OPA739GD

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OPA739GD is a generation of digital-control low-voltage constant-current ICs developed by Texas Instruments. It has been widely used in the fields of digitalLED lighting, continuous current control and industrial automation. In addition, in order to meet the needs of most applications, the OPA739GD supports built-in adaptive backlight dimming, and also has a working frequency electric adjustment (FSA) operation ability.

OPA739GD has excellent performance as an LED lighting chip. It has high accuracy, wide operating voltage range (2.2V to 25V), low quiescent current under operating voltage (21uA), and 0.87V dropout voltage (at 25mA). Moreover, OPA739GD can provide a constant current range of 1mA to 25mA, which is suitable for driving small to medium LEDs.

OPA739GD can support digital lighting systems such as COBs (Chip on Board) and LED engines. In COBs or LED engines, the OPA739GD IC can be used to provide constant current for LED string to ensure uniform dimming and work in harsh environments. In addition, the OPA739GD can also be used in LED modules. Digital LED modules are used in displays, signs and lighting products, with various features such as hPWM dimming, LED color control, and LED protection.

The working principle of OPA739GD is a kind of PID control concept. So-called PID is a pole insert differential automatic control system technology is widely used in industrial control. It consists of three components: proportional (P), integral (I) and linear differential components (D). The P component is responsible for system\'s proportional correction, which is to obtain the proportional proportion between the electronic signal output and the physical quantity; the I component is responsible for the saturation accumulation and system\'s speed constant expansion; the D component works with the selected time delay to obtain the system\'s transition time, which can be called the object of acceleration. The PID component uses the difference between the current and the expected values to adjust the system response to achieve the desired effect.

In order to achieve a high level of accuracy, the OPA739GD IC can use feedback resistors to measure the LED output current and then use the PID loop to adjust the output current dynamically based on the set value of current. In this way, the users can adjust the current as needed and obtain a stable, precise and reliable output current.

In summary, OPA739GD is an advanced digital constant-current control IC suitable for small to medium LED lighting applications. It provides excellent accuracy, wide operating voltage range, and low quiescent current. It can be used in COBs and LED engines for achieving uniform dimming and protecting the LEDs from harsh environments, as well as in LED modules for displays, signs and lighting. The working principle of OPA739GD is based on PID control concept, which can adjust the output current dynamically, meeting the needs of most applications.

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