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参数资料
| 型号： | 750105 |
| 厂商： | Wurth Electronics Inc |
| 文件页数： | 10/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR LT3574 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，隔离 |
| 功率 - 输出： | 2.5W |
| 输出电压： | 5V |
| 电流 - 输出： | 500mA（最小值） |
| 输入电压： | 10 ~ 30 V |
| 稳压器拓扑结构： | 回扫 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LT3574 |
| 其它名称： | 732-3309 |
LT3574
APPLICATIONS INFORMATION
Table 2. Common Resistor Values for 2:1 Transformers
V OUT (V) N PS R FB (kΩ) R REF (kΩ) R TC (kΩ)
3.3 2.00 37.4 6.04 18.7
5 2.00 56 6.04 28
12 2.00 130 6.04 66.5
15 2.00 162 6.04 80.6
Table 3. Common Resistor Values for 3:1 Transformers
V OUT (V) N PS R FB (kΩ) R REF (kΩ) R TC (kΩ)
3.3 3.00 56.2 6.04 20
5 3.00 80.6 6.04 28.7
10 3.00 165 6.04 54.9
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 flyback converter has a complicated relationship be-
tween 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 flyback 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
predict output power. In addition, the winding ratio can
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
power if the switch voltage is 50V during the off-time. To
achieve this power level at a given input, a winding ratio
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.
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 fits this design
example perfectly and outputs close to 2.5W at 30V but
lowers to 2W at 20V.
3.5
3.0
2.5
2.0
1.5
1.0
0.5
3.5
3.0
2.5
2.0
1.5
1.0
0.5
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
5
10
15
20
25
30
35
40
45
0
0
5
10
15
20
25
30
35
40
45
0
0
5
10
15
20
25
30
35
40
45
INPUT VOLTAGE (V)
3574 F01
INPUT VOLTAGE (V)
3574 F02
INPUT VOLTAGE (V)
3574 F03
MAX POWER OUTPUT
1:1 5:1
2:1 7:1
3:1 10:1
4:1
Figure 1. Output Power for 3.3V Output
MAX POWER OUTPUT
1:1 4:1
2:1 5:1
3:1 7:1
Figure 2. Output Power for 5V Output
MAX POWER OUTPUT
1:1
2:1
3:1
Figure 3. Output Power for 12V Output
3574f
0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 75010531 | 制造商:PHILIPS 功能描述:STARTER FLUORESCENT TUBE 70-125W 制造商:Philco/Philips 功能描述:STARTER, FLUORESCENT TUBE, 70-125W 制造商:NXP Semiconductors 功能描述:STARTER, FLUORESCENT TUBE, 70-125W; Accessory Type:Starter; For Use With:Fluorescent; SVHC:No SVHC (18-Jun-2012); Power Rating:125W; Supply Voltage:240V ;RoHS Compliant: Yes |
| 750-105-R220/270 | 制造商:CTS Corporation 功能描述: |
| 750-105-R220/330 | 制造商: 功能描述: 制造商:undefined 功能描述: 制造商:CTS Corporation 功能描述:S10-R220/330 |
| 750106 | 功能描述:BOARD EVAL FOR LT3575 RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
| 750-106 | 制造商:GLENAIR 制造商全称:Glenair, Inc. 功能描述:Pre-Terminated Assemblies |
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