特）： | 15W |
| 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-MDIP |
| 包装： | 管件 |
| 其它名称： | FSB117HNY-ND |
is proportional to the output voltage by the transformer
coupling, the over voltage of output is indirectly detected
using V DD voltage. The OVP is triggered when V DD
voltage reaches 28 V. Debounce time (typically 150 μs) is
applied to prevent false triggering by switching noise.
Over-Temperature Protection (OTP)
The SenseFET and the control IC are integrated in one
package. This makes it easy for the control IC to detect
the abnormal over temperature of the SenseFET. If the
temperature exceeds approximately 140°C, the OTP is
triggered and the MOSFET remains off. When the
junction temperature drops by 25°C from OTP
temperature, the FSB-series resumes normal operation.
Figure 26. Burst-Mode Operation
Protections
The FSB-series provides protection function, that
include Overload / Open-Loop Protection (OLP), Over-
Voltage Protection (OVP), and Over-Temperature
Protection (OTP). 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 DD to fall. When V DD falls to
6 V, the protection is reset and HV startup circuit
charges V DD up to 12 V, allowing re-startup.
Open-Loop / Overload Protection (OLP)
Because of the pulse-by-pulse current-limit capability,
the maximum peak current through the SenseFET is
limited and maximum input power is limited. If the
output consumes more than the limited maximum
power, the output voltage (V O ) drops below the set
voltage. Then the current through the opto-coupler LED
and the transistor become virtually zero and FB voltage
is pulled HIGH as shown in Figure 27. If feedback
voltage is above 4.6 V for longer than 56 ms, OLP is
triggered. This protection is also triggered when the
feedback loop is open due to a soldering defect.
.
Figure 27. OLP Operation
V DD Over-Voltage Protection (OVP)
If the secondary-side feedback circuit malfunctions or a
solder defect causes an opening in the feedback path,
the current through the opto-coupler transistor becomes
virtually zero. Then feedback voltage 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 triggers. Because more
energy than required is provided to the output, the
output voltage may exceed the rated voltage before the
overload protection triggers, resulting in the breakdown
of the devices in the secondary side. To prevent this
situation, an OVP circuit is employed. Since V DD voltage
? 2011 Fairchild Semiconductor Corporation
FSB117H / FSB127H / FSB147H ? Rev. 1.0.7
14
Two-Level UVLO
Since all the protections of the FSB-series are auto-
restart, the power supply repeats shutdown and re-
startup until the fault condition is removed. FSB-series
has two-level UVLO, which is enabled when protection is
triggered, to delay the re-startup by slowing down the
discharge of V DD . This effectively reduces the input
power of the power supply during the fault condition,
minimizing the voltage/current stress of the switching
devices. Figure 28 shows the normal UVLO operation
and two-step UVLO operation. When V DD drops to 6 V
without triggering the protection, PWM stops switching
and V DD is charged up by the HV startup circuit.
Meanwhile, when the protection is triggered, FSB-series
has a different V DD discharge profile. Once the protection
is triggered, the IC stops switching and V DD drops. When
V DD drops to 9 V, the operating current becomes very
small and V DD is slowly discharged. When V DD is
naturally discharged down to 6 V, the protection is reset
and V DD is charged up by the HV startup circuit. Once
V DD reaches 12 V, the IC resumes switching operation.
Figure 28. Two-Level UVLO
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FSB127H | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:mWSavera?￠ Fairchild Power Switch (FPSa?￠) |
| FSB127HNY | 功能描述:电流型 PWM 控制器 Green Mode Fairchild Power Switch 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 |
| FSB137HLN | 制造商:Fairchild Semiconductor Corporation 功能描述:Green Mode Fairchild Power Switch |
| FSB147H | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:mWSaver Fairchild Power Switch |
| FSB147HNY | 功能描述:电流型 PWM 控制器 mWSaver Fairchild Power Switch (FPS) 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 |
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