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参数资料
| 型号： | SI9140CQ-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 14/19页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 16-TSSOP |
| 标准包装： | 3,000 |
| PWM 型： | 电流/电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 2MHz |
| 电源电压： | 3 V ~ 6.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 带卷 (TR) |
Si9140
Vishay Siliconix
Product is End of Life 3/2014
+ PP
P Dissipation in switch
I RMS SW 2 x R SW +
Q SW x V IN x f OSC
2
I
x V O x
2
C
x f OSC
I RMS SW
I PEAK 2 + I PP 2 + I PEAK x I PP x
V O
3 x V IN
P Dissipation in synchronous rectification
I RMS RECT2 x R RECT +
Q RECT x V IN x f OSC
2
I
RMS RECT
I PEAK 2 + I PP 2 + I PEAK x I PP x
(V IN - V O )
3 x V IN
I PP = I PEAK + I
I RMSSW
R SW
=
=
Switch rms current
Switch on resistance
I
V O2
L x f OSC x V IN
I RMSRECT
R RECT
Q SW
Q RECT
V IN
=
=
=
=
=
Synchronous rectifier rms current
Synchronous rectifier on resistance
Total gate charge of switch
Total gate charge of synchronous rectifier
Input voltage
I PEAK
P IN - (0.5 x V O x
V O
I)
V O
I O
=
=
Output voltage
Output current
f OSC
=
Switching frequency
P IN
V O x I O
C
=
=
efficiency
Crossover time
Current
I O
I PP
I PEAK
0A
time
Inductor
The size and value of the inductor are critical in meeting
overall circuit dimensional requirements and in assuring
proper transient voltage regulation. The size of the core is
determined by the output power, the material of the core, and
the operating frequency. To handle higher output power, the
core must be larger. Luckily, a higher switching frequency
will lower the inductance value, decreasing the core size.
However, a higher switching frequency can also mean
greater core loss.
www.vishay.com
14
In applications where the dc flux density is high and the ac
flux density swing is only 100 to 200 gauss, the core loss will
be negligible compared to the wire loss. Kool Mu is the best
material to use at 500 kHz to deliver 30 W in the minimum
volume. Ferrite has a lower core cost and loss at this fre-
quency, but the core size is fairly large. If the power supply is
designed on the motherboard and space is not a critical
issue, ferrite is a better choice.
The higher switching frequency reduces the core size by
decreasing the amount of energy that must be stored
between switching periods. It also accelerates the transient
response to the load by decreasing the inductance value.
The inductance is calculated with following equation:
Document Number: 70026
S-40699-Rev. H, 19-Apr-04
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SI9140CY | 功能描述:电压模式 PWM 控制器 SMP Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| SI9140CY-E3 | 功能描述:电压模式 PWM 控制器 Switching Power Supply Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| SI9140CY-T1 | 功能描述:电压模式 PWM 控制器 Switching Power Supply Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| SI9140CY-T1-E3 | 功能描述:电压模式 PWM 控制器 Switching Power Supply Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| SI9140DQ | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:SMP Controller For High Performance Process Power Supplies |
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