參數(shù)資料
型號(hào)： L4974
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： 3.5A SWITCHING REGULATOR
中文描述： 3.5A的開關(guān)穩(wěn)壓器
文件頁(yè)數(shù)： 3/22頁(yè)
文件大?。?/td> 327K
代理商： L4974
PIN FUNCTIONS
N
o
1
Name
Function
BOOTSTRAP
A C
boot
capacitor connected between this terminal and the output allows to drive
properly the internal D-MOS transistor.
A C
d
capacitor connected between this terminal and ground determines the reset
signal delay time.
Open Collector Reset/power FailSignal Output.This outputis high when the supply
and the outputvoltages aresafe.
Input of Power Fail Circuit. The threshold is 5.1V. It may be connected via a divider
tothe inputforpowerfailfunction.Itmustbe connected tothepin14anexternal30K
resistor when power fail signal not required.
Common Ground Terminal
2
RESET DELAY
3
RESET OUT
4
RESET INPUT
5, 6
15, 16
7
GROUND
FREQUENCY
COMPENSATION
SOFT START
A series RC network connected between this terminal and ground determines the
regulation loop gain characteristics.
SoftStartTime Constant.A capacitor isconnected betweenthi sterminal andground
to define the soft start time constant.
The Feedback Terminal of the Regulation Loop. The output is connected directly to
this terminal for 5.1V operation; It is connected via a divider for higher voltages.
Multiple L4974A’s are synchronized by connecting pin 10 inputs together or via an
external syncr. pulse.
Unregulated Input Voltage.
Not Connected.
5.1V V
ref
Device Reference Voltage.
InternalStart-up Circuit to Drive the PowerStage.
R
osc
. Externalresistorconnected to grounddetermines the constant chargingcurrent
of C
osc
.
C
osc
. External capacitor connected to ground determines (with R
osc
) the switching
frequency.
Regulator Output.
8
9
FEEDBACK INPUT
10
SYNC INPUT
11
SUPPLYVOLTAGE
N.C.
V
ref
V
start
OSCILLATOR
12, 19
13
14
17
18
OSCILLATOR
20
OUTPUT
L4974A
3/22
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L4974A 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5.1 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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
L4974A 制造商:STMicroelectronics 功能描述:IC SWITCHING REG 3.5A 4974 DIP20
L4974AE 制造商:STMicroelectronics 功能描述:
L4975 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5A SWITCHING REGULATOR
L4975A 功能描述:直流/直流開關(guān)調(diào)節(jié)器 5.1 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(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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