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參數資料
| 型號： | L4977A |
| 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： | 1/21頁 |
| 文件大小： | 287K |
| 代理商： | L4977A |
L4977A
7A SWITCHING REGULATOR
7A OUTPUT CURRENT
5.1V TO 40V OUTPUT VOLTAGERANGE
0 TO 90% DUTY CYCLE RANGE
INTERNAL FEED-FORWARD LINE REGULA-
TION
INTERNAL CURRENT LIMITING
PRECISE 5.1V
±
2% ON CHIP REFERENCE
RESETAND POWER FAIL FUNCTIONS
SOFT START
INPUT/OUTPUT SYNC PIN
UNDER VOLTAGE LOCK OUT WITH HYS-
TERETIC TURN-ON
PWM LATCH FOR SINGLE PULSE PER PE-
RIOD
VERY HIGH EFFICIENCY
SWITCHING FREQUENCY UP TO 500KHz
THERMAL SHUTDOWN
CONTINUOUS MODE OPERATION
DESCRIPTION
The L4977A is a stepdown monolithic power
switching regulator delivering 7A at a voltagevari-
able from 5.1 to 40V.
Realized with BCD mixed technology, the device
uses a DMOSoutput transistorto obtain very high
efficiency and very fast switching times. Features
of the L4977A include reset and power fail for mi-
croprocessors, feed forward line regulation, soft
start, limiting current and thermal protection. The
device is mounted in a 15-lead multiwatt plastic
power package and requires few external compo-
nents. Efficient operation at switching frequencies
up to 500KHz allows reduction in the size and
costof external filter components.
This isadvanced information on anew product now in development or undergoing evaluation. Details are subject to change without notice.
November 1991
BLOCK DIAGRAM
Multiwatt15V
ORDERING NUMBER:
L4977A
MULTIPOWER BCD TECHNOLOGY
1/21
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相關代理商/技術參數 |
參數描述 |
|---|---|
| L4977HT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Mode SMPS Controller |
| L4978 | 功能描述:直流/直流開關調節器 3.3 to 50V 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 |
| L4978_05 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2A STEP DOWN SWITCHING REGULATOR |
| L4978D | 功能描述:直流/直流開關調節器 3.3 to 50V 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 |
| L4978D013TR | 功能描述:直流/直流開關調節器 3.3 to 50V 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 |
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