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參數(shù)資料
| 型號(hào)： | L4963W |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Isolated Flyback Switching Regulator with 9V Output |
| 中文描述： | 隔離反激式開(kāi)關(guān)穩(wěn)壓9V輸出 |
| 文件頁(yè)數(shù)： | 4/17頁(yè) |
| 文件大小： | 178K |
| 代理商： | L4963W |
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CIRCUIT DESCRIPTION (Refer to Block Dia-
gram)
The L4963 is a monolithicstepdownregulatorpro-
viding 1.5A at 5.1V working in discontinuous vari-
able frequency mode. In normal operation the
deviceresonatesata frequencydependingprimar-
ily on the inductance value, the input and output
voltageand theloadcurrent.The maximumswitch-
ing howevercan be limited byan internaloscillator,
which can be programmed by only one external
resistor.
The fondamental regulation loop consists of two
comparators, a precision 5.1V on-chip reference
anda drivelatch.Brieflytheoperationis asfollows:
when the choke ends its discharge the catch free-
wheeling recirculation filter diode begins to come
out of forward conduction so the output voltage of
the device approaches ground. When the output
voltagereaches–0.1Vtheinternalcomparatorsets
the latch and the power stage is turned on. Then
the inductor current rises linearly until the voltage
sensed at the feedback input reaches the 5.1V
reference.
The second comparator then resets the latch and
the output stage is turned off. The current in the
choke falls linearly until it is fully discharged, then
thecyclerepeats.Closingtheloop directlygivesan
output voltage of 5.1V.Higher output voltages are
obtained by inserting a voltage divider and this
method of control requires no frequencycompen-
sation network. At output voltages greater than
5.1V the available output current must be derated
due to the increased power dissipation of the de-
vice.
Output overload protectionis providedby an inter-
nal current limiter. The load current is sensedby a
on-chip metal resistor connected to a comparator
whichresetsthelatchandturnsoffthe powerstage
in overloadcondition.The reset circuits (seefig. 1)
generates an output high signal when the output
voltage value is correct. It has an open collector
output and the output signal delay time can be
programmed with an external capacitor. A power-
fail circuit is also available and is used to monitor
the supply voltage. Its output goes high when the
supplyvoltagereachesapre-programmedtreshold
set by a voltage divider to its input from the supply
to ground.With the input left open the thresholdis
approximately equal to 5.1V. The output of the
power fail is an open collector.
ATTLlevel inhibit is provided forapplicationssuch
as remote on/off control. This input is activated by
a low logic level and disablescircuits operation.
The thermal overload circuit disables the device
when the junctiontemperatureis about150
°
C and
has hysteresisto prevent unstableconditions.
Figure1:
Reset and PowerFail Function
L4963 - L4963D
4/17
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| L4964 | 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 5.1 to 28V 4.0 Amp RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)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 |
| L4964_03 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH CURRENT SWITCHING REGULATOR |
| L4964HT | 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 5.1 to 28V 4.0 Amp RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)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 |
| L4969 | 功能描述:低壓差穩(wěn)壓器 - LDO Triple w/Lo-Spd Tran RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| L4969013TR | 功能描述:低壓差穩(wěn)壓器 - LDO Triple w/Lo-Spd Tran RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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