LS1240A现货热卖使用介绍供应商报价哪里找芯片批发报价-中国IC网-芯三七

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产品型号LS1240A的概述

LS1240A芯片概述 LS1240A是一款高性能的线性调节器芯片，广泛应用于电源管理系统中。作为一种集成电路（IC），LS1240A旨在为电子设备提供稳定的电压输出，与各种电源管理方案兼容。由于其设计具有高效率与低功耗特性，该芯片在通信、电源和消费电子等领域都找到了广泛的应用。 LS1240A的设计注重电压稳定输出和负载调节能力，能够适应各种工作环境。在现代电子产品中，对电源的需求愈发多样化和复杂，LS1240A作为一种可靠的选择，得到了设计师的青睐。 LS1240A的详细参数 LS1240A拥有多项核心参数，使其在电源管理应用中表现出色。以下是该芯片的一些关键指标： - 输入电压范围：4.5V到40V - 输出电压：固定输出值通常为5V、12V等，具体输出需根据型号而定 - 输出电流：最大输出电流可达1.5A - 温度范围：工作温度在-40°C至+85°C之间 - 短路保护：内置短...

产品型号LS1240A的Datasheet PDF文件预览

LS1240A

ELECTRONIC TWO - TONE RINGER

LOW CURRENT CONSUMPTION, IN ORDER

TO ALLOW THE PARALLEL OPERATION OF 4

DEVICES

INTEGRATED RECTIFIER BRIDGE WITH

ZENER DIODES TO PROTECT AGAINST

OVERVOLTAGES

LITTLE EXTERNAL CIRCUITRY

TONE AND SWITCHING FREQUENCIES AD-

JUSTABLE BY EXTERNAL COMPONENTS

INTEGRATED VOLTAGE AND CURRENT

HYSTERESIS

Minidip

DESCRIPTION

LS1240A is a monolithic integrated circuit designed

to replace the mechanical bell in telephone sets in

connection with an electro-acoustical converter. It

can drive directly a piezoceramic converter (buzz-

er)or a dynamic loudspeaker.

SO8

The output current capability of LS1240A is higher

than standard ringer. For driving a dynamic loud-

speaker LS1240A can simply use a decoupling ca-

pacitor, thus eliminating the usual transformer.

ORDERING NUMBERS

No current limitation is provided on the output stage

of LS1240A, so a minimum load DC of 50 Ω is ad-

viced, in series with a proper capacitor.

Minidip

SO8

LS1240A

LS1240AD1

The two tone frequencies generated are switched

by an internal oscillator in a fastsequence and made

audible across an output amplifier in the loud-

speaker, both tone frequencies and the switching

frequency can be externally adjusted.

The supply voltage is obtained from the AC ring sig-

nal and the circuit is designed so that noise on the

line or variations of the ringing signal cannot affect

correct operation of the device.

PIN CONNECTION (top view)

1/7

July 1998

LS1240A

BLOCK DIAGRAM

Figure 1 : Test Circuit.

2.72 10⁴

R1 =

1943

750

C1 (nF)

1 − 0.04 ln

f2 = 0.725 f1

f_SWEEP=

(

)

f1 (Hz)

2/7

LS1240A

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

120

Unit

V_rms

°C

V_AB

T_op

T_stg

Calling Voltage (f = 50 Hz) Continuous

Calling Voltage (f = 50 Hz) 5s ON/10s OFF

Supply Current

200

Operating Temperature

– 40 to + 70

– 65 to + 150

Storage and Junction Temperature

°C

THERMAL DATA

Symbol

Parameter

Value

Unit

R_{th j-amb}

Thermal Resistance Junction-ambient

Max

100

°C/W

ELECTRICAL CHARACTERISTICS

(T_amb= 25 °C; V_s= applied between pins 7-2 unless otherwise specified)

Symbol

V_s

Parameter

Test Conditions

Min. Typ. Max. Unit

Supply Voltage

1.8

13.2

I_B

Current Consumption without Load (pins 8-1)

Activation Voltage

V_8-1= 9.3 to 25 V

1.5

V_ON

V_OFF

R_D

12.2

Sustaining Voltage

Differential Resistance in OFF Condition (pins 8-1)

Output Voltage Swing

6.4

kΩ

V_OUT

I_OUT

V_s– 5

Short Circuit Current (pins 5-2)

V_s= 20V R_L= 250Ω

AC OPERATION

Output Frequencies

kHz

V_s= 26V, R₁= 14kΩ

V_s= 0 V

V_s= 6V

f₁

f₂

f_out1

1.74

1.22

2.14

1.6

f_out2

f_OUT1

f_OUT2

1.33

1.43

Programming Resistor Range

Sweep Frequency

kΩ

f_SWEEP

5.25

7.5

9.75

R₁= 14kΩ, C₁= 100nF

3/7

LS1240A

Figure 2 : Typical Application with BUZZER

Figure 3 : Typical Application with Loudspeaker (no transformer needed)

C₁such that Z_LOAD> 1 ΚΩ

4/7

LS1240A

MINIDIP PACKAGE MECHANICAL DATA

inch

TYP.

0.131

DIM.

MIN.

TYP.

MAX.

MIN.

MAX.

3.32

0.51

1.15

0.020

0.045

0.014

0.008

1.65

0.55

0.065

0.022

0.012

0.430

0.384

0.356

0.204

0.304

10.92

9.75

7.95

0.313

2.54

7.62

0.100

0.300

6.6

0.260

0.200

0.150

0.060

5.08

3.81

1.52

3.18

0.125

5/7

LS1240A

SO8 PACKAGE MECHANICAL DATA

inch

TYP.

DIM.

MIN.

TYP.

MAX.

1.75

0.25

1.65

0.85

0.48

0.25

0.5

MIN.

MAX.

0.069

0.010

0.065

0.033

0.019

0.010

0.020

0.1

0.004

0.65

0.35

0.19

0.25

0.026

0.014

0.007

0.010

D (1)

45° (typ.)

4.8

5.8

5.0

6.2

0.189

0.228

0.197

0.244

1.27

3.81

0.050

0.150

F (1)

3.8

0.4

4.0

1.27

0.6

0.15

0.157

0.050

0.024

0.016

8° (max.)

6/7

LS1240A

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the conse-

quences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No

license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this

publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMi-

croelectronics products are not authorized for use as critical components in life support devices or systems without express written

approval of STMicroelectronics.

The ST logo is a registered trademark of STMicroelectronics

STMicroelectronics GROUP OF COMPANIES

Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands -

Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.

7/7

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LS1240A产品参数

型号:	LS1240A
是否Rohs认证：	不符合
生命周期：	Obsolete
IHS 制造商：	SGS-ATES COMPONENTI ELECTRONICI S P A
包装说明：	DIP, DIP8,.3
Reach Compliance Code：	unknown
风险等级：	5.88
Is Samacsys：	N
JESD-30 代码：	R-PDIP-T8
JESD-609代码：	e0
端子数量：	8
最高工作温度：	70 °C
最低工作温度：	-20 °C
封装主体材料：	PLASTIC/EPOXY
封装代码：	DIP
封装等效代码：	DIP8,.3
封装形状：	RECTANGULAR
封装形式：	IN-LINE
认证状态：	Not Qualified
子类别：	Telephone Circuits
表面贴装：	NO
温度等级：	COMMERCIAL
端子面层：	Tin/Lead (Sn/Pb)
端子形式：	THROUGH-HOLE
端子节距：	2.54 mm
端子位置：	DUAL
Base Number Matches：	1

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