参数资料
| 型号： | FSFR2100USL |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC FPS POWER SWITCH 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）： | 400W |
| 工作温度： | -40°C ~ 130°C |
| 封装/外壳： | 9-SIP |
| 供应商设备封装： | 9-SIP |
| 包装： | * |
Functional Description
1. Basic Operation: FSFR-US series is designed to
drive high-side and low-side MOSFETs complementarily
with 50% duty cycle. A fixed dead time of 350ns is
introduced between consecutive transitions, as shown in
Figure 15.
Figure 15. MOSFETs Gate Drive Signal
) until the output
from an initial high frequency ( f
f min =
× 100( kHz )
5.2 k Ω
2. Internal Oscillator : FSFR-US series employs a
current-controlled oscillator, as shown in Figure 16.
Internally, the voltage of R T pin is regulated at 2V 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 16. Current Controlled Oscillator
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:
(1)
R min
Assuming the saturation voltage of opto-coupler
Figure 17. Resonant Converter Typical Gain Curve
Figure 18. Frequency Control Circuit
To prevent excessive inrush current and overshoot of
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
ISS
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-US series also has an internal soft-
start for 3ms to reduce the current overshoot during the
initial cycles, which adds 40kHz 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:
= (
+
) × 100( kHz )
5.2 k Ω 4.68 k Ω
transistor is 0.2V, the maximum switching frequency is
determined as:
f max (2)
R min R max
f ISS = (
5.2 k Ω
R min
+
5.2 k Ω
R SS
) × 100 + 40 ( kHz )
(3)
? 2009 Fairchild Semiconductor Corporation
FSFR-US Series ? 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 |
|---|---|
| FSFR2100XS | 功能描述:开关变换器、稳压器与控制器 FSFR2100U for 400W Power Switch 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 |
| FSFR2100XSL | 功能描述:开关变换器、稳压器与控制器 400W Power Sw for Half-Brdg Res Convtr 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 |
| FSFR502Y | 制造商:Panduit Corp 功能描述:FIBER RISER CABLE, 50UM ZIPCRD 制造商:Panduit Corp 功能描述:FIBER RISER CABLE, 50UM ZIPCRD INTERCONN - Cable Rools/Shrink Tubing |
| FSFR601Y | 制造商:Panduit Corp 功能描述:FIBER RISER CABLE, 62.5UMSMPLX 制造商:Panduit Corp 功能描述:FIBER RISER CABLE, 62.5UMSMPLX INTERCONN - Cable Rools/Shrink Tubing |
| FSFR602Y | 制造商:Panduit Corp 功能描述:FIBER RISER CABLE, 62.5UMZIPCR 制造商:Panduit Corp 功能描述:FIBER RISER CABLE, 62.5UMZIPCRD INTERCON - Cable Rools/Shrink Tubing |
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