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参数资料
| 型号： | SI9122DQ-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM VM 20-TSSOP |
| 标准包装： | 3,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 750kHz |
| 占空比： | 95% |
| 电源电压： | 10 V ~ 13.2 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 带卷 (TR) |
Si9122
Vishay Siliconix
500-kHz Half-Bridge DC/DC Controller
with Integrated Secondary Synchronous Rectification Drivers
DESCRIPTION
Si9122 is a dedicated half-bridge IC ideally suited to fixed
telecom applications where efficiency is required at low
FEATURES
? 12 V to 72 V input voltage range
? Integrated half-bridge primary drivers
output voltages (e.g. < 3.3 V). Designed to operate within the
fixed telecom voltage range of 33 to 72 V, 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.
(1 A drive capability)
? Secondary synchronous signals with
programmable deadtime delay
? Voltage mode control
RoHS
COMPLIANT
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 625 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
? 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 protections
APPLICATIONS
? Network cards
? Power supply modules
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
12 V to 72 V
BST
Synchronous
Rectifiers
DH
LX
1 V to 12 V Typ.
+
Si9122
DL
CS2
V OUT
-
V IN_DET
CS1
C L_CONT
SR H
Error
SR L
V CC
Amplifier
+
EP
Figure 1.
Opto Isolator
-
V REF
Document Number: 71815
S-80038-Rev. J, 14-Jan-08
www.vishay.com
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SI9122E | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification Drivers |
| SI9122EDLP-T1-E3 | 功能描述:开关变换器、稳压器与控制器 500kHz DC/DC Controller RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SI9122EDQ-T1-E3 | 功能描述:开关变换器、稳压器与控制器 500kHz DC/DC Controller RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SI9123 | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:500-kHz Half-Bridge DC-DC Converter With Integrated Secondary Synchronous Rectification Control |
| SI9124 | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:500-kHz Push-Pull DC-DC Converter With Integrated Secondary Synchronous Rectification Control |
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