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參數(shù)資料
| 型號： | LTC1530CS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Isolated Flyback Switching Regulator with 9V Output |
| 中文描述： | SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大小： | 288K |
| 代理商： | LTC1530CS8 |
14
LTC1530
The output capacitor in a buck converter under steady
state conditions sees much less ripple current than the
input capacitor. Peak-to-peak current is equal to inductor
ripple current, usually 10% to 40% of the total load
current. Output capacitor duty places a premium not on
power dissipation but on ESR. During an output load
transient, the output capacitor must supply all of the
additional load current demanded by the load until the
LTC1530 adjusts the inductor current to the new value.
ESR in the output capacitor results in a step in the output
voltage equal to the ESR value multiplied by the change in
load current. An 11A load step with a 0.05
ESR output
capacitor results in a 550mV output voltage shift; this is
19.6% of the output voltage for a 2.8V supply! Because of
the strong relationship between output capacitor ESR and
output load transient response, choose the output capaci-
tor for ESR, not for capacitance value. A capacitor with
suitable ESR will usually have a larger capacitance value
than is needed to control steady-state output ripple.
Electrolytic capacitors rated for use in switching power
supplies with specified ripple current ratings and ESR can
be used effectively in LTC1530 applications. OS-CON
electrolytic capacitors from Sanyo and other manufactur-
ers give excellent performance and have a very high
performance/size ratio for electrolytic capacitors. Surface
mount applications can use either electrolytic or dry
tantalum capacitors. Tantalum capacitors must be surge
tested and specified for use in switching power supplies.
Low cost, generic tantalums are known to have very short
lives followed by explosive deaths in switching power
supply applications. AVX TPS series surface mount
devices are popular surge tested tantalum capacitors that
work well in LTC1530 applications.
A common way to lower ESR and raise ripple current
capability is to parallel several capacitors. A typical LTC1530
application might exhibit 5A input ripple current. Sanyo
OS-CON capacitors, part number 10SA220M (220
μ
F/
10V), feature 2.3A allowable ripple current at 85
°
C; three
in parallel at the input (to withstand the input ripple
current) meet the above requirements. Similarly, AVX
TPSE337M006R0100 (330
μ
F/6V) capacitors have a rated
maximum ESR of 0.1
; seven in parallel lower the net
output capacitor ESR to 0.014
. For low cost applica-
tions, the Sanyo MV-GX capacitor series can be used with
acceptable performance.
Feedback Loop Compensation
The LTC1530 voltage feedback loop is compensated at the
COMP pin, which is the output node of the g
m
error
amplifier. The feedback loop is generally compensated
with an RC + C network from COMP to GND as shown in
Figure 8a.
Loop stability is affected by the values of the inductor, the
output capacitor, the output capacitor ESR, the error
amplifier transconductance and the error amplifier com-
pensation network. The inductor and the output capacitor
create a double pole at the frequency:
f
L C
LC
OUT
=
(
)
1
2
π
The ESR of the output capacitor and the output capacitor
value form a zero at the frequency:
f
ESR C
ESR
OUT
=
( )(
)(
)
1
2
π
The compensation network used with the error amplifier
must provide enough phase margin at the 0dB crossover
frequency for the overall open-loop transfer function. The
zero and pole from the compensation network are:
f
R
C
and f
R
C
Z
C
C
P
C
=
( )( )( )
=
( )( )( )
1
2
1
2
1
π
π
respectively. Figure 8b shows the Bode plot of the overall
transfer function.
The compensation values used in this design are based on
the following criteria, f
SW
= 12f
CO
, f
Z
= f
LC
, f
P
= 5f
CO
. At the
closed-loop frequency f
CO
, the attenuation due to the LC
filter and the input resistor divider is compensated by the
gain of the PWM modulator and the gain of the error
amplifier (g
mERR
)(R
C
).
APPLICATIOU
W
U
U
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1530CS8#PBF | 功能描述:IC SW REG CNTRLR SYNC ADJ 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:2,000 系列:- 應用:控制器，DSP 輸入電壓:4.5 V ~ 25 V 輸出數(shù):2 輸出電壓:最低可調(diào)至 1.2V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:30-TFSOP（0.173"，4.40mm 寬） 供應商設備封裝:30-TSSOP 包裝:帶卷 (TR) |
| LTC1530CS8#TR | 功能描述:IC SW REG CTRLR SYNC HIPWR 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
| LTC1530CS8#TRPBF | 功能描述:IC SW REG CNTRLR SYNC ADJ 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
| LTC1530CS8-1.9 | 功能描述:IC SW REG CNTRLR SYNC 1.9V 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
| LTC1530CS8-1.9#PBF | 功能描述:IC SW REG CNTRLR SYNC 1.9V 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
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