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參數資料
| 型號： | L4974A |
| 廠商： | 意法半導體 |
| 英文描述： | Power Switching Regulator(功率開關穩壓器) |
| 中文描述： | 電源開關穩壓器（功率開關穩壓器） |
| 文件頁數： | 1/22頁 |
| 文件大小： | 378K |
| 代理商： | L4974A |
L4974A
January 1995
3.5A SWITCHINGREGULATOR
.
3.5A OUTPUT CURRENT
.
5.1V TO40V OUTPUT VOLTAGERANGE
.
0 TO90% DUTY CYCLE RANGE
.
INTERNAL FEED-FORWARD LINEREG.
.
INTERNAL CURRENT LIMITING
.
PRECISE 5.1V
±
2%ON CHIP REFERENCE
.
RESET AND POWER FAIL FUNCTIONS
.
INPUT/OUTPUT SYNCPIN
.
UNDER VOLTAGE LOCK OUT WITH HYS-
TERETIC TURN-ON
.
PWM LATCH FOR SINGLE PULSE PER PE-
RIOD
.
VERY HIGH EFFICIENCY
.
SWITCHING FREQUENCY UP TO 200KHz
.
THERMAL SHUTDOWN
.
CONTINUOUS MODE OPERATION
DESCRIPTION
TheL4974Aisastepdownmonolithicpowerswitch-
ing regulator delivering 3.5A at a voltage variable
from5.1 to 40V.
Realized with BCD mixed technology, the device
uses a DMOS output transistorto obtain very high
efficiencyandveryfastswitching times. Featuresof
BLOCK DIAGRAM
POWERDIP
(16 + 2 + 2)
the L4974Ainclude reset and power fail for micro-
processors, feed forward line regulation, soft start,
limiting current and thermal protection. The device
is mountedinaPowerdip16+ 2+2 plasticpackage
and requires few external components. Efficient
operationatswitchingfrequenciesup to200KHzal-
lows reductionin the size andcost of externalfilter
component.
ORDERING NUMBER :
L4974A
1/22
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
MULTIPOWER BCD TECHNOLOGY
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 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/直流開關調節器 5.1 to 40V Step-Down RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格: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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