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| 型号： | SI9140CY-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 11/19页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 16-SOIC |
| 标准包装： | 2,500 |
| 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-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
Product is End of Life 3/2014
Si9140
Vishay Siliconix
The functions of each circuit are explained in detail below.
Design equations are provided to optimize each application
circuit.
PWM Controller
There are generally two types of controllers, voltage mode or
current mode. In voltage mode control, an error voltage is
generated by comparing the output voltage to the reference
voltage. The error voltage is then compared to an artificial
ramp, and the result is the duty cycle necessary to regulate
the output voltage. In current mode, an actual inductor cur-
rent is used, in place of the artificial ramp, to sense the volt-
age across the current sense resistor.
The logic and timing sequence for voltage mode control is
shown in Figure 5. The Si9140 offers voltage mode control,
which is better suited for applications requiring both fast tran-
sient response and high output current.
Current mode control requires a current sense resistor to
monitor the inductor current. A 10 m Ω sense resistor in a
10 A design will dissipate 1 W, decreasing efficiency by
3.5 %. Such a design would require a 2 W resistor to satisfy
derating criteria, besides requiring additional board space.
Voltage mode control is a second-order LC system and has
a faster natural transient response compared to current
mode control (first-order RC system). Current mode has the
advantage of providing an inherently good line regulation.
But the situations where line voltage is fixed, as in the point-
of-use conversion for microprocessors, this feature is
wasted. Current mode control also provides automatic pulse-
to-pulse current limiting. This feature requires a current
sense resistor as stated above. These characteristics make
voltage mode control ideal for high-end microprocessor
power supplies.
OSC
COMP
D S
D R
The error amplifier of the PWM controller plays a major role
in determining the output voltage, stability, and the transient
response of the power supply. In the Si9140, the non-invert-
ing input of the error amplifier is available for use with an
external precision reference for tighter tolerance regulation.
With a two-pair lead-lag compensation network, it is easy to
create a stable 100 kHz closed loop converter with the
Si9140 error amplifier.
The Si9140 achieves the 5 μS transient response by gener-
ating a 100 kHz closed-loop bandwidth. This is possible only
by switching above 400 kHz and utilizing an error amplifier
with at least a 10 MHz bandwidth. The Si9140 controller has
a 25 MHz unity gain bandwidth error amplifier. The switching
frequency must be at least four times greater than the
desired closed-loop bandwidth to prevent oscillation. To
respond to the stimuli, the error amplifier bandwidth needs to
be at least 10 times larger than the desired bandwidth.
Phase
Gain
Frequency (Hz)
Figure 6. 100 kHz BW Synchronous Buck Converter
The Si9140 solution requires only three 330 μF OS-CON
capacitors on the output of power supply to meet the 10 A
transient requirement. Other converter solutions on the mar-
ket with 20 to 50 kHz closed loop bandwidths typically require
two to five times the output capacitance specified above to
match the Si9140’s performance.
The theoretical issues and analytical steps involved in com-
pensating a feedback network are beyond the scope of this
application note. However, to ease the converter design for
today’s high-performance microprocessors, typical compo-
nent values for the feedback network are provided in Table 1
for various combinations of output capacitance. Figure 6
shows the Bode plot (frequency domain) of the 2.9 V con-
verter shown schematically in Figure 1.
Figure 5. Voltage Mode Logic and Timing Diagram
Document Number: 70026
S-40699-Rev. H, 19-Apr-04
www.vishay.com
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SI9140DQ | 制造商:VISHAY 制造商全称:Vishay Siliconix 功能描述:SMP Controller For High Performance Process Power Supplies |
| SI9140DQ-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 |
| SI9140DQ-T1-E3 | 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 |
| SI9140DY | 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 |
| SI9140DY-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 |
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