- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄368621 > SI9121DY-5-T1 (Vishay Intertechnology,Inc.) High-Voltage, Non-Isolated Buck-Boost Converter for ISDN Digital Phones PDF資料下載
參數(shù)資料
| 型號： | SI9121DY-5-T1 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | High-Voltage, Non-Isolated Buck-Boost Converter for ISDN Digital Phones |
| 中文描述： | 高電壓，非隔離的Buck - Boost對ISDN數(shù)字電話交換器 |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 109K |
| 代理商： | SI9121DY-5-T1 |
SOIC-8
Si9121
CS
L
X
V
NEG
V
CC
BYPASS
GND
COMP
V
OUT
5
6
7
8
Top View
2
3
4
1
Si9121
Vishay Siliconix
www.vishay.com
6
Document Number: 71112
S-40708—Rev. C, 19-Apr-04
PIN CONFIGURATION AND ORDERING INFORMATION
ORDERING INFORMATION
Part Number
Temperature Range
Package
Si9121DY-5-T1
Si9121DY-5-T1—E3
Tape and Reel
Si9121DY-3-T1
40 to 85 C
Si9121DY-3-T1—E3
Si9121DY-5
Bulk
Si9121DY-3
Eval Kit
Temperature Range
Board Type
Si9121DB-5
10 to 70 C
Surface Mount and
Thru-Hole
Si9121DB-3
PIN DESCRIPTION
Pin Number
Name
Function
1
CS
Current sense pin to detect the inductor current for current mode control and over current protection
2
V
NEG
BYPASS
Negative supply voltage (
10 V to
60 V)
3
+1.5-V bandgap reference. Decouple with 0.1 F capacitor.
4
COMP
Compensation node to stabilize the converter
5
V
OUT
GND
Output voltage feedback connected to the PWM summing comparator
6
Low impedance system ground
7
V
CC
Internally generated supply voltage for the internal circuit and MOSFET drive circuit. Decouple with an external
bypass capacitor.
8
L
X
Inductor connection node
DETAILED DESCRIPTION
Start-Up
The UVLO circuit prevents the internal circuits from turning on
if VCC is less than 7.6 V (typical) above the negative supply
voltage at V
NEG
pin. With a typical hysteresis of 0.6 V, the
controller is continuously powered on until the V
CC
voltage
drops below 7.0 V. This hysteresis prevents the converter
from oscillating during the start-up phase and unintentionally
locking up the system. Once (V
CC
V
NEG
) exceeds the UVLO
threshold the internal reference, oscillator, and soft-start
circuits are enabled.
Soft-Start
The Si9121 has an on-chip soft-start circuit which utilizes the
error amplifier external compensation network to ramp the
output NMOS transistor current limit which, in turn, allows the
output voltage to rise gradually without excessive overshoot.
The soft-start circuit is enable once the V
CC
voltage exceeds
the UVLO threshold. For the recommended frequency
compensation components (see Typical Application Circuit)
the soft-start time is approximately 10 ms.
Oscillator
The oscillator is designed to operate at a nominal frequency
of 95 kHz with no external components. The 95-kHz operating
frequency allows the converter to operate in PWM mode
during the full load condition even though the duty cycle is very
low. The 95kHz switching frequency also allows the converter
to operate at optimal efficiency without a large output inductor
and capacitor.
PWM Mode and Current Limit
The Si9121 is a current-mode converter designed to operate
in PWM mode. It features pulse-by-pulse peak current limiting
such that when the peak current sensed voltage on the CS pin
is greater than 0.67 V the switch is turned off for the remainder
of the clock cycle.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SI9121DY-5-T1-E3 | High-Voltage, Non-Isolated Buck-Boost Converter for ISDN Digital Phones |
| SI9121 | High-Voltage, Non-Isolated Buck-Boost Converter for ISDN Digital Phones |
| SI9122A | 500-kHz Half-Bridge DC/DC Controller With Integrated Secondary Synchronous Rectification Drivers |
| SI9124 | 500-kHz Push-Pull DC-DC Converter With Integrated Secondary Synchronous Rectification Control |
| SI9124DQ | 500-kHz Push-Pull DC-DC Converter With Integrated Secondary Synchronous Rectification Control |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SI9121DY-5-T1-E3 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Hi-V Buck/Boost 5V Converter 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 |
| SI9122 | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:500-kHz Half-Bridge DC-DC Converter With Integrated Secondary Synchronous Rectification Drivers |
| SI9122_08 | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification Drivers |
| SI9122A | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification Drivers |
| SI9122A_08 | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification Drivers |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。