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参数资料
| 型号： | SI9122ADLP-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 MLP65-20 |
| 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： | 10.5 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： | PowerPAK? MLP65-20 |
| 包装： | 带卷 (TR) |
Si9122A
Vishay Siliconix
500-kHz Half-Bridge DC/DC Controller
with Integrated Secondary Synchronous Rectification Drivers
DESCRIPTION
FEATURES
Si9122A is a half-bridge controller IC ideally suited to fixed
telecom applications where high efficiency is required at low
?
?
28 V to 75 V input voltage range
Compatible with ETSI 300 132-2
output voltages (e.g. < 3.3 V). Designed to operate within the
fixed telecom voltage range of 33 V to 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
?
?
Integrated ± 1 A half-bridge primary drivers
Secondary synchronous rectifier control
signals with programmable deadtime delay
RoHS
COMPLIANT
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
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?
?
?
?
?
?
?
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
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
APPLICATIONS
? Network cards
? Power supply modules
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
28 V to 75 V
BST
Synchronous
Rectifiers
DH
LX
1 V to 12 V Typ.
+
Si9122A
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: 73492
S-80038-Rev. D, 14-Jan-08
www.vishay.com
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SI9122ADQ-T1-E3 | 功能描述:DC/DC 开关控制器 500kHz DC/DC Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| SI9122DLP-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 |
| SI9122DQ | 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 |
| SI9122DQ-T1 | 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 |
| SI9122DQ-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 |
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