- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377757 > LTC1624CS8 (LINEAR TECHNOLOGY CORP) 8-Bit, 40 kSPS ADC Serial Out, Low Power, Compatible to TLC540/545/1540, Single Ch. 8-SO PDF資料下載
參數(shù)資料
| 型號： | LTC1624CS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 8-Bit, 40 kSPS ADC Serial Out, Low Power, Compatible to TLC540/545/1540, Single Ch. 8-SO |
| 中文描述： | 2 A SWITCHING CONTROLLER, 225 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SOP-8 |
| 文件頁數(shù)： | 19/28頁 |
| 文件大?。?/td> | 490K |
| 代理商： | LTC1624CS8 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁當(dāng)前第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
19
LTC1624
where
I
V
V
V
V
OUT MAX
IN
OUT
D
IN
:
I
SW MAX
)
)
=
+
+
δ
is the temperature dependency of R
DS(ON)
and k is a
constant inversely related to the gate drive current. The
maximum switch current occurs at V
IN(MIN)
and the peak
switch current is I
SW(MAX)
+
I
L
/2. The maximum voltage
across the switch is V
IN(MAX)
+
V
OUT
.
MOSFETs have I
2
R losses plus the P
MAIN
equation
includes an additional term for transition losses that are
highest at high total input plus output voltages. For
(
V
OUT
+ V
IN
) < 20V the high current efficiency generally
improves with larger MOSFETs, while for (
V
OUT
+ V
IN
)
> 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 additional informa-
tion refer to the Step-Down Converter: Power MOSFET
Selection in the Applications Information section.
Positive-to-Negative 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 and output
ripple voltage (although not as much as step-down con-
verters) and also reduce core loss. Lower inductor values
are chosen to reduce physical size and improve transient
response but do increase output ripple.
Like the boost converter, the input current of the positive-
to-negative converter is calculated at full load current.
Peak inductor current can be significantly higher than
output current, especially with smaller inductors (with
high
I
L
values). The following formula assumes continu-
ous mode operation and calculates maximum peak induc-
tor current at minimum V
IN
:
I
I
V
V
V
V
I
L PEAK
OUT MAX
IN
OUT
D
IN
L
)
)
=
+
+
+
2
The ripple current in the inductor (
I
L
) is typically 20% to
50% of the peak inductor current occuring at V
IN(MIN)
and
I
OUT(MAX)
to minimize output ripple. Maximum
I
L
occurs
at minimum V
IN
.
APPLICATIO
S I
N
FOR
ATIO
U
W
U
I
V
V
(
V
kHz L V
)( )
V
V
L
IN
OUT
D
IN
OUT
D
P-P
(
)
=
( )
+
(
)
(
+
+
)
200
Specify the maximum inductor current to safely handle
I
L(PEAK)
. Make sure the inductor’s saturation current rat-
ing (current when inductance begins to fall) exceeds the
maximum current rating set by R
SENSE
.
Positive-to-Negative 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 with the
remainder divided by the duty cycle.
Allowing a margin for variations in the LTC1624 (without
considering variation in R
SENSE
) and assuming 30% ripple
current in the inductor, yields:
R
mV
I
V
V
V
V
SENSE
OUT MAX
IN MIN
+
)
IN MIN
OUT
D
=
+
)
)
100
Positive-to-Negative Converter: Output Diode
The output diode conducts current only during the switch
off-time. Peak reverse voltage for positive-to-negative
converters is equal to
V
OUT
+ V
IN
. Average forward
current in normal operation is equal to I
D(PEAK)
–
I
L
/2.
Peak diode current (occurring at V
IN(MIN)
) is:
(
I
I
V
V
V
I
D PEAK
OUT MAX
OUT
D
IN
L
)
)
=
+
)
+
1
2
Positive-to-Negative Converter: Input and
Output Capacitors
The output capacitor is normally chosen by its effective
series resistance (ESR), because this is what determines
output ripple voltage. Both input and output capacitors
need to be sized to handle the ripple current safely.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1624IS | Isolated Flyback Switching Regulator with 9V Output |
| LTC1624 | High Efficiency SO-8 N-Channel Switching Regulator Controller(SO-8封裝，高效率，N溝道開關(guān)穩(wěn)壓控制器) |
| LTC1625C | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC1625CGN | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC1625IGN | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1624CS8#PBF | 功能描述:IC REG CTRLR BST FLYBK INV 8SOIC RoHS:是 類別: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 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| LTC1624CS8#TR | 功能描述:IC REG CTRLR BST FLYBK INV 8SOIC RoHS:否 類別: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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC1624CS8#TRPBF | 功能描述:IC REG CTRLR BST FLYBK INV 8SOIC RoHS:是 類別: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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC1624CS8PBF | 制造商:Linear Technology 功能描述:LTC1624CS8PBF |
| LTC1624IS8 | 功能描述:IC REG CTRLR BST FLYBK INV 8SOIC RoHS:否 類別: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 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。