參數(shù)資料
型號(hào)： LTC1624IS8
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： Isolated Flyback Switching Regulator with 9V Output
中文描述： 2 A SWITCHING CONTROLLER, 225 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 0.150 INCH, PLASTIC, SOP-8
文件頁(yè)數(shù)： 14/28頁(yè)
文件大?。?/td> 490K
代理商： LTC1624IS8
14
LTC1624
Boost Converters: Power MOSFET Selection
One external N-channel power MOSFET must be selected
for use with the LTC1624 for the switch. In boost applica-
tions the source of the power MOSFET is grounded along
with the SW pin. The peak-to-peak gate drive levels are set
by the INTV
CC
voltage. The gate drive voltage is equal to
approximately 5V for V
IN
> 5.6V and a logic level MOSFET
can be used. At V
IN
voltages below 5V the gate drive
voltage is equal to V
IN
– 0.6V and a sublogic level MOSFET
should be used.
Selection criteria for the power MOSFET include the “ON”
resistance R
DS(ON)
, reverse transfer capacitance C
RSS
,
input voltage and maximum output current. When the
LTC1624 is operating in continuous mode the duty cycle
for the MOSFET is given by:
Main Switch Duty Cycle =1
+
V
V
V
IN
OUT
D
The MOSFET power dissipation at maximum output cur-
rent is given by:
(
APPLICATIO
S I
N
FOR
ATIO
U
W
U
Boost Converter: Inductor Selection
For most applications the inductor will fall in the range of
10
μ
H to 100
μ
H. Higher values reduce the input ripple
voltage and reduce core loss. Lower inductor values are
chosen to reduce physical size.
The input current of the boost converter is calculated at full
load current. Peak inductor current can be significantly
higher than output current, especially with smaller induc-
tors and lighter loads. The following formula assumes
continuous mode operation and calculates maximum peak
inductor current at minimum V
IN
:
I
I
V
V
I
L PEAK
OUT MAX
OUT
IN MIN
L MAX
2
)
)
)
)
=
The ripple current in the inductor (
I
L
) is typically 20% to
30% of the peak inductor current occuring at V
IN(MIN)
and
I
OUT(MAX)
.
(
(
I
V
V
V
V
kHz L V
)( )
V
L
IN
OUT
D
IN
+
OUT
D
P-P
(
)
=
+
)
(
)
200
with
I
L(MAX)
=
I
L(P-P)
at V
IN
= V
IN(MIN)
.
Remember boost converters are not short-circuit pro-
tected, and that under output short conditions, inductor
current is limited only by the available current of the input
supply, I
OUT(OVERLOAD)
. Specify the maximum inductor
current to safely handle the greater of I
L(PEAK)
or
I
OUT(OVERLOAD)
. Make sure the inductor’s saturation cur-
rent rating (current when inductance begins to fall)
exceeds the maximum current rating set by R
SENSE
.
Boost Converter: R
SENSE
Selection for Maximum
Output Current
R
SENSE
is chosen based on the required output current.
Remember the LTC1624 current comparator has a maxi-
mum threshold of 160mV/R
SENSE
. The current compara-
tor threshold sets the peak of the inductor current, yielding
a maximum average output current I
OUT(MAX)
equal to
I
L(PEAK)
less half the peak-to-peak ripple current (
I
L
),
divided by the output-input voltage ratio (see equation for
I
L(PEAK)
)
.
P
I
V
V
V
R
k V
I
C
kHz
where
I
I
V
V
V
MAIN
IN MAX
IN MIN
OUT
D
DS ON
OUT
IN MAX
RSS
IN MAX
OUT MAX
OUT
D
)
IN MIN
=
+
+
(
)
+
)
)
(
)(
)
=
+
)
)
)
)
2
1 85
.
1
1
200
δ
δ
is the temperature dependency of R
DS(ON)
and k is a
constant inversely related to the gate drive current.
MOSFETs have I
2
R losses, plus the P
MAIN
equation
includes an additional term for transition losses that are
highest at high output voltages. For V
OUT
< 20V the high
current efficiency generally improves with larger MOSFETs,
while for V
OUT
> 20V the transition losses rapidly increase
to the point that the use of a higher R
DS(ON)
device with
lower C
RSS
actual provides higher efficiency. For addi-
tional information refer to Step-Down Converter: Power
MOSFET Selection in the Applications Information
section.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1624IS8#PBF 功能描述:IC REG CTRLR BST FLYBK INV 8SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤(pán) 包裝:Digi-Reel® 產(chǎn)品目錄頁(yè)面:1303 (CN2011-ZH PDF) 其它名稱(chēng):LM3754SQDKR
LTC1624IS8#PBF 制造商:Linear Technology 功能描述:DC/DC Converter IC
LTC1624IS8#TR 功能描述:IC REG CTRLR BST FLYBK INV 8SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
LTC1624IS8#TRPBF 功能描述:IC REG CTRLR BST FLYBK INV 8SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
LTC1624IS8PBF 制造商:Linear Technology 功能描述:N-Channel Sw. Regulator Controller SOIC8
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