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參數(shù)資料
| 型號(hào)： | SI9123 |
| 廠商： | Vishay Intertechnology,Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 500-kHz Half-Bridge DC-DC Converter With Integrated Secondary Synchronous Rectification Control |
| 中文描述： | 500千赫半橋型DC - DC與集成的次級(jí)同步整流控制轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 1/16頁(yè) |
| 文件大小： | 181K |
| 代理商： | SI9123 |
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Si9123
Vishay Siliconix
New Product
Document Number: 72098
S-03639—Rev. B, 20-Mar-03
www.vishay.com
1
500-kHz Half-Bridge DC-DC Converter With
Integrated Secondary Synchronous Rectification Control
FEATURES
12-V to 72-V Input Voltage Range
Compatible with ETSI 300 132-2 100 V, 100-ms
Transients
Integrated Half-Bridge 1-A Primary Drivers
Secondary Synchronous Rectifier Control
Voltage Mode Control
Voltage Feedforward Compensation
High Voltage Pre-Regulator Operates During Start-Up
Current Sensing On Low-Side Primary Device
Hiccup Current Control During Shorted Load
Low Input Voltage Detection
Programmable Soft-Start Function
Programmable Oscillator Frequency
Over Temperature Protection
APPLICATIONS
Network Cards
Power Supply Modules
DESCRIPTION
Si9123 is a dedicated half-bridge controller IC ideally suited to
fixed telecom dc-dc converter applications where high
efficiency is required at low output voltages (e.g. <3.3 V).
Designed to operate within the voltage range of 12-72 V and
withstand 100 V, 100 ms transients, the IC is capable of
controlling and directly driving both primary side MOSFET
switches of a half-bridge circuit.
High conversion efficiency is achieved by use of synchronous
rectifying MOSFET transistors in the secondary. 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
for today’s low
output voltages. On-chip control of the dead time delays
between the primary and secondary signals keep efficiencies
high and prevents accidental destruction of the power
transformer or wasted energy from self timed approaches.
Such a system can achieve conversion efficiencies well in
excess of 90%.
FUNCTIONAL BLOCK DIAGRAM
Driver
Logic
Pulse
Transformer
SEC_SYNC
R
S
-
Figure 1.
Voltage
Control
Current
Control
Pre-Reg
Primary
Drivers
Secondary
Drivers
Error
Amp
Opto
C
LOAD
R
LOAD
V
OUT
Power
Transformer
(High)
D
L
Si9123
Half-Bridge
Synchronous
Controller
V
INEXT
V
CC
EP
CS2
Voltage
Information
To
V
CC
C
VIN1
+
CV
CC
D
1
D
H
CS1
C
BOOST
1.215 V
BST
L
X
Soft-
Start
PWM
C
SS
SS
R
EXT
V
IN
(Low)
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| SI9124 | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:500-kHz Push-Pull DC-DC Converter With Integrated Secondary Synchronous Rectification Control |
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| SI9124DQ-T1 | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:500-kHz Push-Pull DC-DC Converter With Integrated Secondary Synchronous Rectification Control |
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