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參數(shù)資料
| 型號(hào)： | LT1959C |
| 廠(chǎng)商： | Linear Technology Corporation |
| 元件分類(lèi)： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開(kāi)關(guān)穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 11/24頁(yè) |
| 文件大小： | 292K |
| 代理商： | LT1959C |
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11
LT1959
APPLICATIO
S I
FOR
ATIO
U
W
U
U
Table 2
SERIES
RESIS-
TANCE(
)
CORE
MATER-
IAL
VENDOR/
PART NO.
Coiltronics
CTX2-1
CTX5-4
CTX8-4
CTX2-1P
CTX2-3P
CTX5-4P
Sumida
CDRH125
CDRH125
CDRH125
CDRH125
Coilcraft
DT3316-222
DT3316-332
DT3316-472
Pulse
PE-53650
PE-53651
PE-53652
PE-53653
Dale
IHSM-4825
IHSM-4825
IHSM-5832
IHSM-5832
IHSM-7832
Tor = Toroid
SC = Semiclosed geometry
Fer = Ferrite core material
52 = Type 52 powdered iron core material
KM
μ
= Kool M
μ
VALUE
(
μ
H)
DC
CORE
TYPE
HEIGHT
(mm)
(Amps)
2
5
8
2
2
5
4.1
4.4
3.5
3.4
4.6
3.3
Tor
Tor
Tor
Tor
Tor
Tor
0.011
0.019
0.020
0.014
0.012
0.027
KM
μ
KM
μ
KM
μ
52
52
52
4.2
6.4
6.4
4.2
4.8
6.4
10
12
15
18
4.0
3.5
3.3
3.0
SC
SC
SC
SC
0.025
0.027
0.030
0.034
Fer
Fer
Fer
Fer
6
6
6
6
2.2
3.3
4.7
5
5
3
SC
SC
SC
0.035
0.040
0.045
Fer
Fer
Fer
5.1
5.1
5.1
4
5
9
4.8
5.4
5.5
5.1
Tor
Tor
Tor
Tor
0.017
0.018
0.022
0.032
52
52
52
52
9.1
9.1
10
10
16
2.7
4.7
10
15
22
5.1
4.0
4.3
3.5
3.8
Open
Open
Open
Open
Open
0.034
0.047
0.053
0.078
0.054
Fer
Fer
Fer
Fer
Fer
5.6
5.6
7.1
7.1
7.1
Output Capacitor
The output capacitor is normally chosen by its Effective
Series Resistance (ESR), because this is what determines
output ripple voltage. At 500kHz, any polarized capacitor
is essentially resistive. To get low ESR takes volume so
physically smaller capacitors have high ESR. The ESR
range for typical LT1959 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:
Output Capacitor Ripple Current (RMS):
(
( )( )( )
I
V
V
V
L f V
RIPPLE RMS
OUT
IN
OUT
IN
)
=
)
(
)
0 29
Kool M
μ
is a registered trademark of Magnetics, Inc.
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