- 您现在的位置：买卖IC网 > PDF目录149343 > LTC1430CS#PBF (LINEAR TECHNOLOGY CORP) Isolated Flyback Switching Regulator with 9V Output PDF资料下载
参数资料
| 型号： | LTC1430CS#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | Isolated Flyback Switching Regulator with 9V Output |
| 中文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 0.150 INCH, PLASTIC, SO-16 |
| 文件页数： | 15/16页 |
| 文件大小： | 211K |
| 代理商： | LTC1430CS#PBF |
8
LTC1430
Once the threshold voltage has been selected, RON should
be chosen based on input and output voltage, allowable
power dissipation and maximum required output current.
In a typical LTC1430 buck converter circuit operating in
continuous mode, the average inductor current is equal to
the output load current. This current is always flowing
through either M1 or M2 with the power dissipation split
up according to the duty cycle:
DC M
V
DC M
V
VV
V
OUT
IN
OUT
IN
OUT
IN
()
1
21
=
()
The RON required for a given conduction loss can now be
calculated by rearranging the relation P = I2R:
RM
PM
DC M
I
VP
M
VI
ON
MAX
IN
MAX
OUT
MAX
()
1
2
=
=
RM
PM
DC M
I
VP
M
VV
I
ON
MAX
IN
MAX
IN
OUT
MAX
()
2
=
=
()
PMAX should be calculated based primarily on required
efficiency. A typical high efficiency circuit designed for 5V
in, 3.3V at 10A out might require no more than 3%
efficiency loss at full load for each MOSFET. Assuming
roughly 90% efficiency at this current level, this gives a
PMAX value of (3.3V 10A/0.9) 0.03 = 1.1W per FET and
a required RON of:
RM
VW
VA
RM
VW
VV
A
ON
()
.
()
.
1
51 1
33
10
0 017
2
51 1
53 3
10
0 032
2
=
=
()
=
Note that the required RON for M2 is roughly twice that of
M1 in this example. This application might specify a single
0.03
device for M2 and parallel two more of the same
devices to form M1. Note also that while the required RON
values suggest large MOSFETs, the dissipation numbers
are only 1.1W per device or less—large TO-220 packages
and heat sinks are not necessarily required in high effi-
ciency applications. Siliconix Si4410DY (in SO-8) and
Motorola MTD20N03HL (in DPAK) are two small, surface
mount devices with RON values of 0.03 or below with 5V
of gate drive; both work well in LTC1430 circuits with up
to 10A output current. A higher PMAX value will generally
decrease MOSFET cost and circuit efficiency and increase
MOSFET heat sink requirements.
Inductor
The inductor is often the largest component in an LTC1430
design and should be chosen carefully. Inductor value and
type should be chosen based on output slew rate require-
ments and expected peak current. Inductor value is prima-
rily controlled by the required current slew rate. The
maximum rate of rise of the current in the inductor is set
by its value, the input-to-output voltage differential and the
maximum duty cycle of the LTC1430. In a typical 5V to
3.3V application, the maximum rise time will be:
90
153
%
.
()
=
VV
L
AMPS
SECOND
A
s
I
L
IN
OUT
where L is the inductor value in
H. A 2H inductor would
have a 0.76A/
s rise time in this application, resulting in a
6.5
sdelayinrespondingtoa5Aloadcurrentstep.During
this 6.5
s,thedifferencebetweentheinductorcurrentand
the output current must be made up by the output capaci-
tor, causing a temporary droop at the output. To minimize
this effect, the inductor value should usually be in the 1
H
to 5
H range for most typical 5V to 3.xV LTC1430 circuits.
Different combinations of input and output voltages and
expected loads may require different values.
Once the required value is known, the inductor core type
can be chosen based on peak current and efficiency
requirements. Peak current in the inductor will be equal to
the maximum output load current added to half the peak-
to- peak inductor ripple current. Ripple current is set by the
APPLICATIO S I FOR ATIO
WU
U
相关PDF资料 |
PDF描述 |
|---|---|
| LTC1430IS#PBF | Isolated Flyback Switching Regulator with 9V Output |
| LTC1430IS#TRPBF | Isolated Flyback Switching Regulator with 9V Output |
| LTC1435AIG#TRPBF | High Efficiency Low Noise Synchronous Step-Down Switching Regulator |
| LTC1435AIS#TRPBF | High Efficiency Low Noise Synchronous Step-Down Switching Regulator |
| LTC1436ACGN#PBF | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1430CSTR | 制造商:LT 功能描述:* |
| LTC1430IS | 功能描述:IC SW REG CNTRLR STEP-DWN 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC1430IS#PBF | 功能描述:IC SW REG CNTRLR STEP-DWN 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC1430IS#TR | 功能描述:IC SW REG CNTRLR STEP-DWN 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC1430IS#TRPBF | 功能描述:IC SW REG CNTRLR STEP-DWN 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
发布紧急采购，3分钟左右您将得到回复。