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参数资料
| 型号： | LT1425IS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/20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
TYPICAL APPLICATIO N S
The following are several application examples of the
LT1425. The first shows an isolated LAN supply which
provides – 9V with ± 1% load regulation for output cur-
rents of 0mA to 250mA. An alternate transformer, the
Coiltronics part, provides a complete PCMCIA Type II
height solution. The LT1425 offers excellent load regula-
tion and fast dynamic response not found in similar
isolated flyback schemes.
The next example shows a ± 15V supply with 1.5kV of
isolation. The sum of line/load/cross regulation is better
than ± 3%. Full load efficiency is between 72% (V IN = 5V)
and 80% (V IN = 15V). The isolation is ultimately limited
only by bobbin selection and transformer construction.
The “– 48V to 5V Isolated Telecom Supply” uses an
external cascoded 200V MOSFET to extend the LT1425’s
35V maximum switch voltage limit. The input voltage
range (– 36V to – 72V) also exceeds the LT1425’s 20V
maximum input voltage, so a bootstrap winding is used.
D1, D2, Q2 and Q3 and associated components for the
necessary start-up circuitry with hysteresis. When C1
charges to 15V, switching begins and the bootstrap wind-
ing begins to supply power before C1 has a chance to
discharge to 11V. Feedback voltage is fed directly through
a resistor divider to the R REF pin. The load compensation
circuitry is bypassed, resulting in ± 5% load regulation.
Finally, the “12V to 5V Isolated Converter” is similar to the
previous example in that a cascoded MOSFET is used to
prevent voltage breakdown of the output switch. But
because the nominal 12V input is well within the range of
the V IN pin, no bootstrap winding is required and normal
load compensation function is provided. Diode D1, tran-
sistor Q1 and associated components provide an under-
voltage lockout function via the SHDN pin. The off-the-
shelf transformer provides up to 5W of isolated regulated
power.
– 9V Isolated LAN Supply
5V
R2
C6
C5
2
1
7
C1
10 μ F
25V
C2
10 μ F
25V
100k
1000pF
0.1 μ F
47pF
22.1k
1%
3.01k
1%
1
2
3
4
5
6
7
8
GND
NC
R FB
V C
R REF
SYNC
SGND
GND
LT1425
GND
SHDN
R OCOMP
R CCOMP
V IN
V SW
PGND
GND
16
15
14
13
12
11
10
9
R3
0.1 μ F
D1
MBRS130LT3
R1
T1
C3 C4
10 μ F 10 μ F
D2 25V 25V
4 3 6
C1, C2, C3, C4 = MARCON THCS50E1E106Z CERAMIC
CAPACITOR, SIZE 1812. (847) 696-2000
OUT
COM
1.8k
–9V
INPUT
COM
Transformer T1
1424/25 TA03
LPRI
RATIO
ISOLATION
(L × W × H)
I OUT
EFFICIENCY
D1
D2
R1, R2
C5, C6
R3
DALE
LPE-4841-A307
COILTRONICS
CTX02-13483
36 μ H
27 μ H
1:1:1
1:1
500VAC
500VAC
10.7 × 11.5 × 6.3mm
14 × 14 × 2.2mm
250mA
200mA
76%
70%
NOT USED
1N5248
NOT USED
MBR0540TL1
47 ?
75 ?
330pF
220pF
13.3k
5.9k
17
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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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