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| 型号： | SI9121DY-3-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 1/11页 |
| 文件大小： | 0K |
| 描述： | IC CONV ISDN PWR SUPPLY 8SOIC |
| 标准包装： | 2,500 |
| 应用： | 转换器，ISDN 电源 |
| 输入电压： | -10 V ~ -60 V |
| 输出数： | 1 |
| 输出电压： | 3V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 带卷 (TR) |
Si9121
Vishay Siliconix
High-Voltage, Non-Isolated Buck-Boost Converter
for ISDN Digital Phones
FEATURES
D Fixed +5-V or +3.3-V Output
D Integrated Floating Feedback Amplifier
D On-Chip 70-V, 1.5- W N-Channel
MOSFET Switch
D Integrated High Voltage Start-Up Circuit,
with V CC Regulator
D
D
D
D
D
? 10-V to ? 60-V Input Voltage Range
95-kHz PWM Operation
Integrated Soft-Start and Oscillator
High Efficiency Over Full Load Range
Under Voltage Lockout
D Current Mode Control
D Hiccup Mode Short Circuit
Protection
D Thermal Shutdown
D SOIC-8 Narrow-Body Package
DESCRIPTION
The Si9121 simplifies the ? 48-V to +5-V or +3.3-V converter
design for ISDN application by integrating the floating
feedback error amplifier providing direct output voltage
regulation. This approach eliminates the need for an external
shunt regulator. The Si9121 also integrates a high voltage
depletion mode MOSFET which allows the converter to be
powered directly from the high input bus voltage without
requiring an external start-up circuit. Combined with simple
magnetic design due to its non-isolated topology, the Si9121
provides a one-chip solution for complete ISDN power supply.
In order to reduce external component count, the Si9121 has
a fully integrated 95-kHz oscillator and soft-start circuit.
The Si9121 is available in both standard and lead (Pb)-free
SOIC-8 pin packages, and is offered in either +5-V or +3.3-V
fixed output options (Si9121DY-5 or Si9121DY-3,
respectively). In order to satisfy the stringent ambient
temperature requirements in many applications, the Si9121 is
rated to the industrial temperature range of ? 40 _ C to 85 _ C.
FUNCTIONAL BLOCK DIAGRAM
GND
V CC Regulator
V CC
Reference Generator
V OUT
BYPASS
COMP
Control
V NEG
C S
L X
V OUT
+5 V/400 mA
or
+3.3 V/400 mA
V NEG
? 48 V
Document Number: 71112
S-40708—Rev. C, 19-Apr-04
www.vishay.com
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SI9121DY-5 | 功能描述:直流/直流开关转换器 HV 5V Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| SI9121DY-5-E3 | 功能描述:开关变换器、稳压器与控制器 Hi-V Buck/Boost 5V Converter 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 |
| SI9121DY-5-T1 | 功能描述:直流/直流开关转换器 Hi-V Buck/Boost 5V Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| SI9121DY-5-T1-E3 | 功能描述:开关变换器、稳压器与控制器 Hi-V Buck/Boost 5V Converter 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 |
| SI9122 | 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 Drivers |
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