您的位置：维库电子市场网 > Datasheet > LTC1624CS

LTC1624CS Datasheet

  • LTC1624CS

  • Linear Technology [High Efficiency SO-8 N-Channel Switching...

  • 492.67KB

  • LINER

阅览下载 纠错 0

扫码查看芯片数据手册

上传产品规格书

PDF预览

LTC1624
APPLICATIONS INFORMATION
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
鈥?0.6V and a sublogic level MOSFET
should be used.
Selection criteria for the power MOSFET include the 鈥淥N鈥?/div>
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鈭?/div>
V
IN
V
OUT
+
V
D
Boost Converter: Inductor Selection
For most applications the inductor will fall in the range of
10碌H to 100碌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
:
铮?/div>
铮?鈭?/div>
I
L MAX
V
OUT
铮?
I
L PEAK
=
I
OUT MAX
铮?/div>
2
铮?/div>
V
IN MIN
铮?/div>
铮?/div>
铮?/div>
The MOSFET power dissipation at maximum output cur-
rent is given by:
铮?/div>
V
铮?/div>
I
铮?铮?/div>
1
鈭?/div>
IN MIN
铮?/div>
1
+ 未
R
P
MAIN
=
IN MAX
DS ON
+
铮?/div>
铮?铮?/div>
V
+
V
D
铮?/div>
OUT
铮?/div>
铮?/div>
( )
2
铮?/div>
( )
( )
( )
)
k V
OUT
(
)
1
.
85
铮?/div>
I
IN MAX
铮?/div>
C
RSS
200kHz
铮?/div>
铮?/div>
( )
( )(
铮?/div>
铮?/div>
V
OUT
+
V
D
铮?/div>
where I
IN MAX
=
I
OUT MAX
铮?/div>
铮?/div>
V
IN MIN
铮?/div>
铮?/div>
铮?/div>
( )
( )
( )
未
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.
14
U
W
U
U
(
)
( )
( )
( )
The ripple current in the inductor (鈭咺
L
) is typically 20% to
30% of the peak inductor current occuring at V
IN(MIN)
and
I
OUT(MAX)
.
鈭咺
L P-P
=
( )
(
200kHz
)(
L
)(
V
OUT
+
V
D
)
V
IN
V
OUT
+
V
D
鈭?/div>
V
IN
(
)
with
鈭咺
L(MAX)
=
鈭咺
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鈥檚 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 (鈭咺
L
),
divided by the output-input voltage ratio (see equation for
I
L(PEAK)
)
.

LTC1624CS相关型号PDF文件下载

  • 型号
    版本
    描述
    厂商
    下载
  • LTC1040
    英文版
    Dual Micropower Comparator
    LINER
    LTC1040
  • LTC1040
    英文版
    DUAL MICROPOWER COMPARATOR
    LINER [Lin...
    LTC1040
  • LTC1040
    英文版
    Dual Micropower Comparator
    LINER [Lin...
    LTC1040
  • LTC1041
    英文版
    BANG-BANG Controller
    LINER
    LTC1041
  • LTC1041
    英文版
    BANG-BANG Controller
    LINER [Lin...
    LTC1041
  • LTC1042
    英文版
    Window Comparator
    LINER
    LTC1042
  • LTC1042
    英文版
    Window Comparator
    LINER [Lin...
    LTC1042
  • LTC1042
    英文版
    Window Comparator
    LINER [Lin...
    LTC1042
  • LTC1043
    英文版
    2-Channel Differential Input 16-Bit No Latency DS ADC
    LINER
    LTC1043
  • LTC1043
    英文版
    2-Channel Differential Input 24-Bit No Latency DS ADC
    LINER [Lin...
    LTC1043
  • LTC1043
    英文版
    2-Channel Differential Input 16-Bit No Latency DS ADC
    LINER [Lin...
    LTC1043
  • LTC1043
    英文版
    Dual Precision Intrumentation Switched-Capacitor Building Bl...
    LINER [Lin...
    LTC1043
  • LTC1044
    英文版
    Switched Capacitor Voltage Converter
    LINER
    LTC1044
  • LTC1044
    英文版
    Switched Capacitor Voltage Converter
    LINER [Lin...
    LTC1044
  • LTC1045
    英文版
    Programmable Micropower Hex Translator/ Receiver/Driver
    LINER
    LTC1045
  • LTC1045
    英文版
    Programmable Micropower Hex Translator/ Receiver/Driver
    LINER [Lin...
    LTC1045
  • LTC1046
    英文版
    “Inductorless” 5V to + 5V Converter
    LINER
    LTC1046
  • LTC1046
    英文版
    “Inductorless” 5V to + 5V Converter
    LINER [Lin...
    LTC1046
  • LTC1047
    英文版
    Dual Micropower Chopper Stabilized Operational Amplifier wit...
    LINER
    LTC1047
  • LTC1047
    英文版
    Dual Micropower Zero-Drift Operational Amplifier with Intern...
    LINER [Lin...
    LTC1047

您可能感兴趣的PDF文件资料

热门IC型号推荐

©2024 维库电子市场网（www.dzsc.com）　备案号：浙B2-20050339-1 经营许可证：浙B2-20210386版权声明
买家服务热线：0571-85317607 | 买家服务部QQ： QQ:1609526468
卖家服务热线：0571-85317607 | 卖家服务部QQ： QQ:331652727

扫码下载APP，
一键连接广大的电子世界。

在线人工客服

买家服务：
卖家服务：

0571-85317607

客服在线时间周一至周五
9:00-17:30

关注官方微信号，
第一时间获取资讯。

建议反馈
返回顶部

建议反馈

联系人：

联系方式：

按住滑块，拖拽到最右边
>>
感谢您向阿库提出的宝贵意见，您的参与是维库提升服务的动力！意见一经采纳，将有感恩红包奉上哦！

PDF纠错X

投诉电话：0571-85317607 投诉QQ：

如选匿名将无法为您反馈投诉结果，建议实名投诉！