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參數(shù)資料
| 型號： | SI9122 |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | DC/DC Half-Bridge Controller |
| 中文描述： | 直流/直流半橋控制器 |
| 文件頁數(shù)： | 1/17頁 |
| 文件大?。?/td> | 218K |
| 代理商： | SI9122 |
Si9122
Vishay Siliconix
Document Number: 71815
S-41944—Rev. F, 18-Oct-04
www.vishay.com
1
500-kHz Half-Bridge DC-DC Converter
With Integrated Secondary Synchronous Rectification Drivers
FEATURES
12-V to 72-V Input Voltage Range
Compatible with ETSI 300 132-2
Integrated Half Bridge Primary Drivers
(1-A Drive Capability)
Secondary Synchronous 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
APPLICATIONS
Network Cards
Power Supply Modules
DESCRIPTION
Si9122 is a dedicated half-bridge IC ideally suited to fixed
telecom applications where efficiency is required at low output
voltages (e.g. <3.3 V). Designed to operate within the fixed
telecom voltage range of 33
72 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 the
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 600 kHz.
Si9122 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.
FUNCTIONAL BLOCK DIAGRAM
(Low)
Figure 1.
Voltage
Control
PWM
Current
Control
Timer
Pre-Reg
Primary
Drivers
Secondary
Drivers
Error
Amp
Opto
C
LOAD
R
LOAD
V
OUT
R
S
Power
Transformer
(High)
D
L
Pulse
Transformer
Si9122
Half-Bridge
Synchronous
Controller
BBM
V
IN
V
CC
EP
Current
Sense
CS2
Voltage
Information
R
BBM
SRH
SRL
To
V
CC
C
VIN1
+
CV
CC
D
1
D
H
CS1
C
BOOST
1.215 V
BST
L
X
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| SI9122ADLP-T1-E3 | 功能描述:開關變換器、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 |
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