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| 型號(hào)： | SI9117 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | High-Frequency Converter for Telecom Applications |
| 中文描述： | 高頻轉(zhuǎn)換器的電信應(yīng)用 |
| 文件頁(yè)數(shù)： | 7/15頁(yè) |
| 文件大小： | 132K |
| 代理商： | SI9117 |
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Si9117
Vishay Siliconix
Document Number: 70027
S-40750—Rev. E, 19-Apr-04
www.vishay.com
7
BLOCK DIAGRAM
+
V
V
CC
V
REF
V+
SD
R
OSC
C
OSC
SS
COMP
NI
FB
NC
D
S
I
SENSE
SYNC
Ref
+
+
9.2 V
0.2 V
R
S
Q
S
R
Q
V
20 A
20 A
+
+
Oscillator
1.25 V
2 V
B2
APPLICATIONS
Description of Operation
The Si9117 is a current mode PWM IC combined with an
integrated 1- 200-V MOSFET. Current mode operation offers
the following advantages:
Cycle-by-cycle current limit protection
Simple loop compensation, eliminating the effect of output
inductor
Excellent fast transient response due to inner control loop
Automatic input voltage feed-forward compensation
In addition, the Si9117 is duty-cycle limited to avoid core
saturation.
High Voltage Pre-Regulator
All switchmode power supplies face a start-up problem caused
by the large difference between dc bus voltage and the V
CC
power rail for supplying the control circuit. The traditional
technique has been to keep the control circuit in “sleep mode,”
while a small amount of energy is used to “top up” a large
enough electrolytic capacitor to get the circuit started. When
the circuit starts operating, a winding on the transformer is then
used to power the control circuit. Disadvantages with this type
of circuit include delayed start-up and large required
capacitances for guaranteed operation over the full voltage
range. The Si9117 overcomes these problems by using low
power consumption, BiC/DMOS circuitry, and a unique
high-voltage depletion mode MOSFET (see Figure 1).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI9117DY | 功能描述:直流/直流開(kāi)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(kāi)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(kāi)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(kāi)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(kāi)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(kāi)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(kāi)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(kāi)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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