参数资料
| 型号： | FSB117HNY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 12/18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 |
Functional Description
Startup Operation
The HV pin is typically connected to the AC line input
through two external diodes and one resistor (R HV ), as
shown in Figure 18. When the AC line voltage is
applied, the V DD hold-up capacitor is charged by the line
voltage through the diodes and resistor. After V DD
voltage reaches the turn-on threshold voltage (V DD-ON ),
the startup circuit charging V DD capacitor is switched off
and V DD is supplied by the auxiliary winding of the
transformer. Once the FSB-series starts, it continues
operation until V DD drops below 6 V (V DD-OFF1 ). The IC
startup time with a given AC line input voltage is:
PWM Control
The FSB-series employs current-mode control, as
shown in Figure 19. An opto-coupler (such as the
H11A817A) and shunt regulator (such as the KA431) are
typically used to implement the feedback network.
Comparing the feedback voltage with the voltage across
the R sense resistor makes it possible to control the
switching duty cycle. A synchronized positive slope is
added to the SenseFET current information to guarantee
stable current-mode control over a wide range of input
voltage. The built-in slope compensation stabilizes the
current loop and prevents sub-harmonic oscillation.
V AC ? IN ?
t STARTUP ? R HV ? C DD ? ln
V AC ? IN ?
2 2
?
2 2
?
? V DD ? ON
(1)
Figure 19. Current Mode Control
Soft-Start
Figure 18. Startup Circuit
Brown-in/out Function
The HV pin can detect the AC line voltage using a
switched voltage divider that consists of external
resistor (R HV ) and internal resistor (R LS ), as shown in
Figure 18. The internal line sensing circuit detects the
real RMS value of the line voltage using sampling circuit
and peak detection circuit. Since the voltage divider
causes power consumption when it is switched on, the
switching is driven by a signal with a very narrow pulse
width to minimize power loss. The sampling frequency
is adaptively changed according to the load condition to
minimize the power consumption in light-load condition.
Based on the detected line voltage, brown-in and
brownout thresholds are determined. Since the internal
resistor (R LS ) of the voltage divider is much smaller than
R HV , the thresholds are given as:
The FSB-series has an internal soft-start circuit that
progressively increases the pulse-by-pulse current limit
level of MOSFET during startup to establish the correct
working conditions for transformers and capacitors, as
shown in Figure 20. The current limit levels have nine
steps, as shown in Figure 21. This prevents transformer
saturation and reduces stress on the secondary diode
during startup.
?
V BROWN ? IN ( RMS ) ?
R HV V AC ? ON
200 k 2
(2)
?
V BROWN ? OUT ( RMS ) ?
R HV V AC ? OFF
200 k 2
(3)
Figure 20. Soft-Start and Current-Limit Circuit
? 2011 Fairchild Semiconductor Corporation
FSB117H / FSB127H / FSB147H ? Rev. 1.0.7
12
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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