Constant current laser driver ATLS6A201D

Constant current laser driver ATLS6A201D is a kind of electronic modules designed for driving laser diode with up to 6A constant current, as shown in the Figure 1. This laser driver has high efficiency, low noise, high reliability, zero EMI, small package and some other advantages. There are many functions as follows: laser current control and monitoring, over temperature protection, great loop indication, laser diode status indication, soft start and shut down. What’s more, this laser driver comes with 2.5V reference voltage with high stability and low noise, which can be used as the reference of ADCs and DACs. 2.5V reference can set the output current by setting the voltage of LIS.

Figure 1. The photo of an actual laser driver ATLSA201D

Because of using a 6 sided metal enclosure, laser driver ATLS6A201D can shield electromagnetic interference and avoid the interferences between laser driver and other electronics

If this laser driver is not suitable to you, there are some other laser drivers available for selection and we (ATI) can also customize a specified laser driver for you. Beyond that, we design and produce other drivers or controllers for TEC, LED and so on..

If you want to know about our laser divers or some other products, please contact us.
Our web site is http://www.analogtechnologies.com/ATLSXA201D.html

Evaluation board for laser driver ATLS201B

Laser driver ATLS201D designed for driving laser diode has high efficiency (more than 90%), low noise, high reliability, zero EMI, small package and some other advantages. Laser driver ATLS201D series include ATLS2A201D, ATLS3A201D,ATLS4A201D and ATLS6A201D. They can be plugged in an evaluation board ATLSXA201DEV1.0, as shown in the Figure 1.

Figure 1. The physical photo of laser driver evaluation board ATLSXA201DEV1.0.

By using ATLSXA201DEV1.0, it is more convenient for customers to use laser drivers. This evluation board made of a complete application circuit can be utilized to set and monitor the output current and there is an LED indicating drving status. By using the programmable current of the laser driver, it can drive a voltage configurable and dummy laser driver. Before using laser driver and evaluation, it is recommended to read their datasheets at the same time, which can provide more detail application notes for customers.

If you want to know more about laser drivers and evaluation board, please contact us. We will be happy to service you.
Our web site
http://www.analogtechnologies.com/Evaluation_Board_for_Constant_Current_Laser_Driver_ATLSXA201D.html

Temperature window TEC controller

Temperature window TEC controller is an electronic module with small package, which is designed for driving thermoelectric coolers (TECs) with high energy efficiency, high stability and zero EMI. This laser driver can stabilize temperature within pre-set temperature window range and it also provides interface ports for customers to set the desired object temperature (within 10 °C~ 40 °C), the maximum output temperature and compensation network. 

Figure 1. The photo of actual ATW3A314D

ATW3A314D is a kind of temperature window controller, which has high efficiency, more than90%, as shown in the Figure 1. This type controller is designed for regulating the object temperature within the range of the pre-set temperature, so it can be used to monitor the actual object temperature.It is completely shielded, so there is no EMI. The switching frequency of this controller is synchronized to an external signal. There are two types of packages available for selection, DIP and SMT packages. 

If you want to know more, please contact us.

Our web site is http://www.analogti.com/atw3a314d.html

Dual mode laser driver

Laser driver placed in front of the optical emission is designed for biasing and modulating laser, i.e. it converts high speed voltage signal into high speed current signal to modulate laser. In order to meet different design requirements, our company (ATI) has released many kinds of laser drivers, such as ultra-low noise laser driver, high efficiency laser driver, dual mode laser driver and so on. Next, dual mode laser driver will be introduced in details. 

Figure 1. The photo of LDA1-CP1

LDA1-CP2 is an electronic module designed for driving N type laser diode, which has controllable driving current and laser output power. The power efficiency of PWM is 90%, and there is no need for heat sink. The output current and laser power can be set linearly by two separate input voltages, and at the same time, they can also accept the linear monitoring of the two voltages respectively. It comes with 2.5V reference voltage with high stability and low noise. The reference voltage can be utilized to set output current, and it can be also used as the reference voltage of ADC (analog to digital converter) and DAC (digital to analog converter). Because of being packaged in a six sided metal enclosure, LDA1-CP2 can be shielded completely and avoid the interferences between the driver and other electronics. 

If you want to know more about laser drivers or controllers, please contact us.

