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参数资料
| 型号： | 750105 |
| 厂商： | Wurth Electronics Inc |
| 文件页数： | 17/24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
L S
V C
C
R
D
?
?
V IN
NV OUT
3574 F09
t SP
3574 F10
L S PK SW = C C OUT
1 V ( V ? N ? V )
I f
Figure9.RCDSnubberinaFlybackConverter
During switch turn-off, the energy stored in the leakage
inductance is transferred to the snubber capacitor, and
eventually dissipated in the snubber resistor.
2
2 R
The snubber resistor affects the spike amplitude VC and
duration t SP , the snubber resistor is adjusted such that
t SP is about 150ns. Prolonged t SP may cause distortion
to the output voltage sensing.
The previous steps finish the flyback power stage
design.
5. Select the feedback resistor for proper output
voltage.
Using the resistor Tables 1-4, select the feedback resis-
tor R FB , and program the output voltage to 5V. Adjust the
R TC resistor for temperature compensation of the output
voltage. R REF is selected as 6.04k.
Figure 10. Typical Switch Node Waveform
A small capacitor in parallel with R REF filters out the noise
during the voltage spike, however, the capacitor should
limit to 10pF. A large capacitor causes distortion on volt-
age sensing.
6. Optimize the compensation network to improve the
transient performance.
The transient performance is optimized by adjusting the
compensation network. For best ripple performance, select
a compensation capacitor not less than 1nF, and select a
compensation resistor not greater than 50k.
7. Current limit resistor, soft-start capacitor and UVLO
resistor divider
Use the current limit resistor R LIM to lower the current
limit if a compact transformer design is required. Soft-start
capacitor helps during the start-up of the flyback converter.
Select the UVLO resistor divider for intended input opera-
tion range. These equations are aforementioned.
3574f
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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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