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參數(shù)資料
| 型號： | SI9122A |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | 500-kHz Half-Bridge DC/DC Controller With Integrated Secondary Synchronous Rectification Drivers |
| 中文描述： | 500千赫半橋DC / DC變換器與集成的次級同步整流驅(qū)動器控制器 |
| 文件頁數(shù)： | 1/15頁 |
| 文件大?。?/td> | 241K |
| 代理商： | SI9122A |
Si9122A
Vishay Siliconix
Document Number: 73492
S–51921—Rev. A, 12-Sep-05
www.vishay.com
1
500-kHz Half-Bridge DC/DC Controller
With Integrated Secondary Synchronous Rectification Drivers
28-V to 75-V Input Voltage Range
Compatible with ETSI 300 132-2
Integrated 1–A Half Bridge Primary Drivers
Secondary Synchronous Rectifier Control Signals With
Programmable Deadtime Delay
Voltage Mode Control
Voltage Feedforward Compensation
High Voltage Pre-Regulator Operates During Start-Up
Current Sensing On Low-Side Primary Device
Frequency Foldback Eliminates Constant Current Tail
Advanced Maximum Current Control During Start-Up and
Shorted Load
Low Input Voltage Detection
Programmable Soft-Start Function
Over Temperature Protection
Network Cards
Power Supply Modules
Si9122A is a half-bridge controller IC ideally suited to fixed
telecom applications where high efficiency is required at low
output voltages (e.g. <3.3 V). Designed to operate within the
fixed telecom voltage range of 33–75 V and withstand 100 V,
100 ms transients, the IC is capable of controlling and driving
both the low and high-side switching devices of a half bridge
circuit and also controlling the switching devices on the
secondary side of the bridge. Due to the very low on-resistance
of the secondary MOSFETs, a significant increase in
conversion efficiency can be achieved as compared with
conventional Schottky diodes. Control of the secondary
devices is by means of a pulse transformer and a pair of
inverters. Such a system has efficiencies well in excess of 90%
even for low output voltages. On-chip control of the dead time
delays between the primary and secondary synchronous
signals keep efficiencies high and prevent accidental
destruction of the power transformer. An external resistor sets
the switching frequency from 200 kHz to 625 kHz.
Si9122A has advanced current monitoring and control circuitry
which allow the user to set the maximum current in the primary
circuit. Such a feature acts as protection against output
shorting and also provides constant current into large
capacitive loads during start-up or when paralleling power
supplies. Current sensing is by means of a sense resistor on
the low-side primary device.
Figure 1.
BST
DH
LX
DL
CS2
CS1
SR
H
EP
C
L_CONT
R
V
I
V
C
V
IN_DET
S
V
R
R
O
B
G
P
Si9122A
28 V to 75 V
Synchronous
Rectifiers
V
CC
–
+
V
REF
Error
Amplifier
Opto Isolator
V
OUT
+
–
1 V to 12 V Typ.
SR
L
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| SI9122ADLP-T1-E3 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 500kHz DC/DC Controller 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: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SI9122ADQ-T1-E3 | 功能描述:DC/DC 開關(guān)控制器 500kHz DC/DC Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| SI9122DLP-T1-E3 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 500kHz DC/DC Controller 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: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SI9122DQ | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 500kHz DC/DC Controller 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: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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