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| 型号： | PTH08T255WAD |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | DC-DC REG PWR SUPPLY MODULE |
| 封装： | PLASTIC, MODULE-22 |
| 文件页数： | 3/34页 |
| 文件大小： | 4336K |
| 代理商： | PTH08T255WAD |
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Designing for Fast Load Transients
Capacitor Table
www.ti.com ........................................................................................................................................................................................... SLTS290 – NOVEMBER 2008
The transient response of the dc/dc converter has been characterized using a load transient with a di/dt of
2.5A/s. The typical voltage deviation for this load transient is given in the Electrical Characteristics table using
the minimum required value of output capacitance. As the di/dt of a transient is increased, the response of a
converter’s regulation circuit ultimately depends on its output capacitor decoupling network. This is an inherent
limitation with any dc/dc converter once the speed of the transient exceeds its bandwidth capability.
If the target application specifies a higher di/dt or lower voltage deviation, the requirement can only be met with
additional low ESR ceramic capacitor decoupling. Generally, with load steps greater than 100A/s, adding
multiple 10F ceramic capacitors plus 10×1F, and numerous high frequency ceramics (
≤0.1F) is all that is
required to soften the transient higher frequency edges. The PCB location of these capacitors in relation to the
load is critical. DSP, FPGA and ASIC vendors identify types, location and amount of capacitance required for
optimum performance. Low impedance buses, unbroken PCB copper planes, and components located as close
as possible to the high frequency devices are essential for optimizing transient performance.
Table 3 identifies the characteristics of acceptable capacitors from a number of vendors. The recommended
number of capacitors required at both the input and output buses is identified for each capacitor.
This is not an extensive capacitor list. Capacitors from other vendors are available with comparable
specifications. Those listed are for guidance. The RMS ripple current rating and ESR (at 100 kHz) are critical
parameters necessary to ensure both optimum regulator performance and long capacitor life.
Table 3. Input/Output Capacitors(1)
Capacitor Characteristics
Quantity
Max
Output Bus
Max.
Ripple
Capacitor Vendor,
Working
ESR at
Value
Current
Physical
Input
Type Series (Style)
No
Voltage
100
Vendor Part No.
TurboTrans
(F)
at 85°C
Size (mm)
Bus
Turbo
(V)
kHz
(Cap Type)(2)
(Irms)
Trans
(
Ω)
(mA)
Panasonic
25
1000
0.043
1690
16 × 15
1
≥ 2(3)
N/R(4)
EEUFC1E102S
FC (Radial)
25
1800
0.029
2205
16 × 20
1
≥ 1(3)
N/R(4)
EEUFC1E182
FC (SMD)
25
2200
0.028
2490
18 × 21,5
1
≥ 1(3)
N/R(4)
EEVFC1E222N
FK (SMD)
25
1000
0.060
1100
12,5×13,5
1
≥ 2(5)
N/R(4)
EEVFK1V102Q
United Chemi-Con
PTB Poly-Tant (SMD)
6.3
330
0.025
2600
7,3x4,3x 2,8
N/R(6)
3 - 4(3)
(C)
≥ 2(2)
4PTB337MD6TER
LXZ, Aluminum (Radial)
25
680
0.068
1050
10 × 16
1
2 - 3(3)
N/R(4)
LXZ25VB681M10X20LL
PS, Poly-Alum (Radial)
16
330
0.014
5060
10 × 12,5
2
3
(B)
≥ 2(2)
16PS330MJ12
PXA, Poly-Alum (SMD)
16
330
0.014
5050
10 × 12,2
2
3
(B)
≥ 2(2)
PXA16VC331MJ12TP
PS, Poly-Alum (Radial)
6.3
680
0.010
5500
10 × 12,5
N/R(6)
2
(C)
≥ 1(2)
6PS680MJ12
PXA, Poly-Alum (Radial)
6.3
680
0.010
5500
10 × 12,2
N/R(6)
2
(C)
≥ 1(2)
PXA6.3VC681MJ12TP
(1)
Capacitor Supplier Verification
Please verify availability of capacitors identified in this table. Capacitor suppliers may recommend alternative part numbers because of
limited availability or obsolete products. In some instances, the capacitor product life cycle may be in decline and have short-term
consideration for obsolescence.
RoHS, Lead-free and Material Details
See the capacitor suppliers regarding material composition, RoHS status, lead-free status, and manufacturing process requirements.
Component designators or part number deviations can occur when material composition or soldering requirements are updated.
(2)
Required capacitors with TurboTrans. See the TransTrans Application information for Capacitor Selection
Capacitor Type Groups by ESR (Equivalent Series Resistance) :
a. Type A = (100 < capacitance × ESR
≤ 1000) (use Type A capacitors in addition to Type B or C)
b. Type B = (1,000 < capacitance × ESR
≤ 5,000)
c. Type C = (5,000 < capacitance × ESR
≤ 10,000)
(3)
Total bulk nonceramic capacitors on the output bus with ESR of
≥ 15m to ≤ 30m requires an additional ≥ 200 F of ceramic
capacitor.
(4)
Aluminum Electrolytic capacitor not recommended for the TurboTrans due to higher ESR × capacitance products. Aluminum and higher
ESR capacitors can be used in conjunction with lower ESR capacitance.
(5)
Output bulk capacitor's maximum ESR is
≥ 30 m. Additional ceramic capacitance of ≥ 200 F is required.
(6)
N/R – Not recommended. The voltage rating does not meet the minimum operating limits.
Copyright 2008, Texas Instruments Incorporated
11
Product Folder Link(s): PTH08T255W
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| PTH08T260WAD | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PTH08T255WAS | 功能描述:DC/DC转换器 40A,8-14V In,3-5.25V Out,Non-Iso Pwr Mod RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PTH08T255WAST | 功能描述:DC/DC转换器 40A,8-14V In,3-5.25V Out,Non-Iso Pwr Mod RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PTH08T255WAZ | 功能描述:DC/DC转换器 40A,8-14V In,3-5.25V Out,Non-Iso Pwr Mod RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PTH08T255WAZT | 功能描述:DC/DC转换器 40A,8-14V In,3-5.25V Out,Non-Iso Pwr Mod RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PTH08T260W | 制造商:TI 制造商全称:Texas Instruments 功能描述:3-A, 4.5-V to 14-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans |
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