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參數資料
| 型號： | SI9117 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | High-Frequency Converter for Telecom Applications |
| 中文描述： | 高頻轉換器的電信應用 |
| 文件頁數： | 11/15頁 |
| 文件大?。?/td> | 132K |
| 代理商： | SI9117 |
Si9117
Vishay Siliconix
Document Number: 70027
S-40750—Rev. E, 19-Apr-04
www.vishay.com
11
10
100
1000
10
100
1000
V
CC
R
120 k
C
1 F
C
T
V
IN
R
t
C
t
R
68 k
SW
1
SW
1
Closed = Frequency High
SW
1
Open = Frequency Low
D
1
R
OSC
Oscillator Resistance (kHz)
f
C
OSC
= 47 pF
100 pF
150 pF
200 pF
FIGURE 6.
Oscillator Frequency Selection
FIGURE 7.
Frequency Shifting Using R
t
Current Change
FIGURE 8.
Oscillator Synchronization
Si9117
IC1
SS
COMP
R
OSC
FB
C
OSC
NI
SYNC
V
REF
V
SD
V
CC
V+
I
SENSE
NC
S
D
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Rt
Ct
Si9117
IC2
SS
COMP
R
OSC
FB
C
OSC
NI
SYNC
V
REF
V
SD
V
CC
V+
I
SENSE
NC
S
D
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Si9117
IC3
SS
COMP
R
OSC
FB
C
OSC
NI
SYNC
V
REF
V
SD
V
CC
V+
I
SENSE
NC
S
D
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
The current in R
T
is set by V = IR where V = 4 V and R = R
T
.
Using a diode, and some type of switch, the frequency can be
easily changed: when SW
1
is closed, D
1
is reverse biased, and
has no effect on R
T
. When SW
1
is open, current flows through
R
1
and D
1
into R
T
and removes some of the current supplied
by the internal emitter follower.
Synchronization
The
SYNC
input allows operation from a master clock as the
connection is made after the divide-by-two. As a result,
synchronization in both frequency and phase is possible. This
unique feature is important to systems designers who use
multiple
converters,
where
unsynchronized “beating” effect is present and causes difficult
EMI/EMC problems. If an external clock is used, duty cycles of
> 50% are possible due to the position of the
SYNC
pin , after
the divide-by-two. Where > 50% conduction is used, core reset
must be allowed, in order to prevent core saturation.
Synchronization is in master/slave mode, with one device (the
“master”) setting the switching frequency and others (the
“slaves”) with disabled oscillators locked to it. Alternatively, all
devices can be clocked using a master oscillator. (See
Figure 8.)
noise
caused
by
an
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相關代理商/技術參數 |
參數描述 |
|---|---|
| SI9117DY | 功能描述:直流/直流開關轉換器 1MHz HV Sw Mode Reg RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| SI9117DY-E3 | 功能描述:開關變換器、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 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SI9117DY-T1 | 功能描述:直流/直流開關轉換器 Hi Freq Converter For Telecom App RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| SI9117DY-T1-E3 | 功能描述:開關變換器、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 開關頻率:1 MHz 工作溫度范圍: 安裝風格: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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