Our web site is

http://www.analogtechnologies.com/constant_current_and_constant_power_laser_driver_lda1_ cp2.html

Evaluation board for TECA1-5V-5V-D

TECA1-5V-5V-D without internal compensation network is designed for driving thermoelectric cooler (TEC) with 2A ultra low noise current. When it is powered with 5V power supply, the output voltage is from 0V to 5V. In order to use TEC controller more easily, our company (ATI) has released an evaluation board TECEV104. 

TECEV104 is made of a complete tuning and function circuit to drive TEC. Figure 1 is the physical photo of TECEV104. It not only can set the limit of output current and tune compensation network, but also set the internal temperature. It comes with an LED to indicate the temperature status of TEC. 

Figure 1. The photo of TECEV104

TECA1-5V-5V-D is plugged in the center of the evaluation board. Pin voltages can be measured directly by probing connecting holes located on the left and right side of the module socket. Some of the pins can be connected with two holes on the evaluation board. The names of all the nodes are shown on the board. It is recommended to read this datasheet with the TECA1-5V-5V-D datasheet, so that it is more convenient to know the details about TEC controller module. 

If you want to know more, please contact us.

Our web site is 

http://www.analogtechnologies.com/Evaluation_Board_TECEV104.html

TEC controller TECA1-XV-XV-D

TEC controller is applied to drive TEC, which is used to heat and cool objects. Our company (ATI) specializes in researching and designing TEC controller with high stability, high reliability, high energy efficiency, low noise and small package.  Our TEC controller is designed for driving TEC (thermoelectric cooler). It can be used for temperature control in laser system and some other temperature control systems.

Figure 1. The photo of TECA1-XV-XV-D

TECA1-XV-XV-D is a kind of our TEC controllers, which is a small electronic module. Its physical photo is shown in Figure1. It has high energy efficiency, more than 90%. The maximum output current is 2.5A. It can provide many interface ports for users to set set-point temperature, the maximum output voltage and compensation network. What’s more, this controller has many functions, such as thermistor T-R curve linearization, temperature measurement and monitoring, and so on.

We also design an evaluation board for TEC controller. The evaluation board is made of a complete adjustable compensation network and application circuit. It is more convenient for customers to use TEC controller.

If you want to know more about TEC controller or some other related products, please contact us.
Our web site is http://www.analogtechnologies.com/tec-controller.html

Peltier controller TEC5V4A-D

TEC controller is widely applied in temperature control system these years. TEC controller is also called peltier controller, which can regulate the temperature of the thermal load, i.e. cool down or heat up, depending on the current direction through the two terminals of the TEC.

Multiple types of TEC controllers are provided in Analog Technologies, Inc. We are going to focus on one TEC controller,TEC5V4A-D It features high efficiency, higher than 90%. The maximum output current is 4A. With high reliability and stability, this TEC controller can drive TECs to regulate the object temperature.

There is a physical photo of this TEC controller in Figure 1. As we can see, it has a compact size: 20×25.6mm and 16 pins with different functions. The TEC controller is packaged in a 6 sided metal enclosure, which prevents the controller from interfering with other electronics.

This TEC controller has two compensation network versions; one is with internal compensation network and the other without it. The latter TEC controller can use an external compensation network, which is composed of two capacitors and three resistors.

Figure 1. The physical photo of laser driver TEC5V4A-D

If you want to know more about our laser drivers, please visit our website:
http://www.analogtechnologies.com/TEC5V4A-D.html

Laser driver ATLS1A103

Our company (ATI) has been establishedfor about 20 years. We specialize in designing and producing laser drivers/controllers,thermoelectric cooler controller and some other high-tech electronic products. All our products meet standard requirements and also have high reliability, high stability and long service lifetime. What’s more, we can also customize according to your requirements.

Next, I will introduce one of our products, laser driver.

Our laser drivers are used to driver diode laser. There are kinds of laser drivers, such as low noise low current, high efficiency medium current, AC input high current high efficiency, high current short pulsed, etc. Take ATLS1A103 as an example. This diver is an ultra-low noise laser driver.

The physical photo of laser driver

 Since the maximum power consumption of this laser driver is less than 1W, no heat sink is required by this laser driver. This laser driver comes with a temperature compensation network, so the output current keeps the same as the temperature rises of the controller. There is also a protection circuit inside the laser driver, so it will shut down itself when the laser driver temperature is higher than a limit, 120°C. This will prevent the laser driver from being overheated and damaged.

