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參數(shù)資料
| 型號(hào)： | MIC2171BU |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Isolated Flyback Switching Regulator with 9V Output |
| 中文描述： | 5.5 A SWITCHING REGULATOR, 115 kHz SWITCHING FREQ-MAX, PSSO5 |
| 封裝： | TO-263, 5 PIN |
| 文件頁(yè)數(shù)： | 5/10頁(yè) |
| 文件大?。?/td> | 80K |
| 代理商： | MIC2171BU |
1997
4-7
MIC2171
Block Diagram MIC2171
Micrel
4
Current
Amp.
Error
Amp.
1.24V
Ref.
Logic
Driver
Anti-Sat.
SW
100kHz
Osc.
Reg.
FB
COMP
GND
IN
D1
Q1
2.3V
Com-
parator
Functional Description
Refer to “Block Diagram MIC2171”.
Internal Power
The MIC2171 operates when V
IN
is
≥
2.6V. An internal 2.3V
regulator supplies biasing to all internal circuitry including a
precision 1.24V band gap reference.
PWM Operation
The 100kHz oscillator generates a signal with a duty cycle of
approximately 90%. The current-mode comparator output is
used to reduce the duty cycle when the current amplifier
output voltage exceeds the error amplifier output voltage.
The resulting PWM signal controls a driver which supplies
base current to output transistor Q1.
Current-Mode Advantages
The MIC2171 operates in current mode rather than voltage
mode. There are three distinct advantages to this technique.
Feedback loop compensation is greatly simplified because
inductor current sensing removes a pole from the closed loop
response. Inherent cycle-by-cycle current limiting greatly
improves the power switch reliability and provides automatic
output current limiting. Finally, current-mode operation pro-
vides automatic input voltage feed forward which prevents
instantaneous input voltage changes from disturbing the
output voltage setting.
Anti-Saturation
The anti-saturation diode (D1) increases the usable duty
cycle range of the MIC2171 by eliminating the base to
collector stored charge which would delay Q1’s turnoff.
Compensation
Loop stability compensation of the MIC2171 can be accom-
plished by connecting an appropriate network from either
COMP to circuit ground (see typical Applications) or COMP
to FB.
The error amplifier output (COMP) is also useful for soft start
and current limiting. Because the error amplifier output is a
transconductance type, the output impedance is relatively
high which means the output voltage can be easily clamped
or adjusted externally.
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| MIC2171BU TR | 功能描述:IC REG MULTI CONFIG 2.5A TO263-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無(wú) 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| MIC2171WT | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2.5A 100kHz Switching Regulator (ROHS Compliant) 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 |
| MIC2171WU | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2.5A 100kHz Switching Regulator (ROHS Compliant) 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 |
| MIC2171WU TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2.5A 100kHz Switching Regulator (ROHS Compliant) 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 |
| MIC2171WU-TR | 功能描述:Buck, Boost, Cuk, Flyback, Forward Converter Switching Regulator IC Positive or Negative, Isolation Capable Adjustable 1 Output 2.5A (Switch) TO-263-6, D2Pak (5 Leads + Tab), TO-263BA 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 功能:升壓，降壓，升壓/降壓 輸出配置:正或負(fù)，可提供隔離 拓?fù)?降壓，升壓，Cuk，反激，正激轉(zhuǎn)換器 輸出類型:可調(diào)式 輸出數(shù):1 電壓 - 輸入（最小值）:3V 電壓 - 輸入（最大值）:40V 電壓 - 輸出（最小值/固定）:- 電壓 - 輸出（最大值）:65V（開關(guān)） 電流 - 輸出:2.5A（開關(guān)） 頻率 - 開關(guān):100kHz 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C（TA） 安裝類型:表面貼裝 封裝/外殼:TO-263-6，D2Pak（5 引線+接片），TO-263BA 供應(yīng)商器件封裝:TO-263-5 標(biāo)準(zhǔn)包裝:1 |
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