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参数资料
| 型号： | SI9121DY-3-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 6/11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
PIN CONFIGURATION AND ORDERING INFORMATION
ORDERING INFORMATION
SOIC-8
Part Number
Temperature Range
Package
CS
1
8
L X
Si9121DY-5-T1
V NEG
BYPASS
COMP
2
3
4
Si9121
7
6
5
V CC
GND
V OUT
Si9121DY-5-T1—E3
Si9121DY-3-T1
Si9121DY-3-T1—E3
? 40 to 85 _ C
Tape and Reel
Top View
Si9121DY-5
Si9121DY-3
Bulk
PIN DESCRIPTION
Eval Kit
Si9121DB-5
Si9121DB-3
Temperature Range
? 10 to 70 _ C
Board Type
Surface Mount and
Thru-Hole
Pin Number
1
2
3
4
5
6
7
8
Name
CS
V NEG
BYPASS
COMP
V OUT
GND
V CC
L X
Function
Current sense pin to detect the inductor current for current mode control and over current protection
Negative supply voltage ( ? 10 V to ? 60 V)
+1.5-V bandgap reference. Decouple with 0.1 m F capacitor.
Compensation node to stabilize the converter
Output voltage feedback connected to the PWM summing comparator
Low impedance system ground
Internally generated supply voltage for the internal circuit and MOSFET drive circuit. Decouple with an external
bypass capacitor.
Inductor connection node
DETAILED DESCRIPTION
Start-Up
The UVLO circuit prevents the internal circuits from turning on
if VCC is less than 7.6 V (typical) above the negative supply
voltage at V NEG pin. With a typical hysteresis of 0.6 V, the
controller is continuously powered on until the V CC voltage
drops below 7.0 V. This hysteresis prevents the converter
from oscillating during the start-up phase and unintentionally
locking up the system. Once (V CC ? V NEG ) exceeds the UVLO
threshold the internal reference, oscillator, and soft-start
circuits are enabled.
Soft-Start
The Si9121 has an on-chip soft-start circuit which utilizes the
error amplifier external compensation network to ramp the
output NMOS transistor current limit which, in turn, allows the
output voltage to rise gradually without excessive overshoot.
The soft-start circuit is enable once the V CC voltage exceeds
www.vishay.com
6
the UVLO threshold. For the recommended frequency
compensation components (see Typical Application Circuit)
the soft-start time is approximately 10 ms.
Oscillator
The oscillator is designed to operate at a nominal frequency
of 95 kHz with no external components. The 95-kHz operating
frequency allows the converter to operate in PWM mode
during the full load condition even though the duty cycle is very
low. The 95kHz switching frequency also allows the converter
to operate at optimal efficiency without a large output inductor
and capacitor.
PWM Mode and Current Limit
The Si9121 is a current-mode converter designed to operate
in PWM mode. It features pulse-by-pulse peak current limiting
such that when the peak current sensed voltage on the CS pin
is greater than 0.67 V the switch is turned off for the remainder
of the clock cycle.
Document Number: 71112
S-40708—Rev. C, 19-Apr-04
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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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