If you want to know more, please contact us.
Our web site ishttp://www.analogtechnologies.com/ATLS_XXX_103.html

Constant Current Laser Driver

Analog Technologies, Inc is focusing on providing high quality electronic products, such as laser drivers/controllers, TEC controllers/Peltier controllers, TEC module/Peltier module, low cost and highly stable NTC thermistor, SMT resistor/capacitor/inductor kits, and heat sinks, etc. Laser driver is one of our major products, which have been in the market for over 20 years.

Constant current laser driver ATLSXA201D is a popular laser driver designed for driving diode lasers efficiently and reliably. The efficiency is over 90%. It outputs constant current, with maximum current value of 1A, 2A, 3A, 4A, and 6A. The stability is 100 ppm/°C

Unlike other heavy and large laser driver, this laser driver comes with a compact size: 20×25.8mm, which can be easily fitted in your laser system. It has through hole mount, also called DIP (Dual Inline package).

An evaluation board is also provided by us, which is designed for evaluating ATLSXA201D conveniently. The main purpose is to evaluate the laser driver without taking the risk of damaging the real diode lasers.

All our products are 100% lead free and comes with RoHS Complaint.

The physical photo of laser driver ATLSXA201D

If you want to know more about our laser drivers, please visit our website:
http://www.analogtechnologies.com/ATLSXA201D.html

How to improve the processing performance of thermoelectric cooler（Ⅱ）

3. Guarantee fixture clamping force, flatness and parallelism
From the reason for generating weld resistance, in order to reduce weld resistance, the size deviation of TEC element should be as small as possible. At the same time, the fixture clamping force should be moderate, the flatness should be less than 0.03mm, and the parallelism should be less than 0.05mm. When soldering, spring pressure should be changed into reed pressure in order to ensure that pressures of two ends are same.

4. Optimizing weld process
During welding, it needs to ensure that temperature field is uniform. After meeting the welding requirements, solder melting time should be reduced as far as possible to decrease thermal shock. In order to reduce the temperature stress caused by shrinkage, cooling curve should be properly optimized.

5. Reducing the amount of solder
Based on meeting the requirements of weld strength and weld resistance, the amount of solder should be reduced as far as possible.

Our company specializes in design and produce TECs, TEC controllers and some other productsrelated TECs. Before our products go into market, they will go through strict design, testing and verification, so you can completely trust us. What’more,we can also customize your TECs based on thermal system.

If you want to know more about thermoelectric cooler, please contact us.
Our web site is http://www.analogtechnologies.com/tec-module.html

How to improve the processing performance of thermoelectric cooler

Thermoelectric cooler (TEC) has two functions: heating and cooling, depending on the direction of input current. It has been widely used in medical, industry, military and some other fields needing to be cooled.

1. Reducing the thickness of the thermal insulating layer
The main method to reduce heat transfer temperature is to decrease the thickness of the thermal insulating layer. Take 12704 type thermopile made of alumina ceramics as an example. If its thickness is reduced from 0.8mm to 0.5mm, its resistance will be decreased by 37%, the cold side temperature difference can drop 0.8°C at most, and the hot side temperature difference can drop 4°C at most. At the same time, the cooling deformation of the electric insulation heat conduction layer and weld resistance can also be reduced

2. Checking the resistance value of elements
A large contact resistance can be formed on the inclined element end, and component internal defect can change the resistance value of the element. Before soldering, the element resistance can be measured by using contact electrode, if there is abnormal element, it will be removed, which can not only reduce the contact resistance, but also improve the consistency of the performance parameters. Therefore, the optimal value and the consistency of thermopile performance can be improved.

If you want to know more, please contact us.
Our web site is http://www.analogtechnologies.com/tec-module.html

Factors affecting the performance of thermoelectric cooler (Ⅱ)

2.Weld resistance

As each of thermoelectric elements weld thermal couple, there are 4 places in the TEC needing to be welded, so there are 4 weld resistances. The weld resistance includes solder resistance and contact resistance. The solder resistance is proportional to the thickness of the solder, and the contact resistance is related to the size error of galvanic elements and welding process. If the size error is big, more solder will fill between the short component and the metal film, so it will generate more contact resistance after welding. If the weld resistance is increased, optimal value coefficient will decline.

