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| 型号： | PTH08T220WAZ |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, PLASTIC, DIP-11 |
| 文件页数： | 7/38页 |
| 文件大小： | 1290K |
| 代理商： | PTH08T220WAZ |
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Designing for Fast Load Transients
Capacitor Table
www.ti.com................................................................................................................................................... SLTS252K – NOVEMBER 2005 – REVISED JUNE 2009
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 10
F 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.
Capacitor Vendor,
Ripple
Working
Value
ESR
Physical
Input
Type Series (Style)
No
Turbo-
Current
Vendor Part No.
Voltage
(F)
at 100
Size (mm)
Bus
Turbo-
Trans
at 85°C
kHz
Trans
Cap Type(2)
(Irms)
Panasonic
FC (Radial)
25 V
1000
43m
1690mA
16 × 15
1
≥ 2(3)
N/R(4)
EEUFC1E102S
FC (Radial)
25 V
820
38m
1655mA
12 × 20
1
≥ 1(3)
N/R(4)
EEUFC1E821S
FC (SMD)
35 V
470
43m
1690mA
16 × 16,5
1
≥ 1(3)
N/R(4)
EEVFC1V471N
FK (SMD)
35 V
1000
35m
1800mA
16 ×16,5
1
≥ 2(3)
N/R(4)
EEVFK1V102M
United Chemi-Con
PTB, Poly-Tantalum(SMD)
6.3 V
330
25m
2600mA
7,3×4,3×2.8
N/R(5)
1 ~ 4(3)
C
≥ 2(2)
6PTB337MD6TER (VO≤ 5.1V)
(6)
LXZ, Aluminum (Radial)
35 V
680
38m
1660mA
12,5 × 20
1
1 ~ 3(3)
N/R(4)
LXZ35VB681M12X20LL
PS, Poly-Alum (Radial)
16 V
330
14m
5060mA
10 × 12,5
1
1 ~ 3
B
≥ 2(2)
16PS330MJ12
PS, Poly-Alum (Radial)
6.3 V
390
12m
5500mA
8 × 12,5
N/R(5)
1 ~ 2
B
≥ 1(2)
6PS390MH11 (VO≤ 5.1V)
(6)
PXA, Poly-Alum (SMD)
16 V
330
14m
5050mA
10 × 12,2
1
1 ~ 3
B
≥ 2(2)
PXA16VC331MJ12TP
PXA, Poly-Alum (Radial)
10 V
330
14m
4420mA
8 × 12,2
N/R(5)
1 ~ 2
B
≥ 1(2)
PXA10VC331MH12
(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.
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 TurboTrans Application information for Capacitor Selection
Capacitor Types:
a. Type A = (100 < capacitance × ESR
≤ 1000)
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
≥ 15m to ≤ 30m requires an additional 200
F of ceramic capacitance.
(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)
N/R – Not recommended. The voltage rating does not meet the minimum operating limits.
(6)
The voltage rating of this capacitor only allows it to be used for output voltage that is equal to or less than 80% of the working voltage.
Copyright 2005–2009, Texas Instruments Incorporated
15
Product Folder Link(s): PTH08T220W PTH08T221W
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| PTH08T221WAS | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| PTH08T221WAST | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| PTH08T221WAZT | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| PTH08T220WAST | 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 |
|---|---|
| PTH08T220WAZ | 制造商:Texas Instruments 功能描述:DC/DC Converter (DC-DC) / Switching Regu |
| PTH08T220WAZT | 功能描述:DC/DC转换器 16A 4.5-14V-Input Wide-Out Adj Pwr Mdl 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: |
| PTH08T221W | 制造商:TI 制造商全称:Texas Instruments 功能描述:16-A, 4.5-V to 14-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans |
| PTH08T221WAD | 功能描述:DC/DC转换器 16A 4.5V to 14V Inp Ceramic Cap Version 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: |
| PTH08T221WAD | 制造商:Texas Instruments 功能描述:Power Module |
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