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參數(shù)資料
| 型號： | L4974A |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5.5 A SWITCHING REGULATOR, 200 kHz SWITCHING FREQ-MAX, PDIP20 |
| 封裝： | POWER, PLASTIC, DIP-20 |
| 文件頁數(shù)： | 16/22頁 |
| 文件大?。?/td> | 6679K |
| 代理商： | L4974A |
PIN FUNCTIONS
N
o
Name
Function
1
BOOTSTRAP
A Cboot capacitor connected between this terminal and the output allows to drive
properly the internal D-MOS transistor.
2
RESET DELAY
A Cd capacitor connected between this terminal and ground determines the reset
signal delay time.
3
RESET OUT
Open Collector Reset/power Fail Signal Output. This output is high when the supply
and the output voltages are safe.
4
RESET INPUT
Input of Power Fail Circuit. The threshold is 5.1V. It may be connected via a divider
to the input for power fail function. It must be connected to the pin 14 an external 30K
resistor when power fail signal not required.
5, 6
15, 16
GROUND
Common Ground Terminal
7
FREQUENCY
COMPENSATION
A series RC network connected between this terminal and ground determines the
regulation loop gain characteristics.
8
SOFT START
Soft Start Time Constant. A capacitor is connected between thi sterminal and ground
to define the soft start time constant.
9
FEEDBACK INPUT
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.
10
SYNC INPUT
Multiple L4974A’s are synchronized by connecting pin 10 inputs together or via an
external syncr. pulse.
11
SUPPLY VOLTAGE
Unregulated Input Voltage.
12, 19
N.C.
Not Connected.
13
Vref
5.1V Vref Device Reference Voltage.
14
Vstart
Internal Start-up Circuit to Drive the Power Stage.
17
OSCILLATOR
Rosc. External resistor connected to ground determines the constant charging current
of Cosc.
18
OSCILLATOR
Cosc. External capacitor connected to ground determines (with Rosc) the switching
frequency.
20
OUTPUT
Regulator 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 | 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 |
| L4975A | 制造商:STMicroelectronics 功能描述:SWITCHING REG 5A 4975 MULTIWATT15 |
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