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參數資料
| 型號： | L4971D |
| 廠商： | 意法半導體 |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Isolated Flyback Switching Regulator with 9V Output |
| 中文描述： | 隔離反激式開關穩壓9V輸出 |
| 文件頁數： | 1/12頁 |
| 文件大?。?/td> | 134K |
| 代理商： | L4971D |
UP TO 1.5A STEP DOWN CONVERTER
OPERATING INPUT VOLTAGE FROM 8V TO
55V
PRECISE 3.3V (
±
1%) INTERNAL REFER-
ENCE VOLTAGE
OUTPUT VOLTAGE ADJUSTABLE FROM
3.3VTO 50V
SWITCHING FREQUENCY ADJUSTABLE UP
TO 500KHz
VOLTAGEFEEDFORWARD
ZEROLOAD CURRENT OPERATION
INTERNAL CURRENT LIMITING (PULSE-BY-
PULSEAND HICCUPMODE)
INHIBIT FOR ZERO CURRENT CONSUMP-
TION
PROTECTION AGAINST FEEDBACK DIS-
CONNECTION
THERMAL SHUTDOWN
SOFTSTART FUNCTION
DESCRIPTION
The L4971 is a step down monolithic power
switching regulator delivering 1.5A at a voltage
between3.3V and 50V (selected by a simple ex-
ternal divider). Realized in BCD mixed technol-
ogy, the device uses an internal power D-MOS
transistor (with a typical Rdson of 0.25
) to ob-
tain very high efficencyand high switching speed.
A switching frequency up to 500KHz is achiev-
able (the maximum power dissipation of the pack-
ages must be observed).
A wide input voltage range between 8V to 55V
and output voltages regulated from 3.3V to 50V
cover the majority of today’sapplications.
Features of this new generations of DC-DC con-
verter include pulse-by-pulse current limit, hiccup
mode for short circuit protection, voltage feedfor-
ward regulation, soft-start, protection against
feedback loop disconnection, inhibit for zero cur-
rent consumptionand thermalshutdown.
The device is available in plastic dual in line,
MINIDIP 8 for standard assembly, and SO16W
for SMD assembly.
May 2000
ORDERING NUMBERS:
L4971 (Minidip)
L4971D (SO16)
L4971
1.5A STEP DOWN SWITCHING REGULATOR
Minidip
SO16W
D97IN748A
5
2
8
4
1
L4971
C
1
220
μ
F
63V
C
8
330
μ
F
V
O
=3.3V/1.5A
Vi=8V to 55V
R
1
20K
C
2.7nF
R
9.1K
C
22nF
3
7
L1
126
μ
H
(77120)
6
D1
GI
SB360
C
100nF
C
220nF
C
100nF
TYPICAL APPLICATION CIRCUIT
1/12
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相關代理商/技術參數 |
參數描述 |
|---|---|
| L4971D013TR | 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 |
| L4972 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2A SWITCHINGREGULATOR |
| L4972A | 功能描述:直流/直流開關調節器 5.1 to 40V 2.0 Amp 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 |
| L4972A | 制造商:STMicroelectronics 功能描述:IC SWITCHING REG 2A 4972 DIP20 |
| L4972A_05 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:2A SWITCHING REGULATOR |
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