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参数资料
| 型号： | MIC3172YN |
| 厂商： | Micrel Inc |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST INV CUK 8DIP |
| 标准包装： | 50 |
| 类型： | 降压（降压），升压（升压），反相，Cuk |
| 输出数： | 1 |
| 输入电压： | 3 V ~ 40 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 100kHz |
| 电流 - 输出： | 1.25A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 供应商设备封装： | 8-PDIP |
| 产品目录页面： | 1093 (CN2011-ZH PDF) |
| 其它名称： | 576-2255 MIC3172YN-ND |
( )
0.5 × 1 × 10 5 × 4.0 2 5.5 × 10 ? 6
Micrel
F CE = safety derating factor (0.8 for most
commercial and industrial applications)
V IN(max) = maximum input voltage
V SEC = transformer secondary voltage (V OUT + V F )
For the practical example:
V CE = 65V max. for the MIC2172/3172
F CE = 0.8
V SEC = 5.6V
Then:
MIC2172/3172
Then:
2
L PRI ≤
1.25
L PRI ≤ 19.23μH
Use an 18μH primary inductance to overcome circuit
inefficiencies.
To complete the design the inductance value of the
secondary is found which will guarantee that the energy
stored in the transformer during the power switch on
a ≤
65 × 0.8 ± 6.0
5.6
time will be completed discharged into the output during
the off-time. This is necessary when operating in
discontinuous-mode.
a ≤ 8.2143
Next, calculate the maximum primary inductance
required to store the needed output energy with a power
switch duty cycle of 55%.
L SEC ≤
Where:
0.5 f SW V SEC 2 T OFF 2
P OUT
(11)
0.5 f SW V IN(min) 2 T ON 2
( )
0.5 × 1 × 10 5 × 5.6 2 × 4.5 × 10 ? 6
L PRI ≤
P OUT
Where:
L PRI = maximum primary inductance
f SW = device switching frequency (100kHz)
V IN(min) = minimum input voltage
(10)
L SEC = maximum secondary inductance
T OFF = power switch off time
Then:
2
L SEC ≤
1.25
L SEC ≤ 25.4μH
T ON = power switch on time
Figure 12. MIC3172 5V 0.25A Flyback Converter
April 2006
16
M9999-041806
(408) 955-1690
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相关代理商/技术参数 |
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|---|---|
| MIC3201 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High Brightness LED Driver with High-Side Current Sense |
| MIC3201_11 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High Brightness LED Driver with High-Side Current Sense |
| MIC3201YME | 功能描述:LED照明驱动器 HBLED Driver with High-Side Current Sense RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MIC3201YME EV | 制造商:Micrel Inc 功能描述: |
| MIC3201YME TR | 功能描述:LED照明驱动器 HBLED Driver with High-Side Current Sense RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
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