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參數資料
| 型號： | L4976 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩壓器 |
| 英文描述： | 2.5 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | LEAD FREE, PLASTIC, DIP-8 |
| 文件頁數： | 1/17頁 |
| 文件大小： | 260K |
| 代理商： | L4976 |
April 2007
Rev 7
1/17
17
L4976
1A step down switching regulator
Features
■ Up to 1A step down converter
■ Operating input voltage from 8v to 55v
■ Precise 5.1V reference voltage
■ Output voltage adjustable from 0.5V to 50V
■ Switching frequency adjustable up to 300kHz
■ Voltage feedforward
■ Zero load current operation
■ Internal current limiting (pulse-bypulse
■ and hiccup mode)
■ Protection against feedback disconnection
■ Thermal shutdown
Description
The L4976 is a step down monolithic power
switching regulator delivering 1A at a voltage
between 3.3V and 50V (selected by a simple
external divider). Realized in BCD mixed
technology, the device uses an internal power D-
MOS transistor (with a typical Rds(ON) of 0.25) to
obtain very high efficency and high switching
speed. A switching frequency up to 300KHz is
achievable (the maximum power dissipation of the
packages must be observed). A wide input
voltage range between 8V to 55V and output
voltages regulated from 3.3V to 40V cover the
majority of today’s applications. Features of this
new generations of DC-DC converter include
pulse-by-pulse current limit, hiccup mode for short
circuit protection, voltage feedforward regulation,
protection against feedback loop disconnection
and thermal shutdown. The device is available in
plastic dual in line, MINIDIP 8 for standard
assembly, and SO16W for SMD assembly.
DIP8
SO16W
Figure 1.
Typical application circuit
5
2
8
4
1
L4976
C1
220
F
63V
C8
330
F
VO=3.3V/1A
Vi=8V to 55V
R1
20K
C2
2.7nF
R2
9.1K
C4
22nF
3
7
L1
260
H
(77120)
6
D1
GI
SB360
C7
220nF
C6
100nF
相關PDF資料 |
PDF描述 |
|---|---|
| L4976D013TR | 2.5 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO16 |
| L4977A | 11 A SWITCHING REGULATOR, 500 kHz SWITCHING FREQ-MAX, PZFM15 |
| L4978D013TR | 3.5 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO16 |
| L4978 | 3.5 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDIP8 |
| L497B | SPECIALTY ANALOG CIRCUIT, PDIP16 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| L4976(D) | 制造商:STMicroelectronics 功能描述:Bulk |
| L4976_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:1A step down switching regulator |
| L4976D | 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 |
| L4976D013TR | 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 |
| L4977 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Mode SMPS Controller |
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