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參數(shù)資料
| 型號： | Si9117 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | High-Frequency Converter for Telecom Applications(通訊應(yīng)用的高頻電流模式轉(zhuǎn)換器) |
| 中文描述： | 高頻電信應(yīng)用轉(zhuǎn)換器（通訊應(yīng)用的高頻電流模式轉(zhuǎn)換器） |
| 文件頁數(shù)： | 1/15頁 |
| 文件大小： | 476K |
| 代理商： | SI9117 |
Si9117
Vishay Siliconix
Si9117
FaxBack 408-970-5600, request 70027
www.siliconix.com
S-60752—Rev. D, 05-Apr-99
1
High-Frequency Converter for Telecom Applications
FEAT URES
On-board high-voltage, 1-
Switching FET
Switching Frequencies of Up to 1 MHz
Synchronization Capability
Easily Compensated Current-Mode Operation
DES CRIPT ION
The Si9117 high-efficiency converter for telecom systems
running off 48 V is ideal for emerging applications such as
interactive video (IV) set-top boxes and microcell base
stations, such as those used for Personal Communications
Systems (PCS). IV set-top boxes and microcell base stations
typically require less than 15 W of power and have access to
the analog telephone line power. Both IV set-top boxes and
microcell base stations process extremely low-level,
modulated analog signals (on the order of
μ
Vs), making the
frequency and energy content of radiated and conducted
noise a major issue. These application circuits are also
constrained in terms of available board space and place a
premium on minimal footprint.
The combination of an on-board, high-voltage, 1-
switch and
a PWM IC with operational input voltage of 200 V allows
operation off of the analog telephone line, even with the worst
case battery voltage and ringing voltage. Once the converter
has started up, a simple bootstrap circuit can provide power to
the IC by raising the source voltage of the n-channel,
depletion mode, start-up FET above its gate voltage of 9.2 V.
This technique lowers system costs, reduces the area
required for circuit implementation, and minimizes circuit
power consumption.
Processing high-frequency, modulated analog signals for
video or RF requires receivers with sensitivities in the range of
0.5 to 25
μ
V. At these levels, noise generated by switchmode
power conversion can impair the signal recovery process.
Controlling radiated noise is a matter of proper layout and
shielding. Controlling conducted noise is a matter of limiting
its energy and isolating the conducted energy’s fundamental
and harmonic frequencies to bands which will not affect the
frequencies of interest. The high-frequency, synchronized
switching of the Si9117 enables this design requirement.
First, for a given output current, high-frequency switching
attenuates output ripple, minimizing conducted energy.
Second, synchronizing the high switching frequency to an
external frequency allows the fundamental and its harmonics
to be moved out of range of the frequency bands of interest.
An additional benefit of high-frequency switching is reduced
size and cost of the inductor and the output filter capacitance.
In addition to these mandatory design considerations, the
Si9117 is easy to design with and compensate, and takes a
minimum of board area to implement: an important benefit in
high-volume/small-package applications such as set-top
boxes and microcell base stations.
APPLICAT ION CIRCUIT
Operates with Input Voltages Up to 200 V
1.8-MHz Error Amplifier
Soft-Start
Latched SHUTDOWN
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| SI9117DY | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1MHz HV Sw Mode Reg RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| SI9117DY-E3 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Hi Freq Converter For Telecom App RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SI9117DY-T1 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Hi Freq Converter For Telecom App RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| SI9117DY-T1-E3 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Hi Freq Converter For Telecom App RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SI9118 | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:Programmable Duty Cycle Controller |
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