参数资料
| 型号： | FSFR1800XS |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 9/14页 |
| 文件大小： | 0K |
| 描述： | IC FPS PWR SWITCH 260W 9-SIP |
| 标准包装： | 19 |
| 系列： | FPS™ |
| 输出隔离： | 隔离 |
| 频率范围： | 94kHz ~ 106kHz |
| 输入电压： | 9.6 V ~ 25 V |
| 输出电压： | 500V |
| 功率（瓦特）： | 260W |
| 工作温度： | -40°C ~ 130°C |
| 封装/外壳： | 9-SIP 成形引线 |
| 供应商设备封装： | 9-SIP |
| 包装： | 管件 |
Functional Description
1. Basic Operation . FSFR-XS series is designed to
drive high-side and low-side MOSFETs complementarily
with 50% duty cycle. A fixed dead time of 350 ns is
introduced between consecutive transitions, as shown in
Figure 15.
Figure 15. MOSFETs Gate Drive Signal
2. Internal Oscillator : FSFR-XS series employs a
current-controlled oscillator, as shown in Figure 16.
Figure 17. Resonant Converter Typical Gain Curve
Internally, the voltage of R T pin is regulated at 2 V and
the charging / discharging current for the oscillator
capacitor, C T , is obtained by copying the current flowing
out of the R T pin (I CTC ) using a current mirror. Therefore,
the switching frequency increases as I CTC increases.
Figure 18. Frequency Control Circuit
Figure 16. Current-Controlled Oscillator
To prevent excessive inrush current and overshoot of
3. Frequency Setting : Figure 17 shows the typical
voltage gain curve of a resonant converter, where the
gain is inversely proportional to the switching frequency
in the ZVS region. The output voltage can be regulated
by modulating the switching frequency. Figure 18 shows
the typical circuit configuration for the R T pin, where the
opto-coupler transistor is connected to the R T pin to
modulate the switching frequency.
The minimum switching frequency is determined as:
output voltage during startup, increase the voltage gain
of the resonant converter progressively. Since the
voltage gain of the resonant converter is inversely
proportional to the switching frequency, the soft-start is
implemented by sweeping down the switching frequency
from an initial high frequency ( f I S S ) until the output
voltage is established. The soft-start circuit is made by
connecting R-C series network on the R T pin, as shown
in Figure 18. FSFR-XS series also has a 3ms internal
soft-start to reduce the current overshoot during the initial
f min ?
5.2 k ?
R min
? 100( kHz )
(1)
cycles, which adds 40 kHz to the initial frequency of the
external soft-start circuit, as shown in Figure 19. The
initial frequency of the soft-start is given as:
Assuming the saturation voltage of opto-coupler
transistor is 0.2 V, the maximum switching frequency is
determined as:
f ISS ? (
5.2 k ?
R min
?
5.2 k ?
R SS
) ? 100 ? 40 ( kHz )
(3)
?
f max ? (
5.2 k ? 4.68 k ?
R min R max
) ? 100( kHz )
(2)
? 2010 Fairchild Semiconductor Corporation
FSFR-XS Series ? Rev.1.0.2
9
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FSFR1800XSL | 功能描述:功率驱动器IC 260W Fairchild PwrSW 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 |
| FSFR1900 | 功能描述:电源开关 IC - 配电 Power Switch for Half-Bridge Resonant RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| FSFR19003 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Fairchild Power Switch (FPS⑩) for Half-Bridge Resonant Converter |
| FSFR2000 | 功能描述:开关变换器、稳压器与控制器 Power Switch for Half-Bridge Resonant 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 |
| FSFR20003 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Fairchild Power Switch (FPS⑩) for Half-Bridge Resonant Converter |
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