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參數(shù)資料
| 型號(hào)： | LT1425IS |
| 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： | 1.9 A SWITCHING REGULATOR, 320 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SOP-16 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大小： | 341K |
| 代理商： | LT1425IS |
16
LT1425
APPLICATIO
S I
N
FOR
ATIO
U
Average supply current (including driver current) is:
35
)
where,
I
SW
= Switch current
DC = On switch duty cycle
W
U
I
SW
)
I
IN
= 7mA + DC
Switch power dissipation is given by:
P
SW
= (I
SW
)
2
(R
SW
)(DC)
R
SW
= Output switch ON resistance
Total power dissipation of the die is the sum of supply
current times supply voltage plus switch power:
P
D(TOTAL)
= (I
IN
V
IN
) + P
SW
FREQUENCY COMPENSATION
Loop frequency compensation is performed by connect-
ing a capacitor from the output of the error amplifier (V
C
pin) to ground. An additional series resistor, often
required in traditional current mode switcher controllers
is usually not required, and can even prove detrimental.
The phase margin improvement traditionally offered by
this extra resistor will usually be already accomplished by
the nonzero secondary circuit impedance, which adds a
“zero” to the loop response.
In further contrast to traditional current mode switchers,
V
C
pin ripple is generally not an issue with the LT1425. The
dynamic nature of the clamped feedback amplifier forms
an effective track/hold type response, whereby the V
C
voltage changes during the flyback pulse, but is then
“held” during the subsequent “switch ON” portion of the
next cycle. This action naturally holds the V
C
voltage stable
during the current comparator sense action (current mode
switching).
PCB LAYOUT CONSIDERATIONS
For maximum efficiency, switch rise and fall times are
made as short as practical. To prevent radiation and high
frequency resonance problems, proper layout of the com-
ponents connected to the IC is essential, especially the
power paths (primary andsecondary). B field (magnetic)
radiation is minimized by keeping output diode, switch pin
and output bypass capacitor leads as short as possible. E
field radiation is kept low by minimizing the length and
area of all traces connected to the switch pin. A ground
plane should always be used under the switcher circuitry
to prevent interplane coupling.
The high speed switching current paths are shown sche-
matically in Figure 2. Minimum lead length in these paths
are essential to ensure clean switching and minimal EMI.
The path containing the input capacitor, transformer pri-
mary, output switch, the path containing the transformer
secondary, output diode and output capacitor are the only
ones containing nanosecond rise and fall times. Keep
these paths as short as possible.
HIGH
FREQUENCY
CIRCULATING
PATH
V
OUT
V
IN
HIGH
FREQUENCY
CIRCULATING
PATH
ISOLATED
LOAD
1425 F02
F
Figure 2
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1425 | Isolated Flyback Switching Regulator with 9V Output |
| LT1425CS | Isolated Flyback Switching Regulator with 9V Output |
| LT1431C | Programmable Reference |
| LT1431IN8 | Programmable Reference |
| LT1431IS8 | Programmable Reference |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1425IS#PBF | 功能描述:IC REG FLYBK ISOLATED .2A 16SOIC 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(xùn)模塊:MIC23xxx HyperLight Load™ Regulators 標(biāo)準(zhǔn)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 |
| LT1425IS#TR | 功能描述:IC REG FLYBK ISOLATED .2A 16SOIC 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 |
| LT1425IS#TRPBF | 功能描述:IC REG FLYBK ISOLATED .2A 16SOIC 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 |
| LT1425ISPBF | 制造商:Linear Technology 功能描述:Sw. Regulator Isolated Flyback SOIC16 |
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