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| 型号： | LT3575EFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/24页 |
| 文件大小： | 0K |
| 描述： | IC REG FLYBACK ISO ADJ 16TSSOP |
| 标准包装： | 95 |
| 类型： | 回扫，隔离 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 60V |
| 输入电压： | 3 V ~ 40 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 2.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TSSOP-EP |
| 配用： | 732-3306-ND - BOARD EVAL FOR LT3575 |
| 相关产品： | 732-2669-2-ND - TRANS FLYBACK LT3748 20UH SMD 732-2669-6-ND - TRANS FLYBACK LT3748 20UH SMD 732-2668-6-ND - TRANS FLYBACK LT3748 14UH SMD 732-2667-6-ND - TRANS FLYBACK LT3748 500UH SMD 732-2666-6-ND - TRANS FLYBACK LT3748 12UH SMD 732-2665-6-ND - TRANS FLYBACK LT3748 12UH SMD 732-2664-6-ND - TRANS FLYBACK LT3748 15UH SMD 732-2663-6-ND - TRANS FLYBACK LT3748 15UH SMD 732-2662-6-ND - TRANS FLYBACK LT3748 8UH SMD 732-2661-6-ND - TRANS FLYBACK LT3748 8UH SMD 更多... |
LT3575
APPLICATIONS INFORMATION
Table 2. Common Resistor Values for 2:1 Transformers
predict output power. In addition, the winding ratio can
V OUT (V)
3.3
5
12
15
N PS
2.00
2.00
2.00
2.00
R FB (kΩ)
37.4
56
130
162
R REF (kΩ)
6.04
6.04
6.04
6.04
R TC (kΩ)
18.7
28
66.5
80.6
be changed to multiply the output current at the expense
of a higher switch voltage.
The graphs in Figures 1-3 show the maximum output
power possible for the output voltages 3.3V, 5V, and 12V.
The maximum power output curve is the calculated output
Table 3. Common Resistor Values for 3:1 Transformers
power if the switch voltage is 50V during the off-time. To
achieve this power level at a given input, a winding ratio
V OUT (V)
3.3
5
10
N PS
3.00
3.00
3.00
R FB (kΩ)
56.2
80.6
165
R REF (kΩ)
6.04
6.04
6.04
R TC (kΩ)
20
28.7
54.9
value must be calculated to stress the switch to 50V,
resulting in some odd ratio values. The curves below are
examples of common winding ratio values and the amount
of output power at given input voltages.
Table 4. Common Resistor Values for 4:1 Transformers
V OUT (V) N PS R FB (kΩ) R REF (kΩ) R TC (kΩ)
3.3 4.00 76.8 6.04 19.1
5 4.00 113 6.04 28
Output Power
A ?yback converter has a complicated relationship between
the input and output current compared to a buck or a
boost. A boost has a relatively constant maximum input
current regardless of input voltage and a buck has a
relatively constant maximum output current regardless of
input voltage. This is due to the continuous nonswitching
behavior of the two currents. A ?yback converter has both
discontinuous input and output currents which makes it
similar to a nonisolated buck-boost. The duty cycle will
affect the input and output currents, making it hard to
One design example would be a 5V output converter with
a minimum input voltage of 20V and a maximum input
voltage of 30V. A three-to-one winding ratio ?ts this design
example perfectly and outputs close to ten watts at 30V
but lowers to eight watts at 20V.
TRANSFORMER DESIGN CONSIDERATIONS
Transformer speci?cation and design is perhaps the most
critical part of successfully applying the LT3575. In addition
to the usual list of caveats dealing with high frequency
isolated power supply transformer design, the following
information should be carefully considered.
Linear Technology has worked with several leading magnetic
component manufacturers to produce pre-designed ?yback
transformers for use with the LT3575. Table 5 shows the
details of several of these transformers.
10:1
14
12
10
MAX P OUT
7:1
5:1
4:1
MAXIMUM
OUTPUT
POWER
14
12
10
MAX P OUT
7:1
5:1
4:1
3:1
MAXIMUM
OUTPUT
POWER
14
MAXIMUM
OUTPUT
12 POWER
10
2:1
MAX P OUT
8
3:1
8
2:1
8
3:1
1:1
6
2:1
6
6
1:1
4
2
0
1:1
4
2
0
4
2
0
0
5
10
15
20
25
30
35
40
45
0
5
10
15
20
25
30
35
40
45
0
5
10
15
20
25
30
35
40
INPUT VOLTAGE (V)
3575 F01
INPUT VOLTAGE (V)
3573 F02
INPUT VOLTAGE (V)
3573 F03
Figure 1. Output Power for 3.3V Output
Figure 2. Output Power for 5V Output
Figure 3. Output Power for 12V Output
3575f
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3575IFE#PBF | 功能描述:IC REG FLYBACK ISO ADJ 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3575IFE#TRPBF | 功能描述:IC REG FLYBACK ISO ADJ 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LT3579 | 制造商:LINER 制造商全称:Linear Technology 功能描述:6A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3579-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:6A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3579EFE#PBF | 功能描述:IC REG MULTI CONFIG SYNC 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
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