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| 型號(hào)： | LTC1871IMS-1 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁(yè)數(shù)： | 24/36頁(yè) |
| 文件大小： | 523K |
| 代理商： | LTC1871IMS-1 |
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LTC1871-1
30
18711fb
APPLICATIONS INFORMATION
Figure 19. LTC1871-1 SEPIC Converter Load Step Response
VOUT (AC)
200mV/DIV
IOUT
0.5A/DIV
50μs/DIV
18711 F19
VIN = 15V
VOUT = 12V
VOUT (AC)
200mV/DIV
IOUT
0.5A/DIV
50μs/DIV
VIN = 4.5V
VOUT = 12V
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 Rectier (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:
COUT
IOUT(MAX)
0.01 VOUT f
=
1.5A
0.01 12V 300kHz
= 41μF
The RMS ripple current rating for this capacitor needs
to exceed:
IRMS(COUT) IO(MAX)
VO
VIN(MIN)
=
1.5A
12V
5V
= 2.3A
To satisfy this high RMS current demand, two 47μF
Kemet capacitors (T495X476K020AS) are required. As a
result, the output ripple voltage is a low 50mV to 60mV.
In parallel with these tantalums, two 10μF, 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 terminals, where the HF
switching currents ow.
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 toler-
ate. For this particular design and lab setup, a single
47μF Kemet tantalum capacitor (T495X476K020AS) is
adequate. 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 cho-
sen 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 satises
the RMS current requirement and then check the ripple
voltage to ensure that it doesn’t exceed the DC rating.
IRMS(CI) IO(MAX)
VO + VD
VIN(MIN)
= 1.5A
12V
+ 0.5V
5V
= 2.4A
For this design a single 10μF, low ESR (X5R) Taiyo
Yuden ceramic capacitor (TMK432BJ106MM) is
adequate.
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