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參數資料
| 型號： | NCP1523 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 6-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans |
| 中文描述： | 6甲，2.2 V至5.5 V輸入，非隔離，寬輸出，可調電源模塊的TurboTrans |
| 文件頁數： | 15/35頁 |
| 文件大小： | 1128K |
| 代理商： | NCP1523 |
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Designing for Fast Load Transients
PTH04T230W, PTH04T231W
SLTS271A–SEPTEMBER 2006–REVISED OCTOBER 2006
The transient response of the dc/dc converter has been characterized using a load transient with a di/dt of
2.5 A/
μ
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 100 A/
μ
s, adding
multiple 10-
μ
F ceramic capacitors plus 10
×
1
μ
F, and numerous high frequency ceramics (
≤
0.1
μ
F) 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
Ripple
Current
at 85
°
C
(Irms)
(mA)
Output Bus
(2)
Max
ESR
at 100
kHz
(m
)
Capacitor Vendor,
Type Series (Style)
Working
Voltage
(V)
Turbo-
Trans
Capacitor
Type
(3)
Value
(
μ
F)
Physical
Size (mm)
Input
Bus
No
Vendor Part No.
Turbo-
Trans
Panasonic
SP series (UE)
6.3
220
15
3000
7,3
×
4,3
8 X 11,5
2
1
≤
2
≥
1
≥
1
B
≥
1
(3)
N/R
(4)
EEFUE0J221R
FC (Radial )
6.3
390
117
555
1
EEUFC0J391
FK (SMD)
6.3
470
160
600
10 X 10,2
1
N/R
(4)
EEVFK0J471P
United Chemi-Con
PTB, Poly-Tantalum(SMD)
6.3
330
25
2600
7,3
×
4,3
×
2,8
8 X 12
1
1
≤
3
1
C
≥
2
(3)
N/R
(4)
6PTB337MD6TER
LXZ, Aluminum (Radial)
6.3
680
120
555
1
LXZ6.3VB681M8X12LL
PS, Poly-Alum (Radial)
6.3
390
12
4770
8 X 11,5
1
≤
1
1
B
≥
2
(3)
N/R
(4)
6PS390MH11
PT Poly-Tantalum (SMD)
6.3
330
40
3000
7,3
×
4,3
10
×
10
8
×
12,2
1
6PT337MD8TER
MVY, Aluminum SMD)
10
680
150
670
1
1
B
≥
2
(3)
B
≥
1
(3)
MVY10VC681MJ10TP
PXA, Poly-Alum (Radial)
10 V
330
14
4420
1
1
≤
2
PXA10VC331MH12
Nichicon, Aluminum
WG (SMD)
10
470
150
670
10
×
10
8 X 11,5
1
1
N/R
(4)
UWG1A471MNR1GS
HD (Radial)
10
470
72
760
1
1
N/R
(4)
UHD1A471MPR
Panasonic, Poly-Aluminum
SE Series (SMD)
2.0
560
5
4000
7,3
×
4,3
×
4,2
N/R
(5)
N/R
(6)
B
≥
2
(3)
EEFSE0J561R(V
O
≤
1.6V)
(7)
(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.
Additional output capacitance must include the required 100
μ
F of ceramic type.
Required capacitors with TurboTrans. See the TurboTrans Application information for Capacitor Selection
Capacitor Types:
Type A = (100 < capacitance
×
ESR
≤
1000)
Type B = (1,000 < capacitance
×
ESR
≤
5,000)
Type C = (5,000 < capacitance
×
ESR
≤
10,000)
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.
N/R – Not recommended. The voltage rating does not meet the minimum operating limits.
N/R – Not recommended. The ESR value of this capacitor is below the required minimum when not using TurboTrans.
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.
(2)
(3)
(4)
(5)
(6)
(7)
15
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