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參數(shù)資料
| 型號(hào)： | ZLDO300T8 |
| 英文描述： | Obsolete |
| 中文描述： | 過時(shí) |
| 文件頁數(shù)： | 6/9頁 |
| 文件大小： | 239K |
| 代理商： | ZLDO300T8 |
ZLDO300
1). Simple 3.0V Supply
Using a circuit such as Figure 1, the ZLDO300
can easily provide a 3.0V logic supply from an
available 5V rail where most standard
regulators could not guarantee correct
operation. Although this approach is not
particularly energy efficient, if the load taken at
3.0V is not too large, then the added complexity
and cost of a 3.0V switching converter may not
be justifiable and so this linear solution can be
preferable. This circuit will also give far less
noise than a switching regulator which can be
important when handling low level analogue
signals or low voltage measurements.
2). Post Converter Regulation
A common problem with multiple output
switch mode converters is that only one output
can be used in the feedback control loop of the
switching regulator. Thus only one output is
fully regulated. All other outputs are prone to
tracking errors that occur if the load on any
output changes significantly. By ensuring close
coupling of all transformer windings and
minimising the impedance of all outputs, these
errors can be reduced but never eliminated. A
simple way round this problem is to wind the
switching regulator transformer to give a
slightly higher voltage than required and
regulate down from this to the desired voltage
with a linear regulator. This is indicated in
Figure 2. To keep losses low and so maintain
the advantages of a switch mode supply, it is
important that the voltage drop across this
regulator is kept as low as possible, i.e. just high
enough to compensate for the poor output
impedance of the switching power supply but
no higher. The low dropout voltage of the
ZLDO300 allows this circuit technique to be
implemented very effectively, giving a highly
stable and accurate low noise supply.
APPLICATIONS
Spg
D/C
Vout
LBF
SC
Vin
N/C
Gnd
IC1
C2
C1
C3
+5V In
+5V Out
+3.0V Out
0V Out
0V In
Figure 1
Spg
D/C
Vout
LBF
SC
Vin
N/C
Gnd
ZLDO300
C2
1μF
C1
10pF
+5V Out
0V Out
C4
220μF
220μF
+3.0V Out
TR1
Feedback
Switching
Regulator
Voltage
D1
D2
Figure 2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ZLDO300T8TA | 功能描述:IC REG LDO 3V .3A SOT223-8 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式和可調(diào)式 輸出電壓:3.3V，1.25 V ~ 5.7 V 輸入電壓:4.5 V ~ 7 V 電壓 - 壓降（標(biāo)準(zhǔn)）:1.1V @ 1A 穩(wěn)壓器數(shù)量:2 電流 - 輸出:1A 電流 - 限制（最?。?1A 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-252-5，DPak（4 引線 + 接片），TO-252AD 供應(yīng)商設(shè)備封裝:PPAK 包裝:管件 其它名稱:497-3576-5 |
| ZLDO330 | 制造商:ZETEX 制造商全稱:ZETEX 功能描述:3.3 VOLT ULTRA LOW DROPOUT REGULATOR |
| ZLDO330T8 | 制造商:Diodes Incorporated 功能描述:V REG LDO +3.3V SMD SOIC8 330 制造商:Diodes Incorporated 功能描述:V REG LDO +3.3V, SMD, SOIC8, 330 制造商:Diodes Incorporated 功能描述:IC, LDO REG; Primary Input Voltage:20V; Output Voltage Fixed:3.3V; Dropout Voltage Vdo:30mV; No. of Pins:8; Output Current:300mA; Operating Temperature Min:-40C; Operating Temperature Max:85C ;RoHS Compliant: Yes |
| ZLDO330T8 | 制造商:Diodes Incorporated 功能描述:V REG LDO +3.3V SMD SOIC8 330 |
| ZLDO330T8/TATAPE/REEL | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC-SM LDO VOLT REG +3.3V |
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