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参数资料
| 型号： | LTC3634IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/28页 |
| 文件大小： | 0K |
| 描述： | IC CONV DDR DDR2 DDR3 28TSSOP |
| 标准包装： | 2,500 |
| 应用： | 转换器，DDR，DDR2，DDR3 |
| 输入电压： | 1.4 V ~ 15 V |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 3 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3634
APPLICATIONS INFORMATION
? 2 π ? f C ?C OUT ? ? V OUT ?
? g m(EA) ? g m(MOD) ? ? V FBREG ?
ChoosingCompensationComponents
Loop compensation is a complicated subject and Applica-
tion Note 76 is recommended reading for a full discussion
on maximizing loop bandwidth in a current mode switch-
ing regulator. This section will provide a quick method on
choosing proper components to compensate the LTC3634
regulators.
Figure 4 shows the recommended components to be con-
nected to the ITH pin, and Figure 5 shows an approximate
bode plot of the buck regulator loop using these compo-
nents. It is assumed that the major poles in the system
(the output capacitor pole and the error amplifier output
pole) are located at a frequency lower than the crossover
frequency.
ITH
The first step is to choose the crossover frequency f C .
Higher crossover frequencies will result in a faster loop
transient response; however, in order to avoid higher or-
der loop dynamics from the switching power stage, it is
recommended that f C not exceed one-tenth the switching
frequency (f SW ).
Once f C is chosen, the value of R COMP that sets this cross-
over frequency can be calculated by the following equation:
R COMP = ? ? ? ?
where g m(EA) is the error amplifier transconductance
(see the Electrical Characteristics section), and g m(MOD)
is the modulator transconductance (the transfer function
from ITH voltage to current comparator threshold). For
the LTC3634, this transconductance is nominally 7Ω –1 .
f Z =
LTC3634
SGND
3634 F04
R COMP
C COMP
C BYP
Once R COMP is determined, C COMP can be chosen to set
the zero frequency (f Z ):
1
2 π ?C COMP ?R COMP
Figure 4. Compensation and Filtering Components
For 90° of phase margin, f Z should be chosen to be less
than one-tenth of f C .
|H(s)|
–2
Since the ITH node is sensitive to noise coupling, a small
bypass capacitor (C BYP ) may be used to filter out board
noise. However, this cap contributes a pole at f P and may
introduce some phase loss at the crossover frequency:
–1
? P
f P =
1
2 π ?C BYP ?R COMP
0dB
? Z
? C
LOG (?)
For best results, f P should be set high enough such that
phase margin is not significantly affected.
Figure 5. Bode Plot of Regulator Loop
3634 F05
If necessary, a capacitor C F (as shown in Figure 3) may
be used to add some phase lead.
3634fb
16
For more information www.linear.com/LTC3634
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相关代理商/技术参数 |
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| LTC3634IUFD#PBF | 功能描述:IC CONV DDR DDR2 DDR3 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3634IUFD#TRPBF | 功能描述:IC CONV DDR DDR2 DDR3 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3634MPFE#PBF | 制造商:Linear Technology 功能描述:IC CONV DDR DDR2 DDR3 28TSSOP 制造商:Linear Technology 功能描述:BUCK 15V 3A 500KHZ-4MHZ TS 制造商:Linear Technology 功能描述:BUCK, 15V, 3A, 500KHZ-4MHZ, TSSOP-28 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, 15V Dual 3A Monolithic Step Down Regulator for DDR Power |
| LTC3634MPFE#TRPBF | 制造商:Linear Technology 功能描述:IC REG 15V 3A STEP DOWN 28-TSSOP 制造商:Linear Technology 功能描述:DC-DC REGULATOR, BUCK, ADJ, TSSOP-28, Primary Input Voltage:15V, No. of Outputs:2, Output Current:3A, No. of Pins:28, Operating Temperature Min:-55C, Operating Temperature Max:150C, MSL:-, Package / Case:28-TSSOP , RoHS Compliant: Yes |
| LTC3634MPUFD#PBF | 制造商:Linear Technology 功能描述:IC CONV DDR DDR2 DDR3 28-QFN 制造商:Linear Technology 功能描述:BUCK 15V 3A 500KHZ-4MHZ QF |
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