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參數(shù)資料
| 型號(hào)： | MIC2172BN |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 3.5 A SWITCHING REGULATOR, 115 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 906K |
| 代理商： | MIC2172BN |
Micrel
MIC2172/3172
April 2006
16
M9999-041806
(408) 955-1690
FCE = safety derating factor (0.8 for most
commercial and industrial applications)
VIN(max) = maximum input voltage
VSEC = transformer secondary voltage (VOUT + VF)
For the practical example:
VCE = 65V max. for the MIC2172/3172
FCE = 0.8
VSEC = 5.6V
Then:
5.6
6.0
0.8
65
a
±
×
≤
a
≤ 8.2143
Next,
calculate
the
maximum
primary
inductance
required to store the needed output energy with a power
switch duty cycle of 55%.
OUT
2
ON
2
IN(min)
SW
PRI
P
T
V
f
0.5
L
≤
(10)
Where:
LPRI = maximum primary inductance
fSW = device switching frequency (100kHz)
VIN(min) = minimum input voltage
TON = power switch on time
Then:
()
1.25
10
5.5
4.0
10
1
0.5
L
2
6
2
5
PRI
×
≤
LPRI
≤ 19.23H
Use an 18H 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
time will be completed discharged into the output during
the off-time. This is necessary when operating in
discontinuous-mode.
OUT
2
OFF
2
SEC
SW
SEC
P
T
V
f
0.5
L
≤
(11)
Where:
LSEC = maximum secondary inductance
TOFF = power switch off time
Then:
()
1.25
10
4.5
5.6
10
1
0.5
L
2
6
2
5
SEC
×
≤
LSEC ≤ 25.4H
Figure 12. MIC3172 5V 0.25A Flyback Converter
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2172YM | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.25A 100kHz Switching Regulator (Lead Free) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MIC2172YM TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.25A 100kHz Switching Regulator (Lead Free) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體: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/直流開關(guān)調(diào)節(jié)器 2.5A 100kHz Switching Regulator (Lead Free) RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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