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參數(shù)資料
| 型號： | L4962EH |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 5/15頁 |
| 文件大?。?/td> | 212K |
| 代理商： | L4962EH |
CIRCUITOPERATION
(referto the block diagram)
TheL4962isamonolithicstepdownswitchingregu-
latorprovidingoutputvoltagesfrom5.1Vto40Vand
delivering 1.5A.
The regulation loop consists of a sawtoothoscilla-
tor, error amplifier, comparator and the output
stage.Anerrorsignalis producedbycomparingthe
output voltage with a precise 5.1V on-chip refer-
ence (zenerzap trimmed to
±
2%).
Thiserrorsignalisthencomparedwiththesawtooth
signal to generate the fixed frequency pulse width
modulatedpulses which drive the output stage.
The gain and frequencystabilityof theloop can be
adjusted by an external RC network connected to
pin 11. Closing the loop directly gives an output
voltage of 5.1V. Higher voltages are obtained by
inserting a voltagedivider.
Output overcurrents at switchon are preventedby
the soft start function.The error amplifier output is
initially clamped by the external capacitor C
ss
and
allowedto rise, linearly,asthis capacitoris charged
by a constantcurrent source. Output overloadpro-
tection is provided in the form of a current limiter.
The load current is sensed by an internal metal
resistorconnectedto a comparator.When the load
current exceedsa presetthresholdthis comparator
sets a flipflop which disables the output stage and
discharges the soft startcapacitor. Asecond com-
parator resets the flip flop when the voltage across
the soft start capacitorhas fallento 0.4V.
The output stage is thus re-enabledand theoutput
voltagerises undercontrolof the softstartnetwork.
If the overload condition is still present the limiter
will trigger again when the threshold current is
reached.The averageshort circuitcurrentis limited
to a safevalue by the dead time introducedby the
soft start network.The thermal overload circuit dis-
ables circuit operation when the junction tempera-
ture reaches about 150
°
C and has hysteresis to
prevent unstableconditions.
Figure 1. Softstart waveforms
Figure 2. Current limiter waveforms
5/15
L4962
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L4962EH/A | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5.0 to 40V Step-Down 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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L4963 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1.5A SWITCHING REGULATOR |
| L4963D | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5.1 to 36V 1.5 Amp 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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L4963D013TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5.1 to 36V 1.5 Amp 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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L4963W | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5.1 to 36V 1.5 Amp 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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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