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| 型号： | FAN7621N |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 12/17页 |
| 文件大小： | 0K |
| 描述： | IC OFF-LINE CTRLR PROG PFM 16DIP |
| 标准包装： | 25 |
| 输出隔离： | 隔离 |
| 频率范围： | 94kHz ~ 106kHz |
| 功率（瓦特）： | 1.56W |
| 工作温度： | -40°C ~ 130°C |
| 封装/外壳： | 16-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 16-DIP |
| 包装： | 管件 |
| 产品目录页面： | 1222 (CN2011-ZH PDF) |
5.7 Overload Protection (OLP) : Overload is
defined as the load current exceeding its normal level
6.
PCB Layout Guideline
V Cr p ? p
V CON =
due to an unexpected abnormal event. In this situation,
the protection circuit should trigger to protect the power
supply. However, even when the power supply is in the
normal condition, the overload situation can occur during
the load transition. To avoid premature triggering of
protection, the overload protection circuit should be
designed to trigger only after a specified time to
determine whether it is a transient situation or a true
overload situation. Figure 27 shows a typical overload
protection circuit. By sensing the resonant capacitor
voltage on the control pin, the overload protection can be
implemented. Using RC time constant, shutdown delay
can be also introduced. The voltage obtained on the
control pin is given as:
C B (7)
2( C B + C sense )
Duty imbalance problems may occur due to the radiated
noise from main transformer, the inequality of the
secondary-side leakage inductances of main
transformer, and so on. Among them, it is one of the
dominant reasons that the control components in the
vicinity of R T pin are enclosed by the primary current flow
pattern on PCB layout. The direction of the magnetic
field on the components caused by the primary current
flow is changed when the high-and-low side MOSFET
turns on by turns. The magnetic fields with opposite
direction from each other induce a current through, into,
or out of the R T pin, which makes the turn-on duration of
each MOSFET different. It is strongly recommended to
separate the control components in the vicinity of R T pin
from the primary current flow pattern on PCB layout.
Figure 28 shows an example for the duty-balanced case.
The yellow and blue lines show the primary current flows
where V Cr
voltage.
p-p
is the amplitude of the resonant capacitor
when the lower-side and higher-side MOSFETs turns on,
respectively. The primary current does not enclose any
component of controller.
5.8 Over-Voltage Protection (OVP) : When the
LV CC reaches 23V, OVP is triggered. This protection is
used when auxiliary winding of the transformer to supply
V CC to the controller is utilized.
It is helpful to reduce the duty imbalance to make the
loop configured between CON pin and opto-coupler as
small as possible, as shown in the red line in Figure 28.
5.9 Thermal Shutdown (TSD) : If the temperature
of the junction exceeds approximately 130 ° C, the
thermal shutdown triggers.
Figure 28. Example for Duty Balancing
? 2009 Fairchild Semiconductor Corporation
FAN7621 ? Rev. 1.0.3
12
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN7621S | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:PFM Controller for Half-Bridge Resonant Converters |
| FAN7621SJ | 功能描述:功率驱动器IC PWM Control IC for High Power FPS RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| FAN7621SJX | 功能描述:功率驱动器IC PWM Control IC for High Power FPS RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| FAN7621SSJ | 功能描述:开关变换器、稳压器与控制器 Contr. for Half-Brdg Resonant Converters RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| FAN7621SSJX | 功能描述:电流型 PWM 控制器 CONTROL IC OF 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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