3. Heat dissipation exchange

Inside the piles, cool leakage is inevitable, which is divided into radiation leakage and convection cooling. If galvanic elements are arranged more densely, radiation and convection cool leakage will become smaller.

4. Component performances

Reason for the decline of component performance is mainly mechanical damage, thermal shock and copper infiltration. The mechanical damage is produced by the material cutting. After components and conductive metal plates are welded together, copper atoms may penetrate into components, which is called copper infiltration phenomenon. Copper infiltration can lead thermal performance to decline.

If you want to know more, please contact us.
Our web site is http://www.analogtechnologies.com/tec-module.html

Factors affecting the performance of thermoelectric cooler (Ⅰ)

The principle of thermoelectric cooler (TEC) is solid thermoelectric effect. Comparing with other cooling methods, TEC has obviously different cooling effect. This cooling method takes electrons as energy carrier, and because of no need of refrigerant, there is no environmental pollution problem. TEC has no moving parts besides fan, so it has simple structure, small noise, high reliability, long service lifetime and some other advantages. Most of TECs are made of N type and P type thermocouple arms, which are composed of multiple pairs of thermocouples.

Due to the presence of heat transfer temperature difference, weld resistance between cooling element, conductive metal, heat dissipation exchange and so on, the cooling performances of thermocouples can be affected a lot.

1.Additional heat transfer temperature difference

Additional heat transfer temperature difference has the largest influences on the performances of thermopiles. As electric installation heat conduction layer, brazing layer and conductive layer have their own thermal resistance, the cold side temperature is lower than the node temperature of thermocouples and the hot side temperature is higher than that. The actual cold and hot side temperature of thermocouples are: , , where,  and  respectively represent the cold side heat transfer temperature difference and the hot side heat transfer temperature difference. In the same working conditions, with the increase of  and  will reduce and  will increase. So cooling capacity, cooling coefficient and the maximum obtained temperature difference will decline quickly. The electric installation heat conduction layer is made of ceramic or plastic, which has low thermal conductivity and large thickness, so the temperature difference generated by electric installation heat conduction layer is large, about 92% of the total temperature difference.

Some other influence factors will be introduced in the next articles.
If you want to know more, please contact us.
Our web site ishttp://http:/www.analogtechnologies.com/tec-module.html

High Voltage Laser Driver ATLSXA214

Laser driver with high output voltage is capable of driving one or more laser diodes simultaneously. The input voltage can be 5V to 16V, and the output voltage is from 0V to 15V. The laser driver generates ultra low output current noise : < 12µA@0.1Hz~10Hz, with high current stability <±600µA@4A &－20°C~80°C.  
Though this laser driver comes with high efficiency >92%, it doesn't need heat sink to dissipate heat, a small amount of heat.

The laser driver will shut down by itself when the temperature exceeds the temperature limit 120°C. Under shutdown mode, all the parts will stop working, while the input current is reduced to < 3µA. A loop good indication output is used to tell users if this laser driver is working well.

A high modulation speed can be achieved due to the output stage. There is an over current protection circuit in this laser driver, which prevents the laser driver from being damaged by over current. There is also a soft start circuit which allows the laser driver to increase its output current slowly during start up process and shut down the current quickly.

The physical photo of high voltage laser driver ATLS10A214

If you want to know more, please contact us.
For detailed information of laser drivers, please visit us at: http://www.analogtechnologies.com/atlsxa214.html

Laser Driver Control System

Most of high precision constant current sources use integrated operational amplifier. The principle is to make the voltages added to the two input ports of the comparison amplifier are equal by using negative influence, resulting in constant current output there are two factors that affect the stability of the output constant from the constant current sources: one is the inner factor of the constant current source, like voltage reference, sampling resistor, amplifier gain, zero drift, and noise voltage; and the other one is external factor, like input voltage, resistor load, and the ambient temperature change, etc.

Soft start circuit

The diode laser can be damaged due to accident open or close of multiple electronics in the same electric network. The main reason is that there will be a large instantaneous impact current when the switch is opening or closing. This current damages the diode laser. Therefore, the input of laser driver should be soft start circuit, which prevents the laser from being damaged.

Our laser driver has a soft start circuit inside the laser driver, which ensures smooth current transactions during power-up period.

The physical photo of a constant current laser driver

If you want to know more, please contact us.
For detailed information of laser drivers, please visit us at:http://www.analogtechnologies.com/High_Efficiency_AC_Input_Laser_Drivers.html

TEC loss mechanism (Ⅱ)

This article continues to introduce TEC loss mechanism.

(2) Heat conduction loss
In cooling process, heat conduction mainly plays a role of heat change. The pathway of heat conduction is that the cold side absorbs the heat of heat load, which can be transferred to heat sink, so the cold side thermoregulation can be realized. The cooling capacity can directly affect TEC cooling efficiency. What’s more, the size and the cooling method of heat sink are also important factors to affect the cooling efficiency.

(3) Heat radiation loss
Radiant heat exchange capacity between two objects is proportional to four variables of temperature of the two objects. With the decrease of the cold side temperature of TEC, temperature different between the cold side and the hot side will increase, so that the cooling efficiency will be reduced.

Our company specializes in research and development and production of various thermoelectric coolers, such as single-stage TEC, multi-stage TEC, square TEC, circular TEC and so on. Our TECs have high reliability, high stability, long service life time, and some other advantages. We design and make standard off-the-shelf TECs, and we also can customize TECs for meeting customers’ requirements based on thermal system. We believe we can become your one-stop company for designing and producing your TEC-based system.

If you have any questions and suggestions about TEC, please contact us and we are very happy to receive your feedback.
Our web site is http://www.analogtechnologies.com/tec-module.html

TEC loss mechanism (Ⅰ)

Figure 1 is the schematic diagram of thermoelectric cooler (TEC). TEC is made up of N-type semiconductor, P-type semiconductor, cold pate, hot plate and wires.

Figure 1. Schematic diagram of TEC

In working process, TEC continuously absorbs heat from the cold side and release heat from the hot side. TEC has many advantages, such as no moving parts, no refrigerant, no pollution, no noise, high reliability, long service lifetime and so on.

However, it also has some disadvantages. Its biggest weakness is low cooling efficiency, which affects its own applications a lot. Based on TECs, heating or cooling devices need to be mounted heat sinks. Because of small distance between the cold side and the hot side heat sink, heat conduction, heat convection, and heat radiation will make TEC efficiency reduce. Its loss mechanism is as follows:

(1)   Heat convection loss
If air exists between cold side and hot side heat sink, heat convection will be generated. In the cooling process, there is a temperature gradient between the cold side and the hot side, the gas flow and the heat transfer are inevitable, and the cooling capacity is bound to be consumed.

Other loss mechanisms of TECs will be introduced in the next article.
If you want to know more, please contact us.
Our web site is http://www.analogtechnologies.com/tec-module.html

Performance features of NTC thermistor

Thermistors are thermal elements made of semiconductor materials. Resistance value of thermistors can vary with the temperature of resistor bodies. Thermistors can be divided into three types: positive temperature coefficient thermistor (PTC), negative temperature coefficient thermistor (NTC) and critical temperature coefficient thermistor (CRT).

NTC thermistor has the following advantages:
(1)High sensitivity
The absolute value of its temperature coefficient resistance is greater than that of the metal film resistor.
(2)Good stability
(3)Small size
It can be made into various shapes and the minimum size of bead thermistors up to φ0.2mm.
(4)Low power consumption
(5)Low cost

NTC thermistor have a wide measuring range, especially suitable for temperature measurement between -100~300℃. It has been widely used for measuring point temperature, surface temperature, temperature difference, etc. what’s more, it’s also used for automatic control and thermal compensation circuit.

If you want to know more, please contact us.
Our web site is http://www.analogtechnologies.com/thermistor.html

Technical background of thermoelectric technology

A low DC voltage is added on the both sides of thermoelectric cooler (TEC) and heat will flow from one side of the component to the other side. At this time, the temperature on one side of TEC will decrease and the temperature on the other side will increase. It is noteworthy that as long as the current direction is changed, the heat flow direction can be changed. So a TEC can realize two functions, cooling and heating at the same time. TEC can be used for precise temperature control. What’s more, TEC also has the function of power generation. In this mode, if temperature difference is added on TEC, current will be produced in the loop.
The physical photo of TEC

In actual application, semiconductor material mixed by P type and N type semiconductor materials and flow defectors with good conductivity and thermal conductivity are connected in to a single body in series. A TEC is usually made up of one or more pairs of such single body. From the current path, it is a series mode and from the heat flow path, it is a parallel mode.These single bodies and flow defectors are usually mounted between two pieces of ceramic substrates.

If you want to know more, please contact us.
Our web site is http://www.analogtechnologies.com/tec-module.html

High Voltage Laser Driver

Laser driver is an electronic module, which is designed for driving a serial of diode lasers.High voltage laser driver features an input voltage between 4.75V to 16V. this laser driver is of high efficiency, so it generates small amount of heat, thus, there is no need for a heat sink for normal operation.

This laser driver has a wide input and output voltage range and high output current capability. Moreover, it outputs low noise with high efficiency. The wide output voltage range allows driving one or multiple diode lasers simultaneously. The high voltage laser driver generates a high accuracy low noise reference voltage, which is applied for setting the output current

There are three control states, shutdown, standby and operation. The laser driver is packaged in 6-side metal enclosure, which prevents the laser driver and other electronics from interfering each other. Both DIP and SMT packages are available.

The physical photo of a constant current laser driver

This laser driver can be evaluated by our unique evaluation board conveniently. You can find it in our website too.

For different types of laser drivers, we also provide corresponding evaluation boards, which simplifies

If you want to know more, please contact us.
For detailed information of laser drivers, please visit us at:http://www.analogtechnologies.com/high_voltage_constant_current_laser_driver.html

ATEQA2015 household earthquake alarm

ATEQA2015，a household earthquake alarm, is used to measure the earthquake azimuth and it can inform government and people of earthquake as soon as possible. So people can get timely help.

The physical photo of ATEQA2015

Descriptions
1.Alarm mode
Geomagnetism loss alarm, magnetic north and south reverse and longitudinal P wave variation alarm
2.When will it alarm
When over 3 magnitude earthquake, earthmagnetic field will change, for example, magnet will loss, North and South Pole will change or P wave impact will occur, etc. The alarm can sense the above changes and then alarms. If there are no such changes, it will not alarm.
3.How far ahead of time will it alarm
Generally, it can alarm 10 minutes to dozens of seconds in advance.
If you want to know more, please contact us.
Our web site is http://www.analogti.com/ateqa2015.html

A household earthquake alarm

The existing earthquake alarm has complex structure so it is seldom used in family. In recent years, our company has been researching a household earthquake alarm. Finally, a household earth alarm ATEQA2015 with high reliability, simple structure, and compact size releases.

The physical photo of ATEQA2015
This household earthquake has three warning modes: geomagnetism loss alarm, magnetic north and south reverse and longitudinal P wave variation alarm. It can effectively use the time to escape and it is very suitable for places where earthquakes often occur.
Specifications:
Power supply voltage: 100 ~ 240 (VAC)
Alarm response speed: < 20ms
Earthquake source detection radius: 75km
Alarm sound level: 70db
Size: 6.1×4.6×1.2 (inch) 15.5×11.6×3 (cm)
Weight: 8.1 (Oz) 230 (g)  If you want to know more, please contact us.
Our web site is http://www.analogti.com/ateqa2015.html

High Voltage Power module

High voltage power module is a kind of a power supply, which can be directly mounted on circuit boards. Power module can supply power for integrated circuit, digital signal processor, microprocessor, memory and other digital or analog load. Generally, this module is called load point power supply system or point power supply system. Power supply has been widely used for switching equipment, access devices, mobile communication, optical transmission, microwave communication, router and so on.

Our company specializes in design and production of power modules with high quality and performance. High voltage power module ATHV12-6000V is a product of our company, which is a power supply module of DC-DC low voltage conversion. It can be used for industrial measurement and control, energy spectrum analysis, medical instrument and environmental monitoring.

The physical photo of LSL957 high voltage power supply

Technical parameters:
Input voltage: 12V±1V
Input voltage and current: 0~+6000V/1mA
Output voltage stability: ≤0.02%
Adjustment mode: 0~5V of 10K POT
Applicable temperature: -20~+50℃
Output mode: lead
Output and input: common ground
If you want to know more, please contact us.
Our web site is:
http://www.analogtechnologies.com/High_Voltage_Power_Supply.html