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参数资料
| 型号： | LT1576IS8#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3.5 A SWITCHING REGULATOR, 240 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, SOP-8 |
| 文件页数： | 4/28页 |
| 文件大小： | 290K |
| 代理商： | LT1576IS8#TR |
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12
LT1576/LT1576-5
APPLICATIONS INFORMATION
WU
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.
Table 2
SERIES
CORE
VENDOR/
VALUE
DC
CORE
RESIS-
MATER- HEIGHT
PART NO.
(
H) (Amps) TYPE TANCE()
IAL
(mm)
Coiltronics
CTX15-2
15
1.7
Tor
0.059
KM
6.0
CTX33-2
33
1.4
Tor
0.106
KM
6.0
CTX68-4
68
1.2
Tor
0.158
KM
6.4
CTX15-1P
15
1.4
Tor
0.087
52
4.2
CTX33-2P
33
1.3
Tor
0.126
52
6.0
CTX68-4P
68
1.1
Tor
0.238
52
6.4
Sumida
CDRH74-150
15
1.47
SC
0.081
Fer
4.5
CDH115-330
33
1.68
SC
0.082
Fer
5.2
CDRH125-680
68
1.5
SC
0.12
Fer
6
CDH74-330
33
1.45
SC
0.17
Fer
5.2
Coilcraft
DO3308P-153
15
2
SC
0.12
Fer
3
DO3316P-333
33
2
SC
0.1
Fer
5.21
DO3316P-683
68
1.4
SC
0.18
Fer
5.21
Pulse
PE-53602
35
1.4
Tor
0.166
Fer
9.1
PE-53604
73
1.3
Tor
0.290
Fer
9.1
PE-53632
22
2.7
Tor
0.063
Fer
9.1
PE-53633
40
2.7
Tor
0.085
Fer
10
Gowanda
SMP3316-152K
15
3.5
SC
0.041
Fer
6
SMP3316-332K
33
2.3
SC
0.092
Fer
6
SMP3316-682K
68
1.7
SC
0.178
Fer
6
Tor = Toroid
SC = Semi-closed geometry
Fer = Ferrite core material
52 = Type 52 powdered iron core material
KM
= Kool M
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
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
F to greater than 500F work well, but you cannot
cheat mother nature on ESR. If you find a tiny 22
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
ESR (Max.,
)
Ripple Current (A)
AVX TPS, Sprague 593D
0.1 to 0.3
0.7 to 1.1
AVX TAJ
0.7 to 0.9
0.4
D Case Size
AVX TPS, Sprague 593D
0.1 to 0.3
0.7 to 1.1
C Case Size
AVX TPS
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
output capacitor. Solid
tantalum capacitors fail during very high
turn-on surges,
which do not occur at the output of regulators. High
discharge surges, 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 200mARMS. The formula
to calculate this is:
相关PDF资料 |
PDF描述 |
|---|---|
| LT1634CMS8-2.5#PBF | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 2.5 V, PDSO8 |
| LT1634CMS8-1.25#PBF | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.25 V, PDSO8 |
| LT1634CMS8-1.25#TRPBF | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.25 V, PDSO8 |
| LT1680ISW#TRPBF | SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO16 |
| LT1702-7FB1 | 1-OUTPUT 500 W AC-DC REG PWR SUPPLY MODULE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1577 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Ultrafast Transient Response, Low Dropout Regulators Adjustable and Fixed |
| LT1577CS-3.3/2.8 | 功能描述:IC REG CTRLR DUAL OUT 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性晶体管驱动器 系列:- 产品培训模块:More Information on LDOs 标准包装:2,500 系列:- 类型:正，固定式 输出数:2 输出电压:2.8V，3.3V 电流 - 电源:12mA 输入电压:5 V ~ 22 V 工作温度:0°C ~ 70°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| LT1577CS-3.3/2.8#PBF | 功能描述:IC REG CTRLR DUAL OUT 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性晶体管驱动器 系列:- 产品培训模块:More Information on LDOs 标准包装:2,500 系列:- 类型:正，固定式 输出数:2 输出电压:2.8V，3.3V 电流 - 电源:12mA 输入电压:5 V ~ 22 V 工作温度:0°C ~ 70°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| LT1577CS-3.3/2.8#TR | 功能描述:IC REG CTRLR DUAL OUT 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性晶体管驱动器 系列:- 产品培训模块:More Information on LDOs 标准包装:2,500 系列:- 类型:正，固定式 输出数:2 输出电压:2.8V，3.3V 电流 - 电源:12mA 输入电压:5 V ~ 22 V 工作温度:0°C ~ 70°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| LT1577CS-3.3/2.8#TRPBF | 功能描述:IC REG CTRLR DUAL OUT 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性晶体管驱动器 系列:- 产品培训模块:More Information on LDOs 标准包装:2,500 系列:- 类型:正，固定式 输出数:2 输出电压:2.8V，3.3V 电流 - 电源:12mA 输入电压:5 V ~ 22 V 工作温度:0°C ~ 70°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
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