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參數資料
| 型號： | LM10506TMX-A |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA34 |
| 封裝： | 0.40 MM PITCH, MICRO SMD-34 |
| 文件頁數： | 21/34頁 |
| 文件大小： | 1020K |
| 代理商： | LM10506TMX-A |
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21.0 External Components
Selection
All three switchers require an input capacitor and an output
inductor-capacitor filter. These components are critical to the
performance of the device. All three switchers are internally
compensated and do not require external components to
achieve stable operation. The output voltages of the bucks
can be programmed through the SPI pins.
21.1 OUTPUT INDUCTORS & CAPACITORS SELECTION
There are several design considerations related to the selec-
tion of output inductors and capacitors:
Load transient response
Stability
Efficiency
Output ripple voltage
Over current ruggedness
The device has been optimized for use with nominal LC val-
ues as shown in the Typical Application Circuit (page 1).
21.2 INDUCTOR SELECTION
The recommended inductor values are shown in Section 5.0
Typical Application Diagram. It is important to guarantee the
inductor core does not saturate during any foreseeable oper-
ational situation. The inductor should be rated to handle the
peak load current plus the ripple current:
Care should be taken when reviewing the different saturation
current ratings that are specified by different manufacturers.
Saturation current ratings are typically specified at 25°C, so
ratings at maximum ambient temperature of the application
should be requested from the manufacturer.
There are two methods to choose the inductor saturation cur-
rent rating:
21.2.1 Recommended Method for Inductor Selection:
The best way to guarantee the inductor does not saturate is
to choose an inductor that has saturation current rating
greater than the maximum device current limit, as specified
in the Electrical Characteristics tables. In this case the device
will prevent inductor saturation by going into current limit be-
fore the saturation level is reached.
21.2.2 Alternate Method for Inductor Selection:
If the recommended approach cannot be used care must be
taken to guarantee that the saturation current is greater than
the peak inductor current:
I
SAT:
Inductor saturation current at operating tempera-
ture
I
LPEAK:
Peak inductor current during worst case conditions
I
OUTMAX:
Maximum average inductor current
I
RIPPLE:
Peak-to-Peak inductor current
V
OUT:
Output voltage
V
IN:
Input voltage
L:
Inductor value in Henries at I
OUTMAX
F:
Switching frequency, Hertz
D:
Estimated duty factor
EFF:
Estimated power supply efficiency
I
SAT may not be exceeded during any operation, including
transients, startup, high temperature, worst-case conditions,
etc.
21.2.2.1 Suggested Inductors and Their Suppliers
The designer should choose the inductors that best match the
system requirements. A very wide range of inductors are
available as regarding physical size, height, maximum current
(thermally limited, and inductance loss limited), series resis-
tance, maximum operating frequency, losses, etc. In general,
smaller physical size inductors will have higher series resis-
tance (DCR) and implicitly lower overall efficiency is
achieved. Very low-profile inductors may have even higher
series resistance. The designer should try to find the best
compromise between system performance and cost.
TABLE 3. Recommended Inductors
Value
Manufacturer
Part Number
DCR
Current
Package
2.2 H
Murata
LQH55PN2R2NR0L
31 m
2.5A
2220
2.2 H
TDK
NLC565050T-2R2K-PF
60 m
1.3A
2220
2.2 H
Murata
LQM2MPN2R2NG0
110 m
1.2A
806
www.national.com
28
LM10506
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| LM10506TMX-A/NOPB | 功能描述:直流/直流開關轉換器 Triple Buck & LDO Power Mgmt Unit RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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| LM10520 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:20A Adaptive Voltage Scaling (AVS) Evaluation Board |
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