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參數(shù)資料
| 型號： | LT1507IS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 3 A SWITCHING REGULATOR, 570 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 343K |
| 代理商： | LT1507IS8 |
10
LT1507
APPLICATIO
S I
FOR
ATIO
U
be due to a radiated magnetic field coupling into PC
board traces. But why were some boards bad and
others good In a moment of desperation (or divine
inspiration) I unsoldered a “bad” inductor, rotated it
180
°
and resoldered it. Problem fixed!!
It turns out that the inductor was symmetrical in all
regards except that the polarity of the magnetic field
reversed when the unit was rotated 180
°
because
current flowed in the opposite direction in the coil. In
one direction, the magnetically induced ripple in the
board traces added o output ripple. Rotating the induc-
tor caused the induced field to reduce output ripple.
Unfortunately the inductor had no physical package
assymmetry to indicate rotation, including part mark-
ing, so we had to visually examine the winding in each
unit before soldering it to the boards. This little horror
story should not preclude the use of open core induc-
tors, but it emphasizes the need to carefully check the
effect these seductively small, low cost inductors may
have on regulator or system performances.
4. Look for an inductor (see Table 1) which meets the
requirements of core shape, peak current (to avoid
saturation), average current (to limit heat) and fault
current (if the inductor gets too hot, wire insulation will
melt and cause turn-to-turn shorts). Keep in mind that
all good things like high efficiency, surface mounting,
low profile and high temperature operation will increase
cost, sometimes dramatically.
5. After making an initial choice, consider secondary things
like output voltage ripple, second sourcing, etc. Use the
experts in the Linear Technology Applications Depart-
ment if you feel uncertain about the final choice. They
have experience with a wide range of inductor types and
can tell you about the latest developments in low profile,
surface mounting, etc.
W
U
U
Table 1. Representative Surface Mount Units
VALUE
MANUFACTURER
(
μ
H)
Coiltronics
CTX5-1
5
CTX10-1
10
CTX5-1P
5
CTX10-1P
10
Sumida
CDRH64
10
CDRH73
10
CD73
10
CD104
10
Gowanda
SM20-102K
10
Dale
IHSM-4825
10
IHSM-5832
10
DC
(A)
CORE SERIES
TYPE
HEIGHT
(mm)
(
)
CORE
2.3
1.9
1.8
1.6
Tor
Tor
Tor
Tor
0.027
0.039
0.021
0.030
KM
μ
KM
μ
52
52
4.2
4.2
4.2
4.2
1.7
1.7
1.4
2.4
SC
SC
Open
Open
0.084
0.055
0.062
0.041
Fer
Fer
Fer
Fer
4.5
3.4
3.5
4.0
1.3
Open
0.038
Fer
7
3.1
4.3
Open
Open
0.071
0.053
Fer
Fer
5.6
7.1
SC = Semi-closed geometry
Fer = Ferrite core material
52 = Type 52 powdered iron core material
KM
μ
= Kool M
μ
OUTPUT CAPACITOR
The output capacitor is normally chosen by its effective
series resistance (ESR), because that is what determines
output ripple voltage. At 500kHz any polarized capacitor is
essentially resistive. To get low ESR takes volume; physi-
cally larger capacitors have lower ESR. The ESR range
needed for typical LT1507 applications is 0.05
to 0.5
.
A typical output capacitor is an AVX type TPS, 100
μ
F at
10V, with a guaranteed ESR less than 0.1
. This is a “D”
size surface mount solid tantalum capacitor. TPS capaci-
tors are specially constructed and tested for low ESR so
they give the lowest ESR for a given volume. The value in
microfarads is not particularly critical and values from
22
μ
F to greater than 500
μ
F work well, but you cannot
cheat mother nature on ESR. If you find a tiny 22
μ
F solid
tantalum capacitor, it will have high ESR and output ripple
voltage will be terrible. The chart in Table 2 shows some
typical solid tantalum surface mount capacitors.
相關PDF資料 |
PDF描述 |
|---|---|
| LT1507C | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1507CN8 | Octal D-Type Edge-Triggered Flip-Flops With 3-State Outputs 24-SOIC 0 to 70 |
| LT1507CN8-3.3 | Octal D-Type Edge-Triggered Flip-Flops With 3-State Outputs 24-SOIC 0 to 70 |
| LT1507CS8 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1507CS8-3.3 | Octal D-Type Edge-Triggered Flip-Flops With 3-State Outputs 24-SO 0 to 70 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT1507IS8#PBF | 功能描述:IC REG BUCK ADJ 1.5A 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 設計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應商設備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT1507IS8#TR | 功能描述:IC REG BUCK ADJ 1.5A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 設計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應商設備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT1507IS8#TRPBF | 功能描述:IC REG BUCK ADJ 1.5A 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 設計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應商設備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT1507IS8-3.3 | 功能描述:IC REG BUCK 3.3V 1.5A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 設計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應商設備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT1507IS8-3.3#PBF | 功能描述:IC REG BUCK 3.3V 1.5A 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 設計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應商設備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
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