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参数资料
| 型号： | LT1425IS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG FLYBK ISOLATED .2A 16SOIC |
| 标准包装： | 50 |
| 类型： | 回扫，隔离 |
| 输出数： | 1 |
| 输入电压： | 2.8 V ~ 20 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 285kHz |
| 电流 - 输出： | 200mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 16-SOIC |
| 产品目录页面： | 1327 (CN2011-ZH PDF) |
LT1425
Isolated Flyback
Switching Regulator
FEATURES
DESCRIPTIO N
s
s
s
s
s
s
s
s
No Transformer “Third Winding” or Optoisolator
Required
± 5% Accurate Output Voltage Without User Trims
(See Circuit Below)
Resistor Programmable Output Voltage
Regulation Maintained Well Into Discontinuous
Mode (Light Load)
Optional Load Compensation
Operating Frequency: 285kHz
Easily Synchronized to External Clock
Available in 16-Pin Narrow SO Package
The LT ? 1425 is a monolithic high power switching regu-
lator specifically designed for the isolated flyback topol-
ogy. No “third winding” or optoisolator is required; the
integrated circuit senses the isolated output voltage
directly from the primary side flyback waveform. A high
current, high efficiency switch is included on the die along
with all oscillator, control and protection circuitry.
The LT1425 operates with input supply voltages from 3V
to 20V and draws only 7mA quiescent current. It can
deliver output power up to 6W with no external power
devices. By utilizing current mode switching techniques, it
APPLICATIO N S
provides excellent AC and DC line regulation.
The LT1425 has a number of features not found on other
s
s
s
s
Isolated Flyback Switching Regulators
Ethernet Isolated 5V to – 9V Converters
Medical Instruments
Isolated Telecom Supplies
, LTC and LT are registered trademarks of Linear Technology Corporation.
switching regulator ICs. Its unique control circuitry can
maintain regulation well into discontinuous mode in most
applications. Optional load compensation circuitry allows
for improved load regulation. An externally activated shut-
down mode reduces total supply current to 15 μ A for
standby operation.
TYPICAL APPLICATIO N
5V to Isolated – 9V OUT
500V
ISOLATION BARRIER
9.5
Load Regulation
47 μ F
16V
22.6k
+
C1
100 μ F
10V
15
6
4
C3
1000pF
5V
12
V IN
V SW
LT1425
SHDN R FB
SYNC
V C R REF
R OCOMP
R CCOMP
SGND PGND
7 10
11
3
5
14
13
R1
1% *DALE LPE 4841-330MB
T1*
D1
1N5819
? ?
R2
3.01k
1%
R3
C4 15k
0.1 μ F
C2
F
V –
ISOLATED
–9V ± 5% AT
20mA TO 200mA
9.4
9.3
9.2
9.1
9.0
8.9
8.8
8.7
8.6
8.5
0
50 100 150
OUTPUT CURRENT (mA)
200
1425 TA02
1425 TA01
1
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| LT1431CN8 | 功能描述:IC VREF SHUNT ADJ 8-PDIP RoHS:否 类别:集成电路 (IC) >> PMIC - 电压基准 系列:- 产品培训模块:Voltage Reference Basics 标准包装:100 系列:- 基准类型:旁路，精度 输出电压:4.096V 容差:±0.075% 温度系数:50ppm/°C 输入电压:- 通道数:1 电流 - 阴极:1µA 电流 - 静态:- 电流 - 输出:10mA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:管件 |
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