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參數(shù)資料
| 型號： | LTC1871EMS#PBF-1 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 24/36頁 |
| 文件大?。?/td> | 354K |
| 代理商： | LTC1871EMS#PBF-1 |
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30
LTC1871-1
18711fa
VOUT (AC)
200mV/DIV
IOUT
0.5A/DIV
Figure 19. LTC1871-1 SEPIC Converter Load Step Response
VIN = 4.5V
VOUT = 12V
VOUT (AC)
200mV/DIV
IOUT
0.5A/DIV
VIN = 15V
VOUT = 12V
50
μs/DIV
1871 F19a
50
μs/DIV
1871 F19b
APPLICATIO S I FOR ATIO
WU
UU
6. The diode for this design must handle a maximum DC
output current of 2A and be rated for a minimum
reverse voltage of VIN + VOUT, or 27V. A 3A, 40V diode
from International Rectifier (30BQ040) is chosen for its
small size, relatively low forward drop and acceptable
reverse leakage at high temp.
7. The output capacitor usually consists of a high valued
bulk C connected in parallel with a lower valued, low
ESR ceramic. Based on a maximum output ripple
voltage of 1%, or 120mV, the bulk C needs to be greater
than:
C
I
Vf
A
V
kHz
F
OUT
OUT MAX
OUT
≥
=
= μ
()
.
.
001
15
0 01 12
300
41
The RMS ripple current rating for this capacitor needs
to exceed:
II
V
A
V
A
RMS COUT
O MAX
O
IN MIN
()
(
)
()
.
≥
=
15
12
5
23
To satisfy this high RMS current demand, two 47
μF
Kemet capacitors (T495X476K020AS) are required. As
a result, the output ripple voltage is a low 50mV to
60mV. In parallel with these tantalums, two 10
μF, low
ESR (X5R) Taiyo Yuden ceramic capacitors
(TMK432BJ106MM) are added for HF noise reduction.
Check the output ripple with a single oscilloscope probe
connected directly across the output capacitor termi-
nals, where the HF switching currents flow.
8. The choice of an input capacitor for a SEPIC converter
depends on the impedance of the source supply and the
amount of input ripple the converter will safely tolerate.
For this particular design and lab setup, a single 47
μF
Kemet tantalum capacitor (T495X476K020AS) is ad-
equate. As with the output node, check the input ripple
with a single oscilloscope probe connected across the
input capacitor terminals. If any HF switching noise is
observed it is a good idea to decouple the input with a
low ESR, X5R ceramic capacitor as close to the VIN and
GND pins as possible.
9. The DC coupling capacitor in a SEPIC converter is
chosen based on its RMS current requirement and
must be rated for a minimum voltage of VIN plus the AC
ripple voltage. Start with the minimum value which
satisfies the RMS current requirement and then check
the ripple voltage to ensure that it doesn’t exceed the DC
rating.
II
VV
V
A
VV
V
A
RMS CI
O MAX
OD
IN MIN
()
(
)
()
.
≥
+
=
+
=
15
12
0 5
5
24
For this design a single 10
μF, low ESR (X5R) Taiyo
Yuden ceramic capacitor (TMK432BJ106MM) is
adequate.
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| LTC1871HMS#PBF | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC1871HMS#TRPBF | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC1871HMSPBF | 制造商:Linear Technology 功能描述:PWM Controller Current Mode MSOP10 |
| LTC1871IMS | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC1871IMS#PBF | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
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