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| 型号： | PTH08T240WAZ |
| 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 PACKAGE-11 |
| 文件页数： | 7/39页 |
| 文件大小： | 1366K |
| 代理商： | PTH08T240WAZ |
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Designing for Fast Load Transients
www.ti.com ................................................................................................................................................... SLTS264J – 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. Input/Output Capacitors(1)
Capacitor Characteristics
Quantity
Max
Output Bus
Max.
Ripple
Capacitor Vendor,
Working
ESR
Current
Turbo-
Value
Physical
Input
Type Series (Style)
No
Voltage
at 100
at
Vendor Part No.
Trans
(F)
Size (mm)
Bus
Turbo-
(V)
kHz
85°C
(Cap
Trans
(m
)
(Irms)
Type)(2)
(mA)
Panasonic
FC (Radial)
25
270
90
755
10 × 12,5
≥1(3)
≥ 1(4)
N/R(5)
EEUFC1E271
FC (Radial)
25
560
65
1205
12,5 × 15
≥1(3)
≥ 1(4)
N/R(5)
EEUFC1E561S
FC(SMD)
25
470
65
1200
12,5 × 16,5
≥1(3)
≥ 1(4)
N/R(5)
EEVFC1E471LQ
FK(SMD)
25
470
80
850
10 ×10,2
≥1(3)
≥ 1(4)
N/R(5)
EEVFK1E471P
United Chemi-Con
PTB(SMD) Poly-Tantalum
6.3
330
25
2600
7,3x4,3x2.8
N/R(6)
1 ~ 4(4)
C
≥ 2(2)
4PTB337MD6TER (VO≤ 5.1V)
(7)
LXZ, Aluminum (Radial)
25
330
90
760
10 × 12,5
≥1(3)
≥ 1 (4)
N/R(5)
LXZ25VB331M10X12LL
PS, Poly-Alum(Radial)
16
330
14
5060
10 × 12,5
≥1(3)
1 ~ 3
B
≥ 2(2)
16PS330MJ12
PXA, Poly-Alum(SMD)
16
330
14
5050
10 × 12,2
≥1(3)
1 ~ 3
B
≥ 2(2)
PXA16VC331MJ12TP
PS, Poly-Alum(Radial)
10
270
14
4420
8 × 11,5
N/R(6)
1 ~ 2
B
≥ 2(2)
10PS270MH11
PXA, Poly-Alum(Radial)
10
330
14
4420
8 × 12
N/R(6)
1 ~ 2
B
≥ 2(2)
PXA10VC331MH12
Nichicon, Aluminum
HD (Radial)
25
220
72
760
8 × 11,5
≥1(3)
≥ 1(4)
N/R(5)
UHD1E221MPR
PM (Radial)
25
330
95
750
10 × 15
≥1(3)
≥ 1(4)
N/R(5)
UPM1E331MPH6
PM (Radial)
35
560
48
1360
16 × 15
≥1(3)
≥ 2(4)
N/R(5)
UPM1V561MHH6
Panasonic, Poly-Aluminum
2.0
390
5
4000
7,3×4,3×4,2
N/R(6)
B
≥ 2(2)
EEFSE0J391R (VO≤ 1.6V)
(8)
(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)
In addition to the required input electrolytic capacitance,
≥ 20
F of ceramic capacitance is required to reduce the high-frequency
reflected ripple current.
(4)
Total bulk nonceramic capacitors on the output bus with ESR of
≥ 15m to ≤ 30m requires an additional ≥ 200
F of ceramic
capacitance.
(5)
Aluminum Electrolytic capacitor not recommended for the TurboTrans due to higher capacitance × ESR products. Aluminum and higher
ESR capacitors can be used in conjunction with lower ESR capacitance.
(6)
N/R – Not recommended. The voltage rating does not meet the minimum operating limits.
(7)
The voltage rating and derating of this capacitor only allows it to be used for voltages that are equal or less than 5.1 V.
(8)
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): PTH08T240W PTH08T241W
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| PTH08T240WAH | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| PTH08T240WAZT | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| PTH08T250WAST | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| PTH08T250WAD | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| PTH08T250WAS | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| PTH08T240WAZ | 制造商:Texas Instruments 功能描述:DC/DC Converter |
| PTH08T240WAZT | 功能描述:DC/DC转换器 10A 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: |
| PTH08T241W | 制造商:TI 制造商全称:Texas Instruments 功能描述:10-A, 4.5-V to 14-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS |
| PTH08T241WAD | 功能描述:DC/DC转换器 10A 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: |
| PTH08T241WAS | 功能描述:DC/DC转换器 10A 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: |
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