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參數(shù)資料
| 型號(hào)： | LT1576 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 1.5A, 200kHz Step-Down Switching Regulator(可調(diào)輸出，1.5A, 200kHz，步降開關(guān)穩(wěn)壓器) |
| 中文描述： | 1.5A的，200kHz降壓型開關(guān)穩(wěn)壓器（可調(diào)輸出，1.5A的，200kHz的，步降開關(guān)穩(wěn)壓器） |
| 文件頁數(shù)： | 12/28頁 |
| 文件大?。?/td> | 290K |
| 代理商： | LT1576 |
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12
LT1576/LT1576-5
APPLICATIO
S I
FOR
ATIO
U
5. After making an initial choice, consider the secondary
things like output voltage ripple, second sourcing, etc.
Use the experts in the Linear Technology’s applica-
tions department 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 devel-
opments in low profile, surface mounting, etc.
W
U
U
Table 2
SERIES
RESIS-
CORE
MATER- HEIGHT
IAL
VENDOR/
PART NO.
Coiltronics
CTX15-2
CTX33-2
CTX68-4
CTX15-1P
CTX33-2P
CTX68-4P
Sumida
CDRH74-150
CDH115-330
CDRH125-680
CDH74-330
Coilcraft
DO3308P-153
DO3316P-333
DO3316P-683
Pulse
PE-53602
PE-53604
PE-53632
PE-53633
Gowanda
SMP3316-152K
SMP3316-332K
SMP3316-682K
Tor = Toroid
SC = Semi-closed geometry
Fer = Ferrite core material
52 = Type 52 powdered iron core material
KM
μ
= Kool M
μ
VALUE
(
μ
H)
DC
CORE
TYPE TANCE(
)
(Amps)
(mm)
15
33
68
15
33
68
1.7
1.4
1.2
1.4
1.3
1.1
Tor
Tor
Tor
Tor
Tor
Tor
0.059
0.106
0.158
0.087
0.126
0.238
KM
μ
KM
μ
KM
μ
52
52
52
6.0
6.0
6.4
4.2
6.0
6.4
15
33
68
33
1.47
1.68
1.5
1.45
SC
SC
SC
SC
0.081
0.082
0.12
0.17
Fer
Fer
Fer
Fer
4.5
5.2
6
5.2
15
33
68
2
2
SC
SC
SC
0.12
0.1
0.18
Fer
Fer
Fer
3
5.21
5.21
1.4
35
73
22
40
1.4
1.3
2.7
2.7
Tor
Tor
Tor
Tor
0.166
0.290
0.063
0.085
Fer
Fer
Fer
Fer
9.1
9.1
9.1
10
15
33
68
3.5
2.3
1.7
SC
SC
SC
0.041
0.092
0.178
Fer
Fer
Fer
6
6
6
Output Capacitor
The output capacitor is normally chosen by its Effective
Series Resistance (ESR), because this is what determines
output ripple voltage. To get low ESR takes volume so
physically smaller capacitors have high ESR. The ESR
range for typical LT1576 applications is 0.05
to 0.2
. 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 capacitors
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. Table 3 shows some typical solid
tantalum surface mount capacitors.
Table 3. Surface Mount Solid Tantalum Capacitor ESR
and Ripple Current
E Case Size
AVX TPS, Sprague 593D
AVX TAJ
D Case Size
AVX TPS, Sprague 593D
C Case Size
AVX TPS
ESR (Max.,
)
0.1 to 0.3
0.7 to 0.9
Ripple Current (A)
0.7 to 1.1
0.4
0.1 to 0.3
0.7 to 1.1
0.2 (typ)
0.5 (typ)
Many engineers have heard that solid tantalum capacitors
are prone to failure if they undergo high surge currents.
This is historically true, and type TPS capacitors are
specially tested for surge capability, but surge ruggedness
is not a critical issue with the outputcapacitor. Solid
tantalum capacitors fail during very high turn-onsurges,
which do not occur at the output of regulators. High
dischargesurges, such as when the regulator output is
dead shorted, do not harm the capacitors.
Unlike the input capacitor, RMS ripple current in the
output capacitor is normally low enough that ripple cur-
rent rating is not an issue. The current waveform is
triangular with a typical value of 200mA
RMS
. The formula
to calculate this is:
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1578-2.5 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1578IS8 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1578IS8-2.5 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1578C | CAP 22UF 50V ELECT TG SMD |
| LT1578CS8 | CAP 47UF 50V ELECT TG SMD |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT-1576-111-012 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
| LT1576-5 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.5A, 200kHz Step-Down Switching Regulator |
| LT1576C | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.5A, 200kHz Step-Down Switching Regulator |
| LT1576CS8 | 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(guān)穩(wěn)壓器 系列:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)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(guān):- 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(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT1576CS8#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(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 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:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
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