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參數(shù)資料
| 型號： | LT1941EFE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Triple Monolithic Switching Regulator |
| 中文描述： | 6 A SWITCHING REGULATOR, 1350 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 4.40 MM, PLASTIC, TSSOP-28 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大?。?/td> | 336K |
| 代理商： | LT1941EFE |
12
LT1941
1941f
APPLICATIOU
You can estimate output ripple with the following
equations:
V
RIPPLE
=
I
L
/(8 f C
OUT
) for ceramic capacitors
and
V
RIPPLE
=
I
L
ESR for electrolytic capacitors (tantalum
and aluminum)
where
I
L
is the peak-to-peak ripple current in the induc-
tor. The RMS content of this ripple is very low so the RMS
current rating of the output capacitor is usually not of
concern. It can be estimated with the formula:
I
C(RMS)
=
I
L
/
√
12
Another constraint on the output capacitor is that it must
have greater energy storage than the inductor; if the stored
energy in the inductor transfers to the output, the resulting
voltage step should be small compared to the regulation
voltage. For a 5% overshoot, this requirement indicates:
C
OUT
> 10 L (I
LIM
/V
OUT
)
2
The low ESR and small size of ceramic capacitors make
them the preferred type for LT1941 applications. Not all
ceramic capacitors are the same, however. Many of the
higher value capacitors use poor dielectrics with high
temperature and voltage coefficients. In particular, Y5V
and Z5U types lose a large fraction of their capacitance
with applied voltage and at temperature extremes.
Because loop stability and transient response depend on
the value of C
OUT
, this loss may be unacceptable. Use X7R
and X5R types.
Electrolytic capacitors are also an option. The ESRs of
most aluminum electrolytic capacitors are too large to
deliver low output ripple. Tantalum, as well as newer,
lower-ESR organic electrolytic capacitors intended for
power supply use are suitable. Chose a capacitor with a
low enough ESR for the required output ripple. Because
the volume of the capacitor determines its ESR, both the
size and the value will be larger than a ceramic capacitor
that would give similar ripple performance. One benefit is
that the larger capacitance may give better transient re-
sponse for large changes in load current. Table 2 lists
several capacitor vendors.
W
U
U
Table 2. Low ESR Surface Mount Capacitors
VENDOR
Taiyo-Yuden
AVX
TYPE
Ceramic
Ceramic
Tantalum
Tantalum
Tantalum Organic
Aluminum Organic
Tantalum or Aluminum Organic
Aluminum Organic
Ceramic
SERIES
TPS
Kemet
T491,T494,T495
T520
A700
POSCAP
SP CAP
Sanyo
Panasonic
TDK
Diode Selection
The catch diode (D1 from Figure 2) conducts current only
during switch off time. Average forward current in normal
operation can be calculated from:
I
D(AVG)
= I
OUT
(V
IN
– V
OUT
)/V
IN
The only reason to consider a diode with a larger current
rating than necessary for nominal operation is for the
worst-case condition of shorted output. The diode current
will then increase to the typical peak switch current.
Peak reverse voltage is equal to the regulator input volt-
age. Use a diode with a reverse voltage rating greater than
the input voltage. Table 3 lists several Schottky diodes and
their manufacturers.
Table 3. Schottky Diodes
PART
NUMBER
On Semiconductor
MBRM120E
MBRM140
Diodes Inc.
B120
B130
B220
B230
International Rectifier
10BQ030
20BQ030
V
R
(V)
I
AVE
(A)
V
F
AT 1A
(mV)
V
F
AT 2A
(mV)
20
40
1
1
530
550
595
20
30
20
30
1
1
2
2
500
500
500
500
30
30
1
2
420
470
470
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| LT1941EFE#PBF | 功能描述:IC REG MULTI CONFIG TRPL 28TSSOP 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:- 產(chǎn)品培訓模塊:MIC23xxx HyperLight Load™ Regulators 標準包裝:5,000 系列:HyperLight Load® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.8V 輸入電壓:2.7 V ~ 5.5 V PWM 型:混合物 頻率 - 開關(guān):4MHz 電流 - 輸出:2A 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤，8-MLF? 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-MLF?（2x2） 產(chǎn)品目錄頁面:1094 (CN2011-ZH PDF) 其它名稱:576-3303-2 |
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