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參數(shù)資料
| 型號： | LT1424CN8-5 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 1.9 A SWITCHING REGULATOR, 320 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 141K |
| 代理商： | LT1424CN8-5 |
10
LT1424-5
OPERATIO
time. Certain parameters of flyback amp behavior will then
be directly affected by the variable enable period. These
include effective transconductance and V
C
node slew rate.
U
LOAD COMPENSATION THEORY
The LT1424-5 uses the flyback pulse to obtain information
about the isolated output voltage. A potential error source
is caused by transformer secondary current flow through
the real life nonzero impedances of the output rectifier,
transformer secondary and output capacitor. This has
been represented previously by the expression (I
SEC
)(ESR).
However, it is generally more useful to convert this expres-
sion to an effective output impedance. Because the sec-
ondary current only flows during the off portion of the duty
cycle, the effective output impedance equals the lumped
secondary impedance times the inverse of the OFF duty
cycle. That is,
DC OFF
)
R
OUT
= ESR
R
OUT
= Effective supply output impedance
ESR = Lumped secondary impedance
DC OFF = OFF duty cycle
where,
1
)
Expressing this in terms of the ON duty cycle, remember-
ing DC OFF = 1 – DC,
1 – DC
)
R
OUT
= ESR
DC = ON duty cycle
1
)
In less critical applications, or if output load current
remains relatively constant, this output impedance error
may be judged acceptable and the external R
FB
resistor
value adjusted to compensate for nominal expected error.
In more demanding applications, output impedance error
may be minimized by the use of the load compensation
function.
To implement the load compensation function, a voltage
is developed that is proportional to average output switch
current. This voltage is then impressed across the inter-
nal R
OCOMP
resistor and the resulting current is then
subtracted from the R
FB
node. As output loading in-
creases, average switch current increases to maintain
rough output voltage regulation. This causes an increase
in R
OCOMP
resistor current subtracted from the R
FB
node,
through which feedback loop action causes a corre-
sponding increase in target output voltage.
Assuming a relatively fixed power supply efficiency, Eff
Power Out = (Eff)(Power In)
(V
OUT
)(I
OUT
) = (Eff)(V
IN
)(I
IN
)
Average primary side current may be expressed in terms
of output current as follows:
(V
IN
)(Eff)
)
I
IN
=
I
OUT
V
OUT
)
combining the efficiency and voltage terms in a single
variable,
K1
=
I
IN
= K1(I
OUT
) where,
V
OUT
)
(V
IN
)(Eff)
)
Switch current is converted to voltage by a sense resistor
and amplified by the current sense amplifier with associ-
ated gain G. This voltage is then impressed across the
internal R
OCOMP
resistor to form a current that is
subtracted from the R
FB
node. So the effective change in
V
OUT
target is:
)
V
OUT
= K1(
I
OUT
)
= K1(R
SENSE
)(G)
R
FB
and,
(R
SENSE
)(G)
R
OCOMP
R
OCOMP
)
V
OUT
I
OUT
)
R
FB
)
Nominal output impedance cancellation is obtained by
equating this expression with R
OUT
.
For simplicity, the data sheet refers to
V
REF
/
I
SW
. This is
given as:
R
OCOMP
)
= (R
SENSE
)(G)
V
REF
I
SW
R
FB
)
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PDF描述 |
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| LT1424CN8-9 | Isolated Flyback Switching Regulator with 9V Output |
| LT1424IS8-5 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1424IS8-9 | Isolated Flyback Switching Regulator with 9V Output |
| LT1424-5 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1424-9 | Isolated Flyback Switching Regulator with 9V Output |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1424CN8-5#PBF | 功能描述:IC REG FLYBACK ISOLATED 5V 8DIP 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:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LT1424CN8-9 | 功能描述:IC REG FLYBACK ISOLATED 9V 8DIP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LT1424CN8-9#PBF | 功能描述:IC REG FLYBACK ISOLATED 9V 8DIP 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:- 標(biāo)準(zhǔn)包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| LT1424CS8 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Mode SMPS Controller |
| LT1424CS8-5 | 功能描述:IC REG FLYBACK ISOLATED 5V 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
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