- 您现在的位置：买卖IC网 > PDF目录14143 > MIC2172YM (Micrel Inc)IC REG MULTI CONFIG 1.25A 8SOIC PDF资料下载
参数资料
| 型号： | MIC2172YM |
| 厂商： | Micrel Inc |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG 1.25A 8SOIC |
| 标准包装： | 95 |
| 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： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
( )
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
相关PDF资料 |
PDF描述 |
|---|---|
| VE-BNP-EX-F3 | CONVERTER MOD DC/DC 13.8V 75W |
| GBC60DRYI-S13 | CONN EDGECARD 120POS .100 EXTEND |
| RBB45DHRT | CONN CARD EXTEND 90POS .050" |
| AP1506-K5L-U | IC REG BUCK ADJ 3A TO263-5 |
| VE-BNP-EW-F1 | CONVERTER MOD DC/DC 13.8V 100W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2172YM TR | 功能描述:直流/直流开关调节器 1.25A 100kHz Switching Regulator (Lead Free) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC2172YMTR | 制造商:Micrel 功能描述:Current Mode PWM Controller 65V 1.25A |
| MIC2172YM-TR | 制造商:Micrel Inc 功能描述: |
| MIC2172YN | 功能描述:直流/直流开关调节器 2.5A 100kHz Switching Regulator (Lead Free) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC2174 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:300kHz, Synchronous Buck Controller 300kHz, Synchronous Buck Controller |
发布紧急采购，3分钟左右您将得到回复。