WP1503GD

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LED indicators or discrete LED’s are a popular way to provide visual indication of an event or process, often found in industrial and automotive applications. The WP1503GD is an important component for LED indication, as it maximizes current and dissipates heat, resulting in optimal operation of the LED. This paper will discuss the application field and working principle of the WP1503GD.

Application Field

The WP1503GD is designed to reliably interface directly with 1.2V red/green/yellow and blue LEDs. When used alone the WP1503GD can provide up to 150mA of current to the selected LED, allowing a brighter display than many other discrete LED indicators. As a result, it is ideal for high brightness applications such as signs, displays, and night illumination. The WP1503GD is also extremely efficient, with a 5V to 1.2V power drop so that less current is required for the same brightness. This helps to reduce system cost, power consumption, and heat.

The WP1503GD has a wide temperature range and is tested and validated in automotive environments. As a result, it is commonly found in automotive applications such as dashboards, turn signals, hazard lights, and interior lighting. The WP1503GD has also been used in consumer appliances such as washing machines, dishwashers, and refrigerators.

Working Principle

The WP1503GD is a highly efficient monolithic switching DC/DC converter integrated circuit that maximizes current and dissipates heat. The WP1503GD can switch from 5V input to a low 1.2V output voltage. The WP1503GD employs a push/pull topology to drive the LEDs with up to 150mA of current at a specified 1.2V output voltage. The WP1503GD has an internal under-voltage lockout function, which will shut down the output when the input voltage is too low to guarantee a specified output voltage.

The WP1503GD also features a built-in soft-start function to eliminate inrush current. When the IC is first powered, the softstart will slowly increase the voltage to its optimum value over a few microseconds. This helps to reduce the peak current, prevent damage to the LED, and match the voltage requirements of the supply.

The WP1503GD is designed to operate in a temperature range between -40°C and +85°C. This ensures that the IC can operate reliably even in extreme hot or cold conditions. Furthermore, the WP1503GD is constructed with a radiation hardening package to ensure reliable operation in locations with high levels of radiation.

The WP1503GD is an ideal component for LED indications and is well suited for many different applications. Its efficiency, wide temperature range, current control, and radiation hardness make it an excellent choice for industrial, automotive, and consumer applications.

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