参数资料
| 型号： | FSL127HNY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC PWM/SEMSEFET SMPS 8-MDIP |
| 标准包装： | 59 |
| 系列： | FPS™ |
| 输出隔离： | 隔离 |
| 频率范围： | 94kHz ~ 106kHz |
| 输入电压： | 9 V ~ 30 V |
| 输出电压： | 700V |
| 功率（瓦特）： | 20W |
| 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 |
Functional Description
Startup Operation
For startup, the HV pin is connected to the line input or
bulk capacitor through the external resistor R HV , as
shown in Figure 23. Typical startup current drawn from
the HV pin is 3.5mA and it charges the V DD capacitor
through the resistor R HV . The startup current turns off
when the V DD capacitor voltage reaches V DD-ON . The
V DD capacitor maintains V DD until the auxiliary winding
of the transformer provides the operating current.
Green-Mode Operation
The FSL127H uses feedback voltage (V FB ) as an
indicator of the output load and modulates the PWM
frequency, as shown in Figure 25, such that the
switching frequency decreases as load decreases. In
heavy load conditions, the switching frequency is
100kHz. Once V FB decreases below V FB-N (2.5V), the
PWM frequency starts to linearly decrease from 100kHz
to 18kHz to reduce the switching losses. As V FB
decreases below V FB-G (2.4V), the switching frequency
is fixed at 18kHz and FSL127H enters “deep” green
C DC
R HV
mode to reduce the standby power consumption. As
V FB decreases below V FB-ZDC (2.1V), FSL127H enters
burst-mode operation. When V FB drops below V FB-ZDC ,
FSL127H stops switching and the output voltage starts
HV
FSL127H
VDD
D DD
C DD
N A
to drop, which causes the feedback voltage to rise.
Once V FB rises above V FB-ZDC , switching resumes. Burst
mode alternately enables and disables switching,
thereby reducing switching loss to improve power
saving, as shown in Figure 26.
AC line
Figure 23. Startup Circuit
Slope Compensation
FSL127H is designed for flyback power converter. The
peak-current-mode control is used to optimize system
performance. Slope compensation is added to stabilize
the current loop. The FSL127H inserts a synchronized,
positively sloped ramp at each switching cycle.
Soft Start
Figure 25. PWM Frequency
The FSL127H has internal soft-start circuit that slowly
increases the SenseFET current after startup. The
typical soft-start time is 5ms, during which the V Limit
level is increased in six steps to smoothly establish the
required output voltage, as shown in Figure 24. It also
helps prevent transformer saturation and reduces stress
on the secondary diode during startup.
Figure 24. Soft-Start Function
Figure 26. Burst Mode Operation
? 2010 Fairchild Semiconductor Corporation
FSL127H ? Rev. 1.0.2
10
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FSL127HNYI | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FSL128MRT | 制造商:Fairchild 功能描述:30W STB Power Supply |
| FSL128MRTWDTU | 功能描述:电源开关 IC - POE / LAN GreenMode Pwr Switch for Hi Input Voltage RoHS:否 制造商:Fairchild Semiconductor 开关数量:Single 开关配置:SPST 开启电阻（最大值）:7.3 Ohms 串话: 带宽: 开启时间（最大值）:13 ns 关闭时间（最大值）:20 ns 切换电压（最大）: 工作电源电压:8 V to 26 V 最大工作温度:+ 125 C 安装风格:Through Hole 封装 / 箱体:TO-220F-6 |
| FSL130D | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:8A, 100V, 0.230 Ohm, Rad Hard, SEGR Resistant, N-Channel Power MOSFETs |
| FSL130D1 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:8A, 100V, 0.230 Ohm, Rad Hard, SEGR Resistant, N-Channel Power MOSFETs |
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