LM317T datasheet(4/11 Pages) STMICROELECTRONICS

tên linh kiện	LM317T

Giải thích chi tiết về linh kiện	1.2V TO 37V VOLTAGE REGULATOR

Download	11 Pages

Scroll/Zoom	100%

nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

Trang chủ	http://www.st.com

Logo

4 / 11 page

APPLICATION INFORMATION

The

LM117/217/317

provides

an

internal

reference voltage of 1.25V between the output

and adjustments terminals. This is used to set a

constant current flow across an external resistor

divider (see fig. 4), giving an output voltage VO of:

VO =VREF

(1 +

R2

R1

) +IADJ R2

The device was designed to minimize the term

IADJ (100

µA max) and to maintain it very constant

with line and load changes. Usually, the error

term IADJ

⋅ R2 can be neglected. To obtain the

previous requirement, all the regulator quiescent

current is returned to

the output terminal,

imposing a minimum load current condition. If the

load is insufficient, the output voltage will rise.

Since the LM117/217317 is a floating regulator

and ”sees” only the input-to-output differential

voltage, supplies of very high voltage with respect

to ground can be regulated as long as the

maximum

input-to-output

differential

is

not

exceeded. Furthermore, programmable regulator

are easily obtainable and, by connecting a fixed

resistor between the adjustment and output, the

device can be used as a precision current

regulator.

In order to optimise the load regulation, the

current set resistor R1 (see fig. 4) should be tied

as close as possible to the regulator, while the

ground terminal of R2 should be near the ground

of the load to provide remote ground sensing.

Performance may be improved with added

capacitance as follow:

An input bypass capacitor of 0.1

µF

An adjustment terminal to ground 10

µF capacitor

Figure 4 : Basic Adjustable Regulator.

Figure 1 : Output Current vs. Input-output

Differential Voltage.

Figure 2 : Dropout Voltage vs. Junction

Temperature.

Figure 3 : Reference Voltage vs. Junction

LM117/217/317

4/11

Số phần tương tự - LM317T

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
National Semiconductor ...	LM317T	645Kb / 25P	3-Terminal Adjustable Regulator
ON Semiconductor	LM317T	172Kb / 12P	1.5 A Adjustable Output, Positive Voltage Regulator October, 2011 ??Rev. 12
ON Semiconductor	LM317T	132Kb / 12P	1.5 A Adjustable Output, Positive Voltage Regulator January, 2002 ??Rev. 3
Comset Semiconductor	LM317T	96Kb / 2P	3-Terminal Positive Adjustable Regulators
Fairchild Semiconductor	LM317T	67Kb / 6P	Adjustable Voltage Regulator (Positive)

More results

Mô tả tương tự - LM317T

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
E-Tech Electronics LTD	LM317A	254Kb / 5P	MEDIUM CURRENT 1.2V TO 37V ADJUSTABLE VOLTAGE REGULATOR
Unisonic Technologies	LM317A	301Kb / 6P	MEDIUM CURRENT 1.2V TO 37V ADJUSTABLE VOLTAGE REGULATOR
	LM317M	251Kb / 5P	MEDIUM CURRENT 1.2V TO 37V ADJUSTABLE VOLTAGE REGULATOR
	LM317M	299Kb / 5P	MEDIUM CURRENT 1.2V TO 37V ADJUSTABLE VOLTAGE REGULATOR
	LM317M	254Kb / 5P	MEDIUM CURRENT 1.2V TO 37V ADJUSTABLE VOLTAGE REGULATOR
	LM317A	256Kb / 5P	MEDIUM CURRENT 1.2V TO 37V ADJUSTABLE VOLTAGE REGULATOR
	LM317A	227Kb / 5P	MEDIUM CURRENT 1.2V TO 37V ADJUSTABLE VOLTAGE REGULATOR
E-Tech Electronics LTD	LM317M	254Kb / 5P	MEDIUM CURRENT 1.2V TO 37V ADJUSTABLE VOLTAGE REGULATOR
STMicroelectronics	LM217L	130Kb / 8P	LOW CURRENT 1.2V TO 37V ADJUSTABLE VOLTAGE REGULATOR February 2003
Unisonic Technologies	LM317M	292Kb / 5P	MEDIUM CURRENT 1.2V TO 37V ADJUSTABLE VOLTAGE REGULATOR

More results

LM317T bảng dữ liệu(PDF) 4 Page - STMicroelectronics

LM317T bảng dữ liệu(HTML) 4 Page - STMicroelectronics

Số phần tương tự - LM317T

Mô tả tương tự - LM317T

Html Pages

1 2 3 4 5 6 7 8 9 10 11

bảng dữ liệu tải về

Link URL