参数资料
型号: MIC2172BM TR
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: 2,500
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:
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: 带卷 (TR)
供应商设备封装: 8-SOIC
其它名称: MIC2172BMTR
( )
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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