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參數(shù)資料
| 型號： | LT1618EMS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter |
| 中文描述： | 2.8 A SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 202K |
| 代理商： | LT1618EMS |
LT1618
8
APPLICATIO
S I
FOR
ATIO
U
W
U
U
Figure 3
LOAD
V
OUT
L1
SWITCH
NODE
1618 F03
V
IN
HIGH
FREQUENCY
CIRCULATING
PATH
When sensing input current, the sense resistor should be
placed in front of the inductor (between the decoupling
capacitor and the inductor) as shown in the circuits in the
Typical Applications section. This will regulate the average
inductor current and maintain a consistent inductor ripple
current, which will, in turn, maintain a well regulated input
current. Do not place the sense resistor between the input
source and the input decoupling capacitor, as this may
allow the inductor ripple current to vary widely (even
though the average input current and the average inductor
current will still be regulated). Since the inductor current
is a triangular waveform (not a DC waveform like the
output current) some tweaking of the compensation
values (R
C
and C
C
on the V
C
pin) may be required to ensure
a clean inductor ripple current while the constant-current
loop is in effect. For these applications, the constant-
current loop response can usually be improved by reduc-
ing the R
C
value, or by adding a capacitor (with a value of
approximately C
C
/10) in parallel with the R
C
and C
C
compensation network.
Frequency Compensation
The LT1618 has an external compensation pin (V
C
), which
allows the loop response to be optimized for each applica-
tion. An external resistor and capacitor (or sometimes just
a capacitor) are placed at the V
C
pin to provide a pole and
a zero (or just a pole) to ensure proper loop compensation.
Numerous other poles and zeroes are present in the closed
loop transfer function of a switching regulator, so the V
C
pin pole and zero are positioned to provide the best loop
response. A thorough analysis of the switching regulator
control loop is not within the scope of this data sheet, and
will not be presented here, but values of 2k
and 10nF will
be a good choice for many designs. For those wishing to
optimize the compensation, use the 2k
and 10nF as a
starting point. For LED backlight applications where a
pulse-width modulation (PWM) signal is used to drive
the I
ADJ
pin, the resistor is usually not included in the
compensation network. This helps to provide additional
filtering of the PWM signal at the output of the error
amplifier (the V
C
pin).
Switch Node Considerations
To maximize efficiency, switch rise and fall times are made
as short as possible. To prevent radiation and high fre-
quency resonance problems, proper layout of the
highfrequency switching path is essential. Keep the output
switch (SW pin), diode and output capacitor as close
together as possible. Minimize the length and area of all
traces connected to the switch pin, and always use a
ground plane under the switching regulator to minimize
interplane coupling. The high speed switching current
path is shown in Figure 3. The signal path including the
switch, output diode and output capacitor contains nano-
second rise and fall times and should be kept as short as
possible.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1618 | Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter(恒定電流/恒定電壓，1.4MHz,步升DC/DC變換器) |
| LT1619 | Low Voltage Current Mode PWM Controller |
| LT1619ES8 | Low Voltage Current Mode PWM Controller |
| LT1619EMS8 | Low Voltage Current Mode PWM Controller |
| LT1620CS8 | Rail-to-Rail Current Sense Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1618EMS#PBF | 功能描述:IC REG BOOST ADJ 1.5A 10MSOP 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:250 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 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LT1618EMS#TR | 功能描述:IC REG BOOST ADJ 1.5A 10MSOP 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:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LT1618EMS#TRPBF | 功能描述:IC REG BOOST ADJ 1.5A 10MSOP 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:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LT1618EMSPBF | 制造商: 功能描述: 制造商:Linear Technology 功能描述:DC-DC Converter 1.4MHz Step-Up MSOP10 |
| LT1619 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2-Phase Step-Up DC/DC Controller |
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