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参数资料
| 型号： | FAN103MY |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC OFFLINE CTRLR PWM GREEN 8SOIC |
| 标准包装： | 1 |
| 输出隔离： | 隔离 |
| 频率范围： | 47kHz ~ 53kHz |
| 输入电压： | 5.5 V ~ 25 V |
| 功率（瓦特）： | 660mW |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 标准包装 |
| 产品目录页面： | 1221 (CN2011-ZH PDF) |
| 其它名称： | FAN103MYDKR |
Cable Voltage Drop Compensation
When it comes to cellular phone charger applications,
the battery is located at the end of cable, which causes,
typically, several percentage of voltage drop on the
actual battery voltage. FAN103 has a built-in cable
voltage drop compensation, which provides a constant
output voltage at the end of the cable over the entire
load range in CV mode. As load increases, the voltage
drop across the cable is compensated by increasing the
reference voltage of voltage regulation error amplifier.
Operating Current
The operating current in FAN103 is as small as 3.2 mA.
The small operating current results in higher efficiency
and reduces the V DD hold-up capacitance requirement.
Once FAN103 enters deep-green mode, the operating
current is reduced to 0.95 mA, assisting the power
supply in meeting power conservation requirements.
Green-Mode Operation
The FAN103 uses voltage regulation error amplifier
output (V COMV ) as an indicator of the output load and
modulates the PWM frequency, as shown in Figure 23.
The switching frequency decreases as load decreases.
In heavy load conditions, the switching frequency is
fixed at 50 kHz. Once V COMV decreases below 2.5 V, the
PWM frequency linearly decreases from 50 kHz. When
FAN103 enters into deep-green mode, the PWM
frequency is reduced to a minimum frequency of
370 Hz, gaining power saving to help meet international
power conservation requirements.
Figure 24. Frequency Hopping
High-Voltage Startup
Figure 25 shows the HV-startup circuit for FAN103
applications. The HV pin is connected to the line input or
bulk capacitor through a resistor, R START (100 k ? is
recommended). During startup, the internal startup
circuit in FAN103 is enabled. Meanwhile, line input
supplies the current, I STARTUP , to charge the hold-up
capacitor, C DD , through R START . When the V DD voltage
reaches V DD-ON , the internal startup circuit is disabled,
blocking I STARTUP from flowing into the HV pin. Once the
IC turns on, C DD is the only energy source to supply the
IC consumption current before the PWM starts to
switch. Thus, C DD must be large enough to prevent V DD
from dropping to V DD-OFF before the power can be
delivered from the auxiliary winding.
Figure 23. Switching Frequency in Green Mode
Frequency Hopping
EMI reduction is accomplished by frequency hopping,
which spreads the energy over a wider frequency range
than the bandwidth measured by the EMI test
equipment. FAN103 has an internal frequency hopping
circuit that changes the switching frequency between
47 kHz and 53 kHz with a period, as shown in Figure
24.
Figure 25. HV Startup Circuit
? 2010 Fairchild Semiconductor Corporation
FAN103 ? Rev. 1.0.7
11
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN103WMY | 功能描述:电流型 PWM 控制器 Primary-Side-Reg PWM Controller 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 |
| FAN104W | 制造商:Fairchild 功能描述:5W~10W Mobile Charger |
| FAN104WMX | 功能描述:软开关 PWM 控制器 Hi Freq Primary Side Reg PWM Controller RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| FAN1084 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:4.5A Adjustable/Fixed Low Dropout Linear Regulator |
| FAN1084D | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:4.5A Adjustable/Fixed Low Dropout Linear Regulator